SIMCom SIM7600X Hardware Design

SIM7600 Series

Hardware Design

LTE Module

SIMCom Wireless Solutions Limited

Building 3, No.289, LinHong Road

Changning District, Shanghai P.R.China

Tel: 86-21-31575100 [email protected]

www.simcom.com

SIM7600 Series Hardware Design V1.08

Document Title:

Version:

Date:

Status:

SIM7600 Series Hardware Design

V1.08

202 1 -08-13

Released

GENERAL NOTES

SIMCOM OFFERS THIS INFORMATION AS A SERVICE TO ITS CUSTOMERS, TO SUPPORT

APPLICATION AND ENGINEERING EFFORTS THAT USE THE PRODUCTS DESIGNED BY SIMCOM.

THE INFORMATION PROVIDED IS BASED UPON REQUIREMENTS SPECIFICALLY PROVIDED TO

SIMCOM BY THE CUSTOMERS. SIMCOM HAS NOT UNDERTAKEN ANY INDEPENDENT SEARCH

FOR ADDITIONAL RELEVANT INFORMATION, INCLUDING ANY INFORMATION THAT MAY BE IN THE

CUSTOMER’S POSSESSION. FURTHERMORE, SYSTEM VALIDATION OF THIS PRODUCT

DESIGNED BY SIMCOM WITHIN A LARGER ELECTRONIC SYSTEM REMAINS THE RESPONSIBILITY

OF THE CUSTOMER OR THE CUSTOMER’S SYSTEM INTEGRATOR. ALL SPECIFICATIONS

SUPPLIED HEREIN ARE SUBJECT TO CHANGE.

COPYRIGHT

THIS DOCUMENT CONTAINS PROPRIETARY TECHNICAL INFORMATION WHICH IS THE PROPERTY

OF SIMCOM WIRELESS SOLUTIONS LIMITED COPYING, TO OTHERS AND USING THIS DOCUMENT,

ARE FORBIDDEN WITHOUT EXPRESS AUTHORITY BY SIMCOM. OFFENDERS ARE LIABLE TO THE

PAYMENT OF INDEMNIFICATIONS. ALL RIGHTS RESERVED BY SIMCOM IN THE PROPRIETARY

TECHNICAL INFORMATION ， INCLUDING BUT NOT LIMITED TO REGISTRATION GRANTING OF A

PATENT , A UTILITY MODEL OR DESIGN. ALL SPECIFICATION SUPPLIED HEREIN ARE SUBJECT TO

CHANGE WITHOUT NOTICE AT ANY TIME.

SIMCom Wireless Solutions Limited

Building 3, No.289, LinHong Road

, Changning District, Shanghai P.R.China

Tel: +86 21 31575100

Email: [email protected]

For more information, please visit: https://www.simcom.com/download/list-863-en.html

For technical support, or to report documentation errors, please visit: https://www.simcom.com/ask/ or email to: [email protected]

Copyright © 2020 SIMCom Wireless Solutions Limited All Rights Reserved.

www.simcom.com

2 / 74

SIM7600 Series Hardware Design V1.08

Version History

Date

2017-10-11

2017-11-23

2018-4-11

2019-4-30

2019-11-22

2019-12-03

2020-3-19

2020-5-06

2021-8-13

Version Description of change

1.00

Original

1.01

V1.02

V1.03

V1.04

V1.05

V1.06

V1.07

V1.08

Modify Table2, Table15, Table 8, Table16, Table21,

Table 26

Modify Figure 4, Figure 10

Modify 3.13.3 LDO output voltage 2.85V by default.

Rename VDD_EXT to VDD_AUX

Modify table 1,2,5,15,22,34

Modify figure 4,36,37

Modify the document name

Update table 8;

Update table 10;

Update table 30;

Correct the figure 11;

Add recommend SMT stencil;

Update document templet

Update some parameters

Update figure 2;

Update reset timing diagram and reset timing parameters

Author

Ma Hong Gang

Gao Fan

Gao Fan

Yuan Shi Jie

Yuan Shi Jie

Gao Fan

Ma Hong Gang

Ma Hong gang

Ma Hong gang

Ma Hong gang

Gan Wen Ke

Ma Hong gang

Liu Wang Rong www.simcom.com

3 / 74

SIM7600 Series Hardware Design V1.08

Contents

Table Index

.............................................................................................................................................

6

Figure Index

...........................................................................................................................................

7

1 Introduction

....................................................................................................................................

8

1.1

Product Outline ............................................................................................................................................

8

1.2

Hardware Interface Overview ...................................................................................................................

9

1.3

Hardware Block Diagram ...........................................................................................................................

9

1.4

Functional Overview .................................................................................................................................

10

2 Package Information

..................................................................................................................

13

2.1

Pin Assignment Overview ........................................................................................................................

13

2.2

Pin Description ..........................................................................................................................................

15

2.3

Mechanical Information ............................................................................................................................

19

2.4

Footprint Recommendation .....................................................................................................................

20

3 Interface Application

..................................................................................................................

21

3.1

Power Supply .............................................................................................................................................

21

3.1.1

Power Supply Design Guide .......................................................................................................

22

3.1.2

Recommended Power Supply Circuit .......................................................................................

23

3.1.3

Voltage Monitor .............................................................................................................................

24

3.2

Power on/Power off/Reset Function ......................................................................................................

24

3.2.1

Power on ........................................................................................................................................

24

3.2.2

Power off ........................................................................................................................................

26

3.2.3

Reset Function ..............................................................................................................................

27

3.3

UART Interface ..........................................................................................................................................

29

3.3.1

UART Design Guide .....................................................................................................................

29

3.3.2

RI and DTR Behavior ...................................................................................................................

31

3.4

USB Interface ............................................................................................................................................

32

3.4.1

USB diagram .................................................................................................................................

32

3.4.2

USB_BOOT ...................................................................................................................................

32

3.4.3

USB_ID ...........................................................................................................................................

33

3.5

USIM Interface ...........................................................................................................................................

34

3.5.1

USIM Application Guide ...............................................................................................................

35

3.5.2

USIM Design Notice .....................................................................................................................

36

3.5.3

Recommended USIM Card Holder ............................................................................................

36

3.6

PCM Interface ............................................................................................................................................

37

3.6.1

PCM timing ....................................................................................................................................

38

3.6.2

PCM Application Guide ................................................................................................................

40

3.7

SD Interface ...............................................................................................................................................

40

3.8

I2C Interface ..............................................................................................................................................

41

3.9

SDIO Interface ...........................................................................................................................................

42

3.10 SPI Interface ..............................................................................................................................................

42

3.11 Network Status ..........................................................................................................................................

42

3.12 Flight Mode Control ..................................................................................................................................

43

3.13 HSIC Interface ...........................................................................................................................................

44

3.14 GPIO Interface ...........................................................................................................................................

44

3.15 Other Interface ...........................................................................................................................................

45

3.15.1 Sink Current Source .....................................................................................................................

45

3.15.2 ADC .................................................................................................................................................

46

3.15.3 LDO .................................................................................................................................................

46

4 RF Specifications

........................................................................................................................

48

4.1

GSM/UMTS/LTE RF Specifications .......................................................................................................

48

4.2

GSM /UMTS/LTE Antenna Design Guide .............................................................................................

51

www.simcom.com

4 / 74

SIM7600 Series Hardware Design V1.08

4.3

GNSS ..........................................................................................................................................................

52

4.3.1

GNSS Technical specification .....................................................................................................

52

4.3.2

GNSS Application Guide .............................................................................................................

53

5 Electrical Specifications

...........................................................................................................

55

5.1

Absolute maximum ratings ......................................................................................................................

55

5.2

Operating conditions ................................................................................................................................

55

5.3

Operating Mode ........................................................................................................................................

56

5.3.1

Operating Mode Definition ..........................................................................................................

56

5.3.2

Sleep mode ....................................................................................................................................

57

5.3.3

Minimum functionality mode and Flight mode .........................................................................

57

5.4

Current Consumption ...............................................................................................................................

58

5.5

ESD Notes .................................................................................................................................................

60

6 SMT Production Guide

..............................................................................................................

61

6.1

Top and Bottom View of Module .............................................................................................................

61

6.2

Label Information ......................................................................................................................................

61

6.3

Typical SMT Reflow Profile .....................................................................................................................

62

6.4

Moisture Sensitivity Level (MSL) ............................................................................................................

62

6.5

Recommend dimensions of SMT stencil ..............................................................................................

63

6.6

Stencil Foil Design Recommendation ...................................................................................................

64

7 Packaging

.....................................................................................................................................

65

8 Appendix

.......................................................................................................................................

67

8.1

Reference Design .....................................................................................................................................

67

8.2

Coding Schemes and Maximum Net Data Rates over Air Interface ................................................

68

8.3

Related Documents ..................................................................................................................................

70

8.4

Terms and Abbreviations .........................................................................................................................

72

8.5

Safety Caution ...........................................................................................................................................

74

www.simcom.com

5 / 74

SIM7600 Series Hardware Design V1.08

Table Index

Table 1: Module frequency bands(* Stand for SIM7600) ...............................................................................................................8

Table 2: General features ..................................................................................................................................................................10

Table 3: Pin definition ........................................................................................................................................................................ 14

Table 4: IO parameters definition .....................................................................................................................................................15

Table 5: Pin description ..................................................................................................................................................................... 15

Table 6: VBAT pins electronic characteristic ..................................................................................................................................21

Table 7: Recommended TVS list ..................................................................................................................................................... 23

Table 8: Power on timing and electronic characteristic ................................................................................................................25

Table 9: Power off timing and electronic characteristic ................................................................................................................ 26

Table 10: Reset timing parameters ..................................................................................................................................................28

Table 11: USB_BOOT description ................................................................................................................................................... 32

Table 12: USB_ID description .......................................................................................................................................................... 34

Table 13: USIM electronic characteristic in 1.8V mode (USIM_VDD=1.8V) .............................................................................34

Table 14: USIM electronic characteristic 3.0V mode (USIM_VDD=2.95V) ...............................................................................35

Table 15: Amphenol USIM socket pin description .........................................................................................................................37

Table 16: PCM format ........................................................................................................................................................................37

Table 17: PCM timing parameters (2G/3G mode) ........................................................................................................................ 39

Table 18: PCM timing parameters (4G mode) ...............................................................................................................................39

Table 19: MMC/SD electronic characteristic (SD_DATA0-SD_DATA3 ， SD_CLK and SD_CMD) * .....................................40

Table 20: NETLIGHT pin status ....................................................................................................................................................... 43

Table 21: FLIGHTMODE pin status .................................................................................................................................................43

Table 22: Key differences between HSIC and USB ......................................................................................................................44

Table 23: WIFI/BT Version GPIO .....................................................................................................................................................45

Table 24:Standard version GPIO .....................................................................................................................................................45

Table 25: Sink current electronic characteristic .............................................................................................................................45

Table 26: ADC1 and ADC2 electronic characteristics .................................................................................................................. 46

Table 27: Electronic characteristic ...................................................................................................................................................47

Table 28: Conducted transmission power ...................................................................................................................................... 48

Table 29: Operating frequencies ......................................................................................................................................................49

Table 30: E-UTRA operating bands .................................................................................................................................................49

Table 31: Conducted receive sensitivity ......................................................................................................................................... 50

Table 32: Reference sensitivity (QPSK) ......................................................................................................................................... 50

Table 33: Trace loss ...........................................................................................................................................................................51

Table 34: Recommended TVS ......................................................................................................................................................... 52

Table 35: Recommended Passive Antenna Characteristics ........................................................................................................53

Table 36: Recommended LNA and SAW Filter ............................................................................................................................. 54

Table 37: Absolute maximum ratings .............................................................................................................................................. 55

Table 38: Recommended operating ratings ...................................................................................................................................55

Table 39: 1.8V Digital I/O characteristics* ......................................................................................................................................55

Table 40: Operating temperature .....................................................................................................................................................56

Table 41: Operating mode Definition ...............................................................................................................................................56

Table 42: Current consumption on VBAT Pins (VBAT=3.8V) ......................................................................................................58

Table 43: The ESD performance measurement table (Temperature: 25 ℃ , Humidity: 45%) ................................................. 60

Table 44: The description of label information ...............................................................................................................................62

Table 45: Moisture Sensitivity Level and Floor Life ...................................................................................................................... 63

Table 46: Tray size ............................................................................................................................................................................. 66

Table 47: Small Carton size ..............................................................................................................................................................66

Table 48: Big Carton size ..................................................................................................................................................................66

Table 49: Coding Schemes and Maximum Net Data Rates over Air Interface .........................................................................68

Table 50: Related Documents ..........................................................................................................................................................70

Table 51: Terms and Abbreviations ................................................................................................................................................. 72

Table 52: Safety Caution ...................................................................................................................................................................74

www.simcom.com

6 / 74

SIM7600 Series Hardware Design V1.08

Figure Index

Figure 1: Module block diagram ...................................................................................................................................................... 10

Figure 2: Pin assignment overview ................................................................................................................................................. 13

Figure 3: Dimensions (Unit: mm) .....................................................................................................................................................19

Figure 4: Footprint recommendation (Unit: mm) ........................................................................................................................... 20

Figure 5: VBAT voltage drop during burst emission (GSM/GPRS) ............................................................................................21

Figure 6: Power supply application circuit ......................................................................................................................................22

Figure 7: Linear regulator reference circuit ....................................................................................................................................23

Figure 8: Switching mode power supply reference circuit ...........................................................................................................23

Figure 9: Reference power on/off circuit ........................................................................................................................................ 24

Figure 10: Power on timing sequence ............................................................................................................................................ 25

Figure 11: Power off timing sequence .............................................................................................................................................26

Figure 12: Reference reset circuit ................................................................................................................................................... 27

Figure 13: Reset timing sequence ...................................................................................................................................................28

Figure 14: UART full modem ............................................................................................................................................................29

Figure 15: UART null modem ...........................................................................................................................................................29

Figure 16: Reference circuit of level shift ....................................................................................................................................... 30

Figure 17: Level matching circuit with triode ..................................................................................................................................30

Figure 18: RI behaviour （ SMS and URC report ） .......................................................................................................................31

Figure 19: RI behaviour （ voice call ） ............................................................................................................................................ 31

Figure 20: USB reference circuit ......................................................................................................................................................32

Figure 21: USB_BOOT circuit .......................................................................................................................................................... 33

Figure 22: Force download port .......................................................................................................................................................33

Figure 23: USB_OTG diagram .........................................................................................................................................................34

Figure 24: USIM interface reference circuit ................................................................................................................................... 35

Figure 25: USIM interface reference circuit with USIM_DET ......................................................................................................36

Figure 26: Amphenol SIM card socket ............................................................................................................................................37

Figure 27: PCM_SYNC timing ......................................................................................................................................................... 38

Figure 28: EXT codec to module timing ......................................................................................................................................... 38

Figure 29: Module to EXT codec timing ......................................................................................................................................... 38

Figure 30: Audio codec reference circuit ........................................................................................................................................40

Figure 31: SD reference circuit ........................................................................................................................................................ 41

Figure 32: I2C reference circuit ........................................................................................................................................................41

Figure 33: NETLIGHT reference circuit .......................................................................................................................................... 42

Figure 34: Flight mode switch reference circuit .............................................................................................................................43

Figure 35: ISINK reference circuit ................................................................................................................................................... 46

Figure 36: Antenna matching circuit (MAIN_ANT) ........................................................................................................................51

Figure 37: Antenna matching circuit (AUX_ANT) ..........................................................................................................................52

Figure 38: Active antenna circuit ......................................................................................................................................................53

Figure 39: Passive antenna circuit (Default) ..................................................................................................................................54

Figure 40: Top and bottom view of module .................................................................................................................................... 61

Figure 41: Label information .............................................................................................................................................................61

Figure 42: The ramp-soak-spike reflow profile of module ........................................................................................................... 62

Figure 43: Recommend SMT stencil ...............................................................................................................................................63

Figure 44: packaging diagram ..........................................................................................................................................................65

Figure 45: Tray drawing .................................................................................................................................................................... 65

Figure 46: Small carton drawing ......................................................................................................................................................66

Figure 47: Big carton drawing .......................................................................................................................................................... 66

Figure 48: Reference design ............................................................................................................................................................67

www.simcom.com

7 / 74

SIM7600 Series Hardware Design V1.08

1 Introduction

This document describes the electronic specifications, RF specifications, interfaces, mechanical characteristics and testing results of the SIMCom module. With the help of this document and other software application notes/user guides, users can understand and use module to design and develop applications quickly.

1.1 Product Outline

Aimed at the global market, the module support GSM, WCDMA, LTE-TDD and LTE-FDD. Users can choose the module according to the wireless network configuration. The supported radio frequency bands are described in the following table.

Table 1: Module frequency bands(* Stand for SIM7600)

*A *A-H *V-H *E *E-H Standard Frequency

850MHz

GSM

900MHz

1800M Hz

WCDMA

1900M Hz

B1

B2

B5

LTE

B8

FDD B1

FDD B2

FDD B3

FDD B4

FDD B5

FDD B7

FDD B8

FDD B12

FDD B13

FDD B18

FDD B19

FDD B20

FDD B26

√

√

√

√

√

√

√

√

√

√

√

√

√

√

√

√

√

√

√

√

√

√

√

√

√

√

√

√

√

√

√

√

√

√

√

√ www.simcom.com

*JC-H

√

√

√

√

√

√

√

√

√

√

√

√

√

√

√

√

√

√

*SA

√

√

√

√

√

√

√

√

√

√

√

√

√

√

√

*SA-H

√

√

√

*E-L1C *E-H1C

√

√

√

√

√

√

√

√

√

√

√

√

√

√

√

√

√

√

√

8 /

√

74

SIM7600 Series Hardware Design V1.08

Category

FDD B28

TDD B38

TDD B40

TDD B41

CAT1

√ √

CAT4 CAT4

√

√

√

CAT1

√

√

√

CAT4 CAT4

√ √

CAT1 CAT4 CAT1

√

√

√

CAT4

With a small physical dimension of 30*30*2.9 mm and with the functions integrated, the module can meet almost any space requirement in users’ applications, such as smart phone, PDA, industrial handhold, machine-to-machine and vehicle application, etc.

1.2 Hardware Interface Overview

The interfaces are described in detail in the next chapters include:

 Power Supply

 USB Interface

 UART Interface

 MMC/SD Interface

 SDIO Interface

 USIM Interface

 GPIO

 ADC

 LDO Power Output

 Current Sink Source

 PCM Interface

 SPI Interface

 I2C Interface

1.3 Hardware Block Diagram

The block diagram of the module is shown in the figure below.

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9 / 74

SIM7600 Series Hardware Design V1.08

Figure 1: Module block diagram

1.4 Functional Overview

Table 2: General features

Feature

Power supply

Power saving

Radio frequency bands

Transmitting power

Implementation

Single supply voltage 3.4

～ 4.2V

， recommend 3.8V.

Current in sleep mode : <5mA

Please refer to the table 1

GSM/GPRS power class:

--GSM850: 4 (2W)

--EGSM900: 4 (2W)

--DCS1800: 1 (1W)

--PCS1900: 1 (1W)

EDGE power class:

--GSM850: E2 (0.5W)

--EGSM900: E2 (0.5W)

--DCS1800: E1 (0.4W)

--PCS1900: E1 (0.4W) www.simcom.com

10 / 74

Data Transmission

Throughput

Antenna

GNSS

SMS

USIM interface

USIM application toolkit

Phonebook management

Audio feature

UART interface

MMC/SD

SDIO

USB

Firmware upgrade

Physical characteristics

Temperature range

SIM7600 Series Hardware Design V1.08

UMTS power class:

--WCDMA :3 (0.25W)

LTE power class: 3 (0.25W)

GPRS multi-slot class 12

EDGE multi-slot class 12

UMTS R99 speed: 384 kbps DL/UL

HSPA+: 5.76 Mbps(UL), 42 Mbps(DL)

HSDPA/HSUPA: 2.2 Mbps(UL), 2.8 Mbps(DL)

LTE CAT 1: 10 Mbps(DL)

5 Mbps(UL)

LTE-FDD CAT4 ： 150 Mbps (DL) ， 50 Mbps (UL)

LTE-TDD CAT4 ： 130 Mbps (DL) ， 35 Mbps (UL)

GSM/UMTS/LTE main antenna.

UMTS/LTE auxiliary antenna

GNSS antenna

GNSS engine (GPS,GLONASS and BD)

Protocol: NMEA

MT, MO, CB, Text and PDU mode

SMS storage: USIM card or ME(default)

Transmission of SMS alternatively over CS or PS.

Support identity card: 1.8V/ 3V

Support SAT class 3, GSM 11.14 Release 98

Support USAT

Support phonebook types: DC,MC,RC,SM,ME,FD,ON,LD,EN

Support PCM interface

Only support PCM master mode and short frame sync, 16-bit linear data formats

A full modem serial port by default

Baud rate: 300bps to 4Mbps(default:115200bps)

Baud rate: 9600,19200,38400,57600,115200bps

Can be used as the AT commands or data stream channel

Support RTS/CTS hardware handshake

Multiplex ability according to GSM 07.10 Multiplexer Protocol

Support MMC and SD cards with 2.85 V on SD port

Support SDIO with 1.8 V only on SDIO port

USB 2.0 high speed interface

Firmware upgrade over USB interface or FOTA

Size:30*30*2.9m

Weight:5.7 g

Normal operation temperature: -30°C to +80°C

Extended operation temperature: -40°C to +85°C*

Storage temperature -45°C to +90°C www.simcom.com

11 / 74

SIM7600 Series Hardware Design V1.08

NOTE

Module is able to make and receive voice calls, data calls, SMS and make GPRS/UMTS/HSPA+/LTE traffic in -40 ℃ ~ +85 ℃ . The performance will be reduced slightly from the 3GPP specifications if the temperature is outside the normal operating temperature range and still within the extreme operating temperature range.

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12 / 74

SIM7600 Series Hardware Design V1.08

2 Package Information

2.1 Pin Assignment Overview

All functions of the module will be provided through 87 pads that will be connected to the customers’ platform. The following Figure is a high-level view of the pin assignment of the module.

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Figure 2: Pin assignment overview

13 / 74

Table 3: Pin definition

Pin No.

1

15

17

19

21

7

9

3

5

11

13

47

49

51

53

39

41

43

45

31

33

35

37

23

25

27

29

63

65

67

69

55

57

59

61

71

73

Pin name

GND

PWRKEY

GND

SPI_MISO

SPI_CS

USB_VBUS

USB_DP

VDD_1V8

USIM_DATA

USIM_CLK

SD_CMD

SD_DATA1

SD_DATA3

SDIO_DATA1

SDIO_CMD

SDIO_DATA3

GPIO3

HSIC_STROBE

GND

VBAT

GND

GND

ISINK

ADC1

STATUS

NETLIGHT

USIM_DET

SCL

GND

AUX_ANT

GND

VBAT

GND

CTS

RI

TXD

PCM_OUT www.simcom.com

SIM7600 Series Hardware Design V1.08

Pin name

GND

RESET

SPI_CLK

SPI_MOSI

GND

USB_DN

GND

USB_ID

USIM_RST

USIM_VDD

SD_DATA0

SDA

GND

GND

VBAT

GND

RTS

RXD

DCD

DTR

PCM_IN

SD_DATA2

SD_CLK

SDIO_DATA2

SDIO_DATA0

SDIO_CLK

GPIO6

HSIC_DATA

VBAT

GND

NC (RESERVED)

VDD_AUX

ADC2

SD_DET

GPIO43●

GPIO41●

FLIGHTMODE

Pin No.

2

16

18

20

22

4

6

8

10

12

14

48

50

52

54

40

42

44

46

32

34

36

38

24

26

28

30

64

66

68

70

56

58

60

62

72

74

14 / 74

83

85

87

75

77

79

81

PCM_SYNC

GND

GNSS_ANT

GND

COEX1●

USB_BOOT●

GPIO77

76

78

80

82

84

86

SIM7600 Series Hardware Design V1.08

PCM_CLK●

GND

GND

MAIN_ANT

COEX2

COEX3●

Before the normal power the marked pins with ● cannot be pulled up, otherwise module will not be powered up normally.

2.2 Pin Description

Table 4: IO parameters definition

Pin type Description

PI Power input

PO

AI

AIO

I/O

DI

DO

DOH

DOL

PU

PD

Power output

Analog input

Analog input/output

Bidirectional input /output

Digital input

Digital output

Digital output with high level

Digital output with low level

Pull up

Pull down

Table 5: Pin description

Pin name

Power supply

VBAT

VDD_AUX www.simcom.com

Pin No

38,39, 62,63 PI

44

Default status

Description

PO

Comment

Power supply, voltage range: 3.4

～ 4.2V.

LDO power output for other external circuits with Max 150mA current output. Its output voltage

If unused, keep it open.

15 / 74

VDD_1V8 15 PO

GND

System Control

PWRKEY

1,2,5,

10,14,37,40,4

1,43,57,58,60

,61,64,65,77,

78,80,81

3 DI,PU

RESET

SD interface

SD_CMD

SD_DATA0

SD_DATA1

SD_DATA2

SD_DATA3

SD_CLK

USIM interface

4

21

22

23

24

25

26

DI, PU

DO

I/O

I/O

I/O

I/O

DO

USIM_DATA

USIM_RST

USIM_CLK

USIM_VDD

SPI interface

SPI_CLK

SPI_MISO

SPI_MOSI

SPI_CS

USB interface

USB_VBUS www.simcom.com

17

18

19

20

8

9

6

7

11

SIM7600 Series Hardware Design V1.08

is 2.85V by default.

（ The voltage can be configured from 1.7V to 3.05V by AT command ） .

1.8 output with Max 50mA current output for external circuit, such as level shift circuit.

If unused, keep it open.

Ground

DO

DI

DO

DO

DI,PD

I/O,PU

DO

DO

PO

System power on/off control input, active low.

System reset control input, active low.

The high voltage is 0.8V;

RESET has been pulled up to 1.8V via 40Kohm resistor internally.

SDIO command

SDIO data

SIM7600A,SIM7600A-H and SIM7600V-H do not support SD card. If unused, keep them open.

SDIO clock

USIM Card data I/O, which has been pulled up via a 10KR resistor to

USIM_VDD internally. Do not pull it up or down externally.

USIM Reset

USIM clock

Power output for USIM card, its output Voltage depends on USIM card type automatically. Its output current is up to

50mA.

SPI clock output

SPI master in/slave out data

SPI master out/slave in data

SPI chip-select output

Valid USB detection input with 3.0~5.25V detection

16 / 74

USB_DN 12

USB_DP 13

USB_ID

UART interface

RTS

CTS

RXD

RI

DCD

TXD

DTR

I2C interface

SCL

SDA

SDIO interface

SDIO_DATA1

SDIO_DATA2

SDIO_CMD

SDIO_DATA0

SDIO_DATA3

SDIO_CLK

HSIC interface

HSIC_STROBE

16

70

71

72

66

67

68

69

55

56

27

28

29

30

31

32

35

36 HSIC_DATA

PCM interface

PCM_OUT

PCM_IN

PCM_SYNC

PCM_CLK

GPIO

NETLIGHT 51

73

74

75

76

FLIGHTMODE 54

STATUS www.simcom.com

49

DO

DI

DO

DO

DO

DI,PU

I/O

I/O

I/O

DO

I/O

I/O

DO

I/O

I/O

I/O

DI

DOL

DI,PU

DI,PU

DOH

DOH

DOH

DI,PU

DO

I/O

DO

SIM7600 Series Hardware Design V1.08

voltage

Negative line of the differential, bi-directional

USB signal.

Positive line of the differential, bi-directional

USB signal.

High-speed USB ID input Keep it open.

Request to send

Clear to Send

Receive Data

Ring Indicator

Carrier detects

Transmit Data

DTE get ready

I2C clock output

I2C data input/output

SDIO data1

SDIO data2

SDIO command

SDIO data0

SDIO data3

SDIO clock

HSIC strobe wakeup

HSIC data

If use, please refer to document [27]

Otherwise please keep them open.

PCM data output.

PCM data input.

PCM data frame sync signal.

PCM data bit clock.

If unused, please keep them open.

LED control output as network status indication.

Flight Mode control input.

High level(or open):

Normal Mode

Low level: Flight Mode

Operating status output.

High level: Power on and firmware ready

Low level: Power off

If unused, keep them open.

DO NOT PULL UP

GPIO43 DURING

NORMAL POWER UP!

17 / 74

GPIO41

GPIO43

GPIO3

GPIO6

SD_DET

USIM_DET 53

GPIO77

RF interface

MAIN _ANT

GNSS_ANT

87

AUX_ANT

Other interface

ISINK

59

45

82

79

ADC1

ADC2

COEX1

COEX2

COEX3

47

46

83

84

86

USB_BOOT

NC

85

42

52

50

33

34

48

PI

AI

AI

I/O

I/O

I/O

IO

IO

IO

IO

IO

IO

IO

AIO

AI

AI

DI,PD

SIM7600 Series Hardware Design V1.08

GPIO

GPIO

GPIO

GPIO

Default: GPIO

Optional: SD card detecting input.

H: SD card is removed

L: SD card is inserted

Default: GPIO

Optional: USIM card detecting input.

H: USIM is removed

L: USIM is inserted

GPIO

MAIN antenna soldering pad

GNSS antenna soldering pad

Auxiliary soldering pad antenna

Ground-referenced current sink.

Analog-digital converter input 1

Analog-digital converter input 2

RF synchronizing between Wi-Fi and LTE.

If unused, please keep them open.

Boot configuration input.

Module will be forced into

USB download mode by connect 85 pin to

VDD_1V8 during power up.

No connection.

If unused, keep them open.

DO NOT PULL UP

COEX1 AND COEX3

DURING NORMAL

POWER UP!

Do place 2 test points for debug.

DO NOT PULL UP

USB_BOOT DURING

NORMAL POWER UP!

Keep it open www.simcom.com

18 / 74

SIM7600 Series Hardware Design V1.08

2.3 Mechanical Information

The following figure shows the package outline drawing of module.

www.simcom.com

Figure 3: Dimensions (Unit: mm)

19 / 74

2.4 Footprint Recommendation

SIM7600 Series Hardware Design V1.08

Figure 4: Footprint recommendation (Unit: mm) www.simcom.com

20 / 74

SIM7600 Series Hardware Design V1.08

3 Interface Application

3.1 Power Supply

The power supply pins of module include 4 pins (pin 62&63, pin 38&39) named VBAT.

The 4 VBAT pads supply the power to RF and baseband circuits directly. On VBAT pads, the ripple current up to 2A typically, due to GSM/GPRS emission burst (every 4.615ms), may cause voltage drop. So the power supply for these pads must be able to provide sufficient current up to more than 2A in order to avoid the voltage drop is more than 300mV.

The following figure shows the VBAT voltage ripple wave at the maximum power transmit phase.

Figure 5: VBAT voltage drop during burst emission (GSM/GPRS)

The test condition: The voltage of power supply for VBAT is 3.8V, Cd=100 µF tantalum capacitor

(ESR=0.7Ω) and Cf=100nF (Please refer to Figure 6—Application circuit).

Table 6: VBAT pins electronic characteristic

Symbol

VBAT

I

VBAT(peak)

I

VBAT(average)

I

VBAT (sleep)

I

VBAT (power-off)

Description

Module power voltage

Module power peak current in normal mode.

Module power average current in normal mode

Power supply current in sleep mode

Module power current in power off mode.

Min. Typ. Max. Unit

3.4

3.8

4.2

V

2 A

Please refer to the table 34

20 uA

www.simcom.com

21 / 74

SIM7600 Series Hardware Design V1.08

3.1.1

Power Supply Design Guide

Make sure that the voltage on the VBAT pins will never drop below 3.4V, even during a transmit burst, when current consumption may rise up to 2A. If the voltage drops below 3.4V, the RF performance may be affected.

If the power supply for VBAT pins can support up to 2A, more than 300uF capacitors are recommended. Otherwise users must use a total of 1000uF capacitors typically, in order to avoid of the voltage drop more than 300mV.

Some multi-layer ceramic chip (MLCC) capacitors (0.1/1uF) with low ESR in high frequency band can be used for EMC.

These capacitors should be put as close as possible to VBAT pads. Also, users should keep VBAT trace on circuit board wider than 2 mm to minimize PCB trace impedance. The following figure shows the recommended circuit. Recommend part of FB101 is BLM21PG300SN1D or MPZ2012S221A 。

Figure 6: Power supply application circuit

In addition, in order to guard for ESD or surge protection, it is suggested to use a TVS to protect the module.

Customer could only power pin 62, 63 or only power pin 38, 39, for these pins are connected inside the module.

www.simcom.com

22 / 74

SIM7600 Series Hardware Design V1.08

Table 7: Recommended TVS list

5

6

3

4

No Manufacturer Part Number

1

2

Js-ele

Prisem

Reverse Stand-Off Voltage Package

ESDBW5V0A1 5V

PESDHC2FD4V5BH 4.5V

DFN1006-2L

DFN1006-2L

Way-on

Will semi

Will semi

Way-on

WS05DPF-B

ESD5611N

ESD56151W05

WS4.5DPV

5V

5V

5V

4.5V

DFN1006-2L

DFN1006-2L

SOD-323

DFN1610-2L

3.1.2

Recommended Power Supply Circuit

It is recommended that a switching mode power supply or a linear regulator power supply is used. It is important to make sure that all the components used in the power supply circuit can resist a peak current up to 2A.

The following figure shows the linear regulator reference circuit with 5V input and 3.8V output.

Figure 7: Linear regulator reference circuit

If there is a big voltage difference between input and output for VBAT power supply, or the efficiency is extremely important, then a switching mode power supply will be preferable. The following figure shows the switching mode power supply reference circuit.

www.simcom.com

Figure 8: Switching mode power supply reference circuit

23 / 74

SIM7600 Series Hardware Design V1.08

1.

The Switching Mode power supply solution for VBAT must be chosen carefully against Electro

Magnetic Interference and ripple current from depraving RF performance.

2.

If the DC input is 12V, customer must select a buck circuit to get better power efficiency.

3.1.3

Voltage Monitor

To monitor the VBAT voltage, the AT command “AT+CBC” can be used.

For monitoring the VBAT voltage outside or within a special range, the AT command “AT+CVALARM” can be used to enable the under-voltage warning function.

If users need to power off module, when the VBAT voltage is out of a range, the AT command “AT+CPMVT” can be used to enable under-voltage power-off function.

Under-voltage warning function and under-voltage power-off function are disabled by default. For more information about these AT commands, please refer to Document [1].

3.2 Power on/Power off/Reset Function

3.2.1

Power on

Module can be powered on by pulling the PWRKEY pin down to ground.

The PWRKEY pin has been pulled up with a diode to 1.8V internally, so it does not need to be pulled up externally. It is strongly recommended to put an ESD protection diode, close to the PWRKEY pin as it would strongly enhance the ESD performance of PWRKEY pin. Please refer to the following figure for the recommended reference circuit.

www.simcom.com

Figure 9: Reference power on/off circuit

24 / 74

SIM7600 Series Hardware Design V1.08

Module could be automatically power on by connecting PWRKEY pin to ground via 0R resistor directly.

The power-on scenarios are illustrated in the following figure.

Figure 10: Power on timing sequence

Table 8: Power on timing and electronic characteristic

Symbol Parameter

T on

T on(status)

The time of active low level impulse of PWRKEY pin to power on module

The time from power-on issue to STATUS pin output high level(indicating power up ready)

T on(uart)

The time from power-on issue to UART port ready

T on(vdd_aux)

The time from power-on issue to VDD_AUX ready

T on(vdd_1V8)

The time from power-on issue to VDD_1V8 ready

T on(usb)

The time from power-on issue to USB port ready

V

IH

V

IL

Input high level voltage on PWRKEY pin

Input low level voltage on PWRKEY pin

-

11

100

11

0.6

-0.3

Min. Typ. Max. Unit

100

12

500

16 -

ms s

12

2.5

-

12

0.8

0

-

-

-

-

1.8

0.5

V

V s s ms s www.simcom.com

25 / 74

SIM7600 Series Hardware Design V1.08

3.2.2

Power off

The following methods can be used to power off module.

●

Method 1: Power off module by pulling the PWRKEY pin down to ground.

●

●

●

Method 2: Power off module by AT command “AT+CPOF”.

Method 3: over-voltage or under-voltage automatic power off. The voltage range can be set by AT command “AT+CPMVT”.

Method 4: over-temperature or under-temperature automatic power off.

If the temperature is outside the range of -30~+80 ℃ , some warning will be reported via AT port. If the temperature is outside the range of -40~+85 ℃ , module will be powered off automatically.

For details about “AT+CPOF” and “AT+CPMVT”, please refer to Document [1].

These procedures will make module disconnect from the network and allow the software to enter a safe state, and save data before module be powered off completely.

The power off scenario by pulling down the PWRKEY pin is illustrated in the following figure.

Figure 11: Power off timing sequence

Table 9: Power off timing and electronic characteristic

Symbol

T off

T off(status)

T off(uart)

Parameter

The active low level time pulse on PWRKEY pin to power off module

The time from power-off issue to STATUS pin output low level(indicating power off )*

The time from power-off issue to UART port off www.simcom.com

Min. Typ. Max. Unit

2.5

-5.0

s

25

14

26

15 -

s s

26 / 74

T off(usb)

T off(VDD_AUX)

T off(VDD_1V8)

T off-on

The time from power-off issue to USB port off

The time from power-off issue to vdd_aux off

The time from power-off issue to vdd_1V8f

SIM7600 Series Hardware Design V1.08

The buffer time from power-off issue to power-on issue

27

20

20

0 -

-

-

28

-

-

-

s s s s

1. The STATUS pin can be used to detect whether module is powered on or not. When module has been powered on and firmware goes ready, STATUS will be high level, or else STATUS will still low level.

2. It is suggested that the host can cut off the power off the module, when the module could not switch off by PWRKEY of RESET interface, customer could cut off the power to restart the module.

3. If the PWERKY and RESET key works normally, it is not suggested to switch off module by remove the power supply for that might damage the flash.

4. The power off time may vary for the local net status.

3.2.3

Reset Function

Module can be reset by pulling the RESET pin down to ground.

This function is only used as an emergency reset, when AT command “AT+CPOF” and the PWRKEY pin all have lost efficacy.

The RESET pin has been pulled up with a 40KΩ resistor to 1.8V internally, so it does not need to be pulled up externally. It is strongly recommended to put a100nF capacitor and an ESD protection diode close to the

RESET pin. Please refer to the following figure for the recommended reference circuit.

www.simcom.com

Figure 12: Reference reset circuit

27 / 74

SIM7600 Series Hardware Design V1.08

Customers can RESET by pulling down the RESET signal, and the RESET time sequence diagram is shown in the following figure:

Symbol

T

RST

T

RST(delay)

T

RST(STATUS)

T

RST(USB)

T

RST(UART)

T

RST(VDD_1V8)

T

RST(VDD_AUX)

V

IH

V

IL

Figure 13: Reset timing sequence

Table 10: Reset timing parameters

Parameter

The active low level time impulse on RESET pin to reset module

STATUS VDD_1V8 VDD_AUX delay time

The Reset time (According to the STATUS pin judge)

The Reset time (According to the USB judge)

The Reset time (According to the UART judge)

The Reset time (According to the VDD_1V8 judge)

The Reset time (According to the VDD_AUX judge)

Input high level voltage

Input low level voltage

2.3

1.17

-0.3

13

11

12

60

Min.

Typ.

Max. Unit

100 200 500 ms

95 100 ms

14

12

13

80 s s s ms

2.5

1.8

0

3

2.1

0.8

s

V

V

1. When the module could not switch off by PWRKEY of RESET interface, customer should cut off the power to restart the module.

2. If the PWERKY and RESET key works normally, it is not suggested to switch off module by remove the power supply for that might damage the flash.

www.simcom.com

28 / 74

SIM7600 Series Hardware Design V1.08

3.3 UART Interface

Module provides a 7-wire UART (universal asynchronous serial transmission) interface as DCE (Data

Communication Equipment). AT commands and data transmission can be performed through UART interface.

3.3.1

UART Design Guide

The following figures show the reference design.

Figure 14: UART full modem

Figure 15: UART null modem

The module UART is 1.8V voltage interface. If user’s UART application circuit is 3.3V voltage interface, the level shifter circuits should be used for voltage matching. The TXB0108RGYR provided by Texas

Instruments is recommended. The following figure shows the voltage matching reference design.

www.simcom.com

29 / 74

SIM7600 Series Hardware Design V1.08

Figure 16: Reference circuit of level shift

Customers can use another level shifter circuits as follow.

Figure 17: Level matching circuit with triode

1.

User need to use high speed transistors such as MMBT3904.

2.

Module supports the following baud rates: 300, 600, 1200, 2400, 4800, 9600, 19200, 38400,

57600, 115200, 230400, 460800, 921600, 3200000, 3686400, 4000000bps. The default band rate is 115200bps.

www.simcom.com

30 / 74

SIM7600 Series Hardware Design V1.08

3.3.2

RI and DTR Behavior

The RI pin can be used to interrupt output signal to inform the host controller such as application CPU.

Normally RI will keep high level until certain conditions such as receiving SMS, or a URC report coming, and then it will change to low level.

Figure 18: RI behaviour （ SMS and URC report ）

Normally RI will be kept at a high level until a voice call, then it will output periodic rectangular wave with

5900ms low level and 100ms high level. It will output this kind of periodic rectangular wave until the call is answered or hung up.

Figure 19: RI behaviour （ voice call ）

For more details of AT commands about UART, please refer to document [1] and [22].

DTR pin can be used to wake module from sleep. When module enters sleep mode, pulling down DTR can wake module.

www.simcom.com

31 / 74

SIM7600 Series Hardware Design V1.08

3.4 USB Interface

The module contains a USB interface compliant with the USB2.0 specification as a peripheral, but the USB charging function is not supported.

3.4.1

USB diagram

Module can be used as a USB device. module supports the USB suspend and resume mechanism which can reduce power consumption. If there is no data transmission on the USB bus, module will enter suspend mode automatically, and will be resumed by some events such as voice call, receiving SMS, etc.

The USB interface is a frequency used debug port; it is suggested to reserved test point.

Figure 20: USB reference circuit

Because of the high bit rate on USB bus, more attention should be paid to the influence of the junction capacitance of the ESD component on USB data lines. Typically, the capacitance should be less than 1pF. It is recommended to use an ESD protection component such as ESD9L5.0ST5G provided by On

Semiconductor (www.onsemi.com ).

The USB_DN and USB_DP nets must be traced by 90Ohm+/-10% differential impedance.

3.4.2

USB_BOOT

Module can enter in force download mode by USB_BOOT.

Table 11: USB_BOOT description

PIN No PIN Name I/O description Power domain Default status Index

85 USB_BOOT DI USB boot 1.8V

B-PD www.simcom.com

32 / 74

SIM7600 Series Hardware Design V1.08

If the module download failed, then customer can make module enter download mode via this Pin.

Before the module power on, pull up the USB_BOOT to VDD_1V8 ， then push the PWRKEY to power on module, when the module enter download mode, the pull up should be removed.

Figure 21: USB_BOOT circuit

Customer can check the download port in the device management.

Figure 22: Force download port

3.4.3

USB_ID

Module support OTG function ， but the USB_VBUS(PIN 11) cannot supply device with 5V, so customer should design the circuit to power the USB device.

For the detail circuit, customer could refer to SIM7600 Series EMMC-Reference Design .

www.simcom.com

33 / 74

SIM7600 Series Hardware Design V1.08

Table 12: USB_ID description

PIN

No

PIN

Name

I/O Function description

High level: module in USB device mode.

16 USB_ID DI

Low level: module in USB host mode.

Domain Default

Status

1.8V

DI-PH

index

Figure 23: USB_OTG diagram

3.5 USIM Interface

Module supports both 1.8V and 3.0V USIM Cards.

Table 13: USIM electronic characteristic in 1.8V mode (USIM_VDD=1.8V)

Symbol

USIM_VDD

V

IH

V

IL

V

OH

V

OL

Parameter

LDO power output voltage

High-level input voltage

Low-level input voltage

High-level output voltage

Low-level output voltage

Min.

1.75

0.65*USIM_VDD -

-0.3

USIM_VDD -0.45 -

0

Typ.

1.8

0

0

Max.

1.95

USIM_VDD +0.3

V

Unit

V

0.35*USIM_VDD V

USIM_VDD V

0.45

V www.simcom.com

34 / 74

SIM7600 Series Hardware Design V1.08

Table 14: USIM electronic characteristic 3.0V mode (

USIM_VDD

=2.95V)

Symbol

USIM_VDD

V

IH

V

IL

V

OH

V

OL

Parameter

LDO power output voltage

High-level input voltage

Low-level input voltage

High-level output voltage

Low-level output voltage

Min.

2.75

0.65*USIM_VDD -

Typ. Max.

2.95

3.05

USIM_VDD +0.3

-0.3

USIM_VDD -0.45 -

0

0 0

0.25*USIM_VDD

USIM_VDD

0.45

V

V

V

Unit

V

V

3.5.1

USIM Application Guide

It is recommended to use an ESD protection component such as ESDA6V1W5 produced by ST

(www.st.com ) or SMF15C produced by ON SEMI (www.onsemi.com ). Note that the USIM peripheral circuit should be close to the USIM card socket. The following figure shows the 6-pin SIM card holder reference circuit.

Figure 24: USIM interface reference circuit

1. USIM_DATA has been pulled up with a 10KΩ resistor to USIM_VDD in module. A 100nF capacitor on USIM_VDD is used to reduce interference.

2. For more details of AT commands about USIM, please refer to document [1]. USIM_CLK is very important signal, the rise time and fall time of USIM_CLK should be less than 40ns, otherwise the

USIM card might not be initialized correctly.

The USIM_DET pin is used for detection of the USIM card hot plug in. User can select the 8-pin USIM card holder to implement USIM card detection function.

www.simcom.com

35 / 74

SIM7600 Series Hardware Design V1.08

The following figure shows the 8-pin SIM card holder reference circuit.

Figure 25: USIM interface reference circuit with USIM_DET

If the USIM card detection function is not used, user can keep the USIM_DET pin open.

3.5.2

USIM Design Notice

USIM card circuit is susceptible; the interference may cause the SIM card failures or some other situations, so it is strongly recommended to follow these guidelines while designing:

 Make sure that the SIM card holder should be far away from the antenna while in PCB layout.

 SIM traces should keep away from RF lines, VBAT and high-speed signal lines.

 The traces should be as short as possible.

 Keep SIM holder’s GND connect to main ground directly.

 Shielding the SIM card signal by ground.

 Recommended to place a 0.1

～ 1uF capacitor on USIM_VDD line and keep close to the holder.

 The rise/fall time of USIM_CLK should not be more than 40ns.

 Add some TVS and the parasitic capacitance should not exceed 60pF.

3.5.3

Recommended USIM Card Holder

It is recommended to use the 6-pin USIM socket such as C707 10M006 512 produced by Amphenol. User can visit http://www.amphenol.com for more information about the holder.

www.simcom.com

36 / 74

SIM7600 Series Hardware Design V1.08

Figure 26: Amphenol SIM card socket

Table 15: Amphenol USIM socket pin description

Pin

C1

C2

C3

C5

C6

C7

Signal

USIM_VDD

USIM_RST

USIM_CLK

GND

VPP

USIM_DATA

Description

USIM Card Power supply.

USIM Card Reset.

USIM Card Clock.

Connect to GND.

USIM Card data I/O.

3.6 PCM Interface

Module provides a PCM interface for external codec, which can be used in master mode with short sync and 16 bits linear format.

Table 16: PCM format

Characteristics

Line Interface Format

Data length

PCM Clock/Sync Source www.simcom.com

Specification

Linear (Fixed)

16bits(Fixed)

Master Mode(Fixed)

37 / 74

PCM Clock Rate

PCM Sync Format

Data Ordering

SIM7600 Series Hardware Design V1.08

2048kHz （ 2G/3G ） 4096Khz (4G)

Short sync(Fixed)

MSB

For more details about PCM AT commands, please refer to document [1].

3.6.1

PCM timing

Module supports 2.048 MHz PCM data and sync timing for 16 bits linear format codec.

Figure 27: PCM_SYNC timing www.simcom.com

Figure 28: EXT codec to module timing

Figure 29: Module to EXT codec timing

38 / 74

SIM7600 Series Hardware Design V1.08

Symbol

T(sync)

T(synch)

T(syncl)

T(clk)

T(clkh)

T(clkl)

T(susync)

T(hsync)

T(sudin)

T(hdin)

T(pdout)

T(zdout)

Table 17: PCM timing parameters (2G/3G mode)

Parameter Min.

Typ.

Max.

Unit

PCM_SYNC cycle time

PCM_SYNC high level time

PCM_SYNC low level time

PCM_CLK cycle time

PCM_CLK high level time –

PCM_CLK low level time

PCM_SYNC setup time high before falling edge of PCM_CLK

PCM_SYNC hold time after falling edge of

PCM_CLK

PCM_IN setup time before falling edge of

PCM_CLK

–

–

–

60

PCM_IN hold time after falling edge of PCM_CLK 10

Delay from PCM_CLK rising to PCM_OUT valid –

Delay from PCM_CLK falling to PCM_OUT

HIGH-Z

–

–

–

–

–

125

488

124.5

–

488 –

–

–

244

244

–

–

244

244

–

–

–

160 -

–

–

–

–

60 ns ns ns ns ns ns

μs ns

μs ns ns ns

Symbol

T(sync)

T(synch)

T(syncl)

T(clk)

T(clkh)

T(clkl)

T(susync)

T(hsync)

T(sudin)

T(hdin)

T(pdout)

T(zdout)

Table 18: PCM timing parameters (4G mode)

Parameter Min.

Typ.

Max.

Unit

PCM_SYNC cycle time

PCM_SYNC high level time

PCM_SYNC low level time

PCM_CLK cycle time

PCM_CLK high level time

–

–

–

–

–

PCM_CLK low level time –

PCM_SYNC setup time high before falling edge of PCM_CLK

PCM_SYNC hold time after falling edge of

PCM_CLK

PCM_IN setup time before falling edge of

PCM_CLK

–

–

122

PCM_IN hold time after falling edge of PCM_CLK 122

Delay from PCM_CLK rising to PCM_OUT valid –

Delay from PCM_CLK falling to PCM_OUT

HIGH-Z

–

62.5

244

62.256 –

244

122

122 –

–

–

–

–

122

122

–

–

–

–

–

–

–

–

122

122 ns ns ns ns ns ns

μs ns

μs ns ns ns www.simcom.com

39 / 74

3.6.2

PCM Application Guide

The following figure shows the external codec reference design.

SIM7600 Series Hardware Design V1.08

Figure 30: Audio codec reference circuit

3.7 SD Interface

Module provides a 4-bit SD/MMC interface with clock rate up to 200 MHz, The voltage of MMC/SD interface is 2.85V, which is compatible with SDIO Card Specification (version 3.0) and Secure Digital (Physical Layer

Specification, version 3.0). It supports up to 32GB SD cards.

Table 19: MMC/SD electronic characteristic (SD_DATA0-SD_DATA3 ， SD_CLK and SD_CMD) *

Symbol

V

IH

V

IL

V

OH

V

OL

Parameter

High-level input voltage

Low-level input voltage

High-level output voltage

Low-level output voltage

Min.

0.65*2.85

-0.3

2.85-0.4

0

Typ.

-

0

2.85

0

Max.

Unit

2.85+0.3

V

0.25*2.85 V

2.85

V

0.45

V

SD_DET is 1.8V operation voltage ,which is different from SD_DATA0-SD_DATA3 ， SD_CLK or

SD_CMD.

Users should provide 2.85V to power SD card system and the current should more than 500mA, which is showed below as VDD_SD. ESD/EMI components should be arranged beside SD card socket. Refer to the following application circuit.

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SIM7600 Series Hardware Design V1.08

Figure 31: SD reference circuit

SD card layout guide lines:

●

Protect other sensitive signals/circuits from SD card signals.

●

●

●

Protect SD card signals from noisy signals (clocks, SMPS, etc.).

Up to 200 MHz clock rate, 50 Ω nominal, ±10% trace impedance

CLK to DATA/CMD length matching < 1 mm

●

●

●

●

●

15–24 Ω termination resistor on clock lines near module

Total routing length < 50 mm recommended

Routing distance from module clock pin to termination resistor < 5 mm

Spacing to all other signals = 2x line width

Bus capacitance < 15 pF

3.8 I2C Interface

Module provides a I2C interface compatible with I2C specification, version 5.0, with clock rate up to 400 kbps. Its operation voltage is 1.8V.

The following figure shows the I2C bus reference design.

www.simcom.com

Figure 32: I2C reference circuit

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SIM7600 Series Hardware Design V1.08

1. SDA and SCL do not have pull-up resistors in module. So, 2 externals pull up resistors are needed in application circuit.

2. If the I/O of slave device is 3.3V, then the level shifter circuits should be needed.

3. “AT+CRIIC and AT+CWIIC” AT commands could be used to read/write register values of the I2C peripheral devices.

4. For more details about AT commands please refer to document [1].

3.9 SDIO Interface

Module provides a 4 bit 1.8V SDIO interface for WLAN solution with W58 module.

Special software version for CAT4 modules support this function.

3.10 SPI Interface

Module provides a SPI interface as a master only. Its operation voltage is 1.8V, and its clock rate is up to 26

MHz.

This function is reserved. For detail information please contact with FAE.

3.11 Network Status

The NETLIGHT pin is used to control Network Status LED, its reference circuit is shown in the following figure.

Figure 33: NETLIGHT reference circuit

The value of the resistor named “R” depends on the LED characteristic.

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SIM7600 Series Hardware Design V1.08

Table 20: NETLIGHT pin status

NETLIGHT pin status

Always On

200ms ON, 200ms OFF

800ms ON, 800ms OFF

OFF

Module status

Searching Network; Call Connect (include VOLTE,SRLTE)

Data Transmit; 4G registered;

2G/3G registered network

Power off; Sleep

NETLIGHT output low level as “OFF”, and high level as “ON”.

3.12Flight Mode Control

The FLIGHTMODE pin can be used to control module to enter or exit the Flight mode. In Flight mode, the

RF circuit is closed to prevent interference with other equipment and minimize current consumption.

Bidirectional ESD protection component is suggested to add on FLIGHTMODE pin, its reference circuit is shown in the following figure.

Figure 34: Flight mode switch reference circuit

Table 21: FLIGHTMODE pin status

FLIGHTMODE pin status

Input Low Level

Input High Level

Module operation

Flight Mode: RF is closed

AT+CFUN=0: RF is closed

AT+CFUN=1:RF is working www.simcom.com

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SIM7600 Series Hardware Design V1.08

3.13HSIC Interface

HSIC is a 2-signal source synchronous serial interface which uses 240MHz DDR signaling to provide

High-Speed 480Mbps USB transfers which are 100% host driver compatible with traditional USB cable-connected topologies. Full-Speed (FS) and Low-Speed (LS) USB transfers are not directly supported by the HSIC interface (a HSIC enabled hub can provide FS and LS support, as well as IC_USB support)

The differences between HSIC and USB2.0 are listed below:

Table 22: Key differences between HSIC and USB

HSIC

Signal-ended signaling at 1.2 V

Two signals – STROBE, DATA

Double data rate signaling

HS-USB 480 Mbps only

Maximum trace length of 10 cm

No HS chirp protocol

Lower power consumption (digital)

No concept of disconnect

USB

Differential signaling

Four wires – Ground, D+, D-, VBUS

Data inferred from differential signaling

HS/FS/LS support

Maximum cable length of 5 m

HS chirp protocol

Higher power consumption (analog)

Hot plug/play support

SIM7600 implements a HSIC interface compliant with the HSIC1.0 specification which can be used to connect to the external IC. And the HSIC could be transferred to USB2.0 by some dedicated Hub Controller, in that case, you could regard SIM7600 as having two USB interfaces.

The SIM7600 HSIC can only work as the slave by default, if the host mode is needed, please contact

SIMCom for more details.

3.14GPIO Interface

SIM7600CE WIFI/BT version module provides 2 GPIO for customer use.

The STATUS pin default high for the module status indicate, it is keep high after the module power on, and it can be controlled by the AT commands “AT+CGFUNC” for other use.

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SIM7600 Series Hardware Design V1.08

Table 23: WIFI/BT Version GPIO

Pin No PIN Name

49

48

STATUS

GPIO26

GPIO No in

AT command

41

44

INT

√

√

Power

Domain

P3

P3

Default status

B-PU

B-PD

Default

Functio n

Multiple x

Functio n

STATUS GPIO52

GPIO SD_DTE

SIM7600CE standard version (without WIFI and BT) module provides 7 GPIO for customer use.

Table 24:Standard version GPIO

Pin No PIN Name

50

52

87

33

34

48

49

GPIO3

GPIO6

GPIO26

STATUS

GPIO43

GPIO41

GPIO77

43

41

77

3

6

44

40

GPIO No in

AT command

INT

√

√

√

Power

Domain

P3

P3

P3

-

-

P3

P3

Default status

B-PD

B-PD

B-PD

B-PU

B-PD

B-PD

B-PD

Default

Functio n

Multiple x

Functio n

GPIO

GPIO

GPIO SD_DTE

STATUS GPIO

GPIO

GPIO

GPIO

3.15Other Interface

3.15.1

Sink Current Source

The ISINK pin is VBAT tolerant and intended to drive some passive devices, such as LCD backlight and white LED, etc. Its output current can be up to 40mA and be set by the AT command “AT+ CLEDITST”.

Table 25: Sink current electronic characteristic

Symbol

V

ISINK

I

ISINK

Description

Voltage tolerant

Current tolerant

Min.

Typ.

Max.

Unit

0.5

VBAT V

0 40 mA www.simcom.com

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SIM7600 Series Hardware Design V1.08

ISINK is a ground-referenced current sink. The following figure shows its reference circuit.

Figure 35: ISINK reference circuit

The sinking current can be adjusted to meet the design requirement through the AT command “AT+

CLEDITST =<0>, <value>”.The “value” ranges from 0 to 8, on behalf of the current from 0mA to 40mA by 5mA step.

3.15.2

ADC

Module has 2 dedicated ADC pins named ADC1 and ADC2.They are available for digitizing analog signals such as battery voltage and so on. These electronic specifications are shown in the following table.

Table 26: ADC1 and ADC2 electronic characteristics

Characteristics

Resolution

Conversion time

Input Range

Input serial resistance

Min.

–

–

0.1

1

Typ.

15

442

–

Max.

–

–

1.7

–

Unit

Bits us

V

MΩ

“AT+CADC” and “AT+CADC2” can be used to read the voltage of the ADC1 and ADC2 pins, for more details, please refer to document [1].

3.15.3

LDO

Module has a LDO power output, named VDD_AUX. its output voltage is 2.85V by default, Users can switch the LDO on or off by the AT command “AT+CVAUXS” and configure its output voltage by the AT command “AT+CVAUXV”.

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SIM7600 Series Hardware Design V1.08

Table 27: Electronic characteristic

Symbol

V

VDD_AUX

I

O

Description

Output voltage

Output current -

Min.

1.7

-

Typ.

2.85

For more details of AT commands about VDD_AUX, please refer to document [1].

Max.

3.05

150

Unit

V mA www.simcom.com

47 / 74

SIM7600 Series Hardware Design V1.08

4 RF Specifications

4.1 GSM/UMTS/LTE RF Specifications

Table 28: Conducted transmission power

Frequency

GSM850

EGSM900

DCS1800

PCS1900

GSM850 (8-PSK)

EGSM900 (8-PSK)

DCS1800 (8-PSK)

PCS1900 (8-PSK)

WCDMA B1

WCDMA B2

WCDMA B5

WCDMA B8

LTE-FDD B1

LTE-FDD B3

LTE-FDD B4

LTE-FDD B5

LTE-FDD B7

LTE-FDD B8

LTE-FDD B12

LTE-FDD B13

LTE-FDD B18

LTE-FDD B19

LTE-FDD B20

LTE-FDD B26

LTE-FDD B28

LTE-TDD B38

LTE-TDD B40

LTE-TDD B41

Power

33dBm ±2dB

33dBm ±2dB

30dBm ±2dB

30dBm ±2dB

27dBm ±3dB

27dBm ±3dB

26dBm +3/-4dB

26dBm +3/-4dB

24dBm +1/-3dB

24dBm +1/-3dB

24dBm +1/-3dB

24dBm + 1/-3dB

23dBm +/-2.7dB

23dBm +/-2.7dB

23dBm +/-2.7dB

23dBm +/-2.7dB

23dBm +/-2.7dB

23dBm +/-2.7dB

23dBm +/-2.7dB

23dBm +/-2.7dB

23dBm +/-2.7dB

23dBm +/-2.7dB

23dBm +/-2.7dB

23dBm +/-2.7dB

23dBm +/-2.7dB

23dBm +/-2.7dB

23dBm +/-2.7dB

23dBm +/-2.7dB

Min

5dBm ± 5dB

<-40dBm

<-40dBm

<-40dBm

<-40dBm

<-40dBm

<-40dBm

<-40dBm

<-40dBm

<-40dBm

5dBm ± 5dB

0dBm ± 5dB

0dBm ± 5dB

5dBm ± 5dB

5dBm ± 5dB

0dBm ±5dB

0dBm ±5dB

<-50dBm

<-50dBm

<-50dBm

<-50dBm

<-40dBm

<-40dBm

<-40dBm

<-40dBm

<-40dBm

<-40dBm

<-40dBm www.simcom.com

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SIM7600 Series Hardware Design V1.08

Table 29: Operating frequencies

Frequency

GSM850

Receiving

869 ～ 894MHz

Transmission

824 ～ 849 MHz

EGSM900

DCS1800

PCS1900

WCDMA B1

WCDMA B2

925 ～ 960MHz

1805 ～ 1880 MHz

1930~1990 MHz

880 ～ 915 MHz

1710 ～ 1785 MHz

1850~1910 MHz

WCDMA B5 869 ～ 894 MHz

1574.4

～ 1576.44 MHz

824 ～ 849 MHz

WCDMA B8 925 ～ 960 MHz 880 ～ 915 MHz

The LTE Operating frequencies are shown in the following table 24.

Note: Operating frequencies of LTE TDD B41 for the module is 100MHz BW, 2555 ～ 2655 MHz

GPS -

GLONASS

BD

2110 ～ 2170 MHz

1930~1990 MHz

1598

1559

～

～

1606 MHz

1563 MHz

-

1920 ～ 1980 MHz

1850~1910 MHz

E-UTRA Band

LTE-FDD B1

LTE-FDD B2

LTE-FDD B3

LTE-FDD B4

LTE-FDD B5

LTE-FDD B7

LTE-FDD B8

LTE-FDD B12

LTE-FDD B13

LTE-FDD B18

LTE-FDD B19

LTE-FDD B20

LTE-FDD B26

LTE-FDD B28

LTE-TDD B38

LTE-TDD B40

LTE-TDD B41

Table 30: E-UTRA operating bands

Uplink (UL)

1920 ~1980 MHz

1850~1910 MHz

1710 ~1785 MHz

1710~1755MHz

824 ～ 849 MHz

2500~2570MHz

880 ~915 MHz

699~716MHz

777~787MHz

815~830MHz

830~845MHz

832~862MHz

814~849MHz

703~748MHz

2570 ~2620 MHz

2300 ~2400 MHz

2496 ~2690 MHz

Downlink (DL)

2110 ~2170 MHz

1930~1990 MHz

1805 ~1880 MHz

2110~2155MHz

869 ～ 894MHz

2620~2690MHz

925 ~960 MHz

728~746MHz

746~757MHz

860~875MHz

875~890MHz

791~ 821MHz

859~894MHz

758~803MHz

2570 ~2620 MHz

2300 ~2400 MHz

2496 ~2690 MHz www.simcom.com

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SIM7600 Series Hardware Design V1.08

Table 31: Conducted receive sensitivity

Frequency

GSM850

EGSM900

DCS1800

PCS1900

WCDMA B1

WCDMA B2

WCDMA B5

WCDMA B8

LTE FDD/TDD

Receive sensitivity (Typical)

< -109dBm

< -109dBm

< -109dBm

< -109dBm

< -110dBm

< -110dBm

< -110dBm

< -110dBm

See table 26.

Receive sensitivity (MAX)

3GPP

3GPP

3GPP

3GPP

3GPP

3GPP

3GPP

3GPP

3GPP

Table 32: Reference sensitivity (QPSK)

E-UTRA band

LTE-FDD B1

LTE-FDD B2

LTE-FDD B3

LTE-FDD B4

LTE-FDD B5

LTE-FDD B7

LTE-FDD B8

LTE-FDD B12

LTE-FDD B13

LTE-FDD B18

LTE-FDD B19

LTE-FDD B20

LTE-FDD B26

LTE-FDD B28

LTE-TDD B38

LTE-TDD B40

LTE-TDD B41

-

-

-

1.4 MHz 3 MHz

-

-102.7

-101.7

-104.7

-103.2

-

-99.7

-98.7

-101.7

-100.2

-102.2

-101.7

-102.7

-99.2

-98.7

-

-

-

-99.7

-100.2

5 MHz

-100

-97

-97.5

-98.5

-100

-100

-99

-100

-98

-97

-100

-98

-98

-97

-97

-97

-100

Standard

-97

-94

-94.5

-95.5

-97

-97

-96

-94

-94

-94

-97

-97

-95

-94

-97

-95

-95

10 MHz 15 MHz 20 MHz

-95.2

-93.2

-92.2

-95.2

-94

-92

-91

-94

-93.2

-95.2

-95.2

-91.2

-92.7

-93.7

-95.2

-95.2

-94.2

-92

-90

-91

-94

-94

-93

Test Value

@10 MHz

-101

-98

-99

-99

-101

-101

-101

-101

-99

-99

-101

-99

-97

-102

-99

-99

-101 www.simcom.com

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SIM7600 Series Hardware Design V1.08

4.2 GSM /UMTS/LTE Antenna Design Guide

Users should connect antennas to module’s antenna pads through micro-strip line or other types of RF trace and the trace impedance must be controlled in 50Ω. SIMCom recommends that the total insertion loss between the antenna pads and antennas should meet the following requirements:

Table 33: Trace loss

Frequency

700MHz-960MHz

1710MHz-2170MHz

2300MHz-2650MHz

Loss

<0.5dB

<0.9dB

<1.2dB

To facilitate the antenna tuning and certification test, a RF connector and an antenna matching circuit should be added. The following figure is the recommended circuit.

Figure 36: Antenna matching circuit (MAIN_ANT)

In above figure, the components R1, C1, C2 and R2 are used for antenna matching, the values of components can only be achieved after the antenna tuning and usually provided by antenna vendor. By default, the R1, R2 are 0Ω resistors, and the C1, C2 are reserved for tuning. The component D1 is a TVS for ESD protection, and it is optional for users according to application environment.

The RF test connector is used for the conducted RF performance test, and should be placed as close as to the module’s MAIN_ANT pin. The traces impedance between module and antenna must be controlled in

50Ω.

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SIM7600 Series Hardware Design V1.08

Figure 37: Antenna matching circuit (AUX_ANT)

In above figure, R3, C3, C4 and R4 are used for auxiliary antenna matching. By default, the R3, R4 are

0Ωresistors, and the C3, C4 are reserved for tuning. D2 is a TVS for ESD protection, and it is optional for users according to application environment.

Two TVS are recommended in the table below.

Table 34: Recommended TVS

Package

0201

0402

0402

Part Number

WE05DGCMS-BH

PESD0402-03

PESD0402-12

Vender

CYGWAYON

PRISEMI

PRISEMI

SIMCom suggests the LTE auxiliary antenna to be kept on, since there are many high bands in the designing of LTE-TDD, such as band38, band40 and band41. Because of the high insert loss of the RF cable and layout lines, the receiver sensitivity of these bands above will have risk to meet the authentication without the diversity antenna. For more details about auxiliary antenna design notice, please refer to document [25].

4.3 GNSS

Module merges GNSS (GPS/GLONASS/BD/QZSS GALILEO) satellite and network information to provide a high-availability solution that offers industry-leading accuracy and performance. This solution performs well, even in very challenging environmental conditions where conventional GNSS receivers fail, and provides a platform to enable wireless operators to address both location-based services and emergency mandates.

4.3.1

GNSS Technical specification

 Tracking sensitivity: -159 dBm （ GPS ） /-158 dBm （ GLONASS ） /-159 dBm （ BD ） /-159 dBm （ GALILEO ）

 Cold-start sensitivity: -148 dBm

 Accuracy (Open Sky): 2.5m (CEP50) www.simcom.com

52 / 74

SIM7600 Series Hardware Design V1.08

 TTFF (Open Sky): Hot start <1s, Cold start<35s

 Receiver Type: 16-channel, C/A Code

 GPS L1 Frequency: 1575.42±1.023MHz

 GLONASS: 1597.5~1605.8 MHz

 BD: 1559.05~1563.14 MHz

 GALILEO: 1575.42±1.023MHz

 Update rate: Default 1 Hz

 GNSS data format: NMEA-0183

 GNSS Current consumption: 100mA (GSM/UMTS/LTE Sleep ,in total on VBAT pins)

 GNSS antenna: Passive/Active antenna

Table 35: Recommended Passive Antenna Characteristics

Pa ssive

Direction

Gain

Input impedance

Efficiency

VSWR

Recommended standard

Omnidirectional

> -3dBi（ Avg ）

50 ohm

>50%

<2

If the antenna is active type, the power should be given by main board because there is no power supply on the GPS antenna pad. If the antenna is passive, it is suggested that the external LNA should be used.

4.3.2

GNSS Application Guide

Users can adopt an active antenna or a passive antenna to module. If using a passive antenna, an external

LNA is a must to get better performance.

The following figures are the reference circuits.

www.simcom.com

Figure 38: Active antenna circuit

53 / 74

SIM7600 Series Hardware Design V1.08

NOTE

If customer need save the power when the GNSS function is disabled, then customer should design a switch circuit to cut off the active antenna power to get a lower power consumption.

Figure 39: Passive antenna circuit (Default)

In above figures, the components C1, L1 and L2 are used for antenna matching. Usually, the values of the components can only be achieved after antenna tuning and usually provided by antenna vendor. C2 is used for DC blocking. L3 is the matching component of the external LNA, and the value of L3 is determined by the LNA characteristic and PCB layout. Both VDD of active antenna and V_LNA need external power supplies which should be considered according to active antenna and LNA characteristic. LDO/DCDC is recommended to get lower current consuming by shutting down active antennas and LNA when GNSS is not working.

Table 36: Recommended LNA and SAW Filter

Material

GPS LNA

GPS LNA

GPS LNA

GPS SAW FILTER

GPS SAW FILTER

Part Number

MXDLN16TP

BGA725L6

BGA824N6

HDF1588E-B5

SAFFB1G56KB0F0A

Vendor

MAXSCEND

Infineon

Infineon

SHOULDER murata

GNSS can be tested by NMEA port. NMEA sentences can be obtained through UART or USB automatically.

NMEA sentences include GSV, GGA, RMC, GSA, and VTG. Before using GNSS, user should configure module in proper operating mode by AT command. Please refer to related documents for details. module can also get position location information through AT directly.

GNSS is closed by default and can be started by AT+CGPS. The AT command has two parameters, the first is on/off, and the second is GNSS mode. Default mode is standalone mode.

AGPS mode needs more support from the mobile telecommunication network. Please refer to www.simcom.com

54 / 74

SIM7600 Series Hardware Design V1.08

document [24] for more details.

5 Electrical Specifications

5.1 Absolute maximum ratings

Absolute maximum rating for digital and analog pins of module are listed in the following table.

Table 37: Absolute maximum ratings

Parameter

Voltage at VBAT

Voltage at USB_VBUS

Voltage at digital pins (RESET, SPI, Keypad,

GPIO, I2C, UART, PCM)

Voltage at digital pins (SD, USIM)

Voltage at PWRKEY

Min.

-0.5

-0.5

-0.3

-0.3

-0.3

-

-

-

-

-

Typ.

Max.

4.7

5.5

2.1

3.05

1.8

V

V

V

Unit

V

V

5.2 Operating conditions

Table 38: Recommended operating ratings

Parameter

Voltage at VBAT

Voltage at USB_VBUS

Min.

3.4

3.0

Table 39: 1.8V Digital I/O characteristics*

Parameter

V

IH

V

IL

V

OH

V

OL

I

OH

I

OL

I

IH

Description

High-level input voltage

Low-level input voltage

High-level output voltage

Low-level output voltage

High-level output current (no pull-down resistor)

Low-level output current (no pull up resistor)

Input high leakage current (no pull-down resistor)

-

-

-

Min.

1.17

-0.3

1.35

0 www.simcom.com

Typ.

3.8

5.0

-

-2

-

-

0

Typ.

1.8

2

Max.

4.2

5.25

Unit

V

V

-

1

-

Max.

2.1

0.63

1.8

0.45

V

V

V

Unit

V mA mA uA

55 / 74

I

IL

Input low leakage current (no pull up resistor)

-1

SIM7600 Series Hardware Design V1.08

uA

These parameters are for digital interface pins, such as SPI, GPIOs (NETLIGHT, FLIGHTMODE,

STATUS, USIM_DET, SD_DET), SDIO, I2C, UART, PCM, COEXn, and USB_BOOT.

The operating temperature of module is listed in the following table.

Table 40: Operating temperature

Parameter

Normal operation temperature

Extended operation temperature*

Storage temperature

Min.

-30

-40

-45

Typ.

25

25

25

Max.

80

85

+90

Unit

℃

℃

℃

Module is able to make and receive voice calls, data calls, SMS and make GSM/ UMTX/LTE traffic in

-40 ℃ ~ +85 ℃ . The performance will be reduced slightly from the 3GPP specifications if the temperature is outside the normal operating temperature range and still within the extreme operating temperature range.

5.3 Operating Mode

5.3.1

Operating Mode Definition

The table below summarizes the various operating modes of module product.

Table 41: Operating mode Definition

Mode

GSM /UMTS/LTE

Sleep

Function

In this case, the current consumption of module will be reduced to the minimal level and the module can still receive paging message, call,

SMS and TCP/UDP.

GSM/UMTS/LTE

Talk

GPRS/EDGE/

UMTS/LTE Standby www.simcom.com

Connection between two subscribers is in progress. In this case, the power consumption depends on network settings such as DTX off/on,

FR/EFR/HR, hopping sequences, and antenna.

Module is ready for data transmission, but no data is currently sent or received. In this case, power consumption depends on network

56 / 74

SIM7600 Series Hardware Design V1.08

GPRS/EDGE/

UMTS/LTE

Data transmission

Minimum functionality mode

Flight mode

Power off settings.

There is data transmission in progress. In this case, power consumption is related to network settings (e.g. power control level); uplink/downlink data rates, etc.

AT command “AT+CFUN=0” AT+CSCLK=1 can be used to set the module to a minimum functionality mode without removing the power supply. In this mode, the RF part of the module will not work and the

USIM card will not be accessible, but the serial port and USB port are still accessible. The power consumption in this mode is lower than normal mode.

AT command “AT+CFUN=4” or pulling down the FLIGHTMODE pin can be used to set the module to flight mode without removing the power supply. In this mode, the RF part of the module will not work, but the serial port and USB port are still accessible. The power consumption in this mode is lower than normal mode.

Module will go into power off mode by sending the AT command

“AT+CPOF” or pull down the PWRKEY pin, normally. In this mode the power management unit shuts down the power supply, and software is not active. The serial port and USB are is not accessible.

5.3.2

Sleep mode

In sleep mode, the current consumption of module will be reduced to the minimal level, and module can still receive paging message and SMS and TCP/UDP.

Several hardware and software conditions must be satisfied together in order to let module enter into sleep mode:

●

UART condition

●

USB condition

●

Software condition

Before designing, pay attention to how to realize sleeping/waking function and refer to Document [26] for more details.

5.3.3

Minimum functionality mode and Flight mode

Minimum functionality mode ceases a majority function of module, thus minimizing the power consumption.

This mode is set by the AT command which provides a choice of the functionality levels.

●

●

●

AT+CFUN=0: Minimum functionality

AT+CFUN=1: Full functionality (Default)

AT+CFUN=4: Flight mode

If module has been set to minimum functionality mode, the RF function and USIM card function will be www.simcom.com

57 / 74

SIM7600 Series Hardware Design V1.08

closed. In this case, the serial port and USB are still accessible, but RF function and USIM card will be unavailable.

If module has been set to flight mode, the RF function will be closed. In this case, the serial port and USB are still accessible, but RF function will be unavailable.

When module is in minimum functionality or flight mode, it can return to full functionality by the AT command

“AT+CFUN=1”.

5.4 Current Consumption

The current consumption is listed in the table below.

Table 42: Current consumption on VBAT Pins (VBAT=3.8V)

GNSS

GNSS supply current

(AT+CFUN=0,without USB connection)

GSM sleep/idle mode

GSM/GPRS supply current

(GNSS off ， without USB connection)

UMTS sleep/idle mode

WCDMA supply current

(GNSS off ， without USB connection)

LTE sleep/idle mode

LTE supply current

(GNSS off ， without USB connection)

EVDO supply current

(GNSS off ， without USB connection)

GSM Talk

GSM850

EGSM900

DCS1800

PCS1900

UMTS Talk

WCDMA B1

WCDMA B2

WCDMA B5

WCDMA B8

GPRS

GSM850( 1 Rx,4 Tx )

EGSM900( 1 Rx,4 Tx )

DCS1800( 1 Rx,4 Tx )

PCS1900( 1 Rx,4 Tx )

GSM850( 3Rx, 2 Tx )

EGSM900( 3Rx, 2 Tx ) www.simcom.com

@ -140dBm ， Tracking Typical:35mA

Sleep mode@ BS_PA_MFRMS=2 Typical: 2.8mA

Idle mode@ BS_PA_MFRMS=2 Typical: 18mA

Sleep mode @DRX=9 Typical: 3.3mA

Idle mode @DRX=9 Typical: 17.5mA

Sleep mode Typical: 2.3mA

Idle mode Typical: 17.5mA

Sleep mode Typical: 2.0mA

Idle mode Typical: 17.8mA

@power level #5 Typical: 220mA

@ power level #5 Typical: 230mA

@power level #5 Typical: 162mA

@power level #5 Typical: 190mA

@Power 24dBm Typical: 540mA

@Power 24dBm Typical: 470mA

@Power 24dBm Typical: 530mA

@Power 24dBm Typical: 385mA

@power level #5 Typical: 480mA

@power level #5 Typical: 230mA

@power level #0 Typical: 195mA

@power level #0 Typical: 390mA

@power level #5 Typical: 330mA

@power level #5 Typical: 370mA

58 / 74

LTE-FDD B2

LTE-FDD B3

LTE-FDD B4

LTE-FDD B5

LTE-FDD B7

LTE-FDD B8

LTE-FDD B12

LTE-FDD B13

LTE-FDD B18

LTE-FDD B19 www.simcom.com

DCS1800( 3Rx, 2 Tx )

PCS1900( 3Rx, 2 Tx )

EDGE

GSM850( 1 Rx,4 Tx )

EGSM900( 1 Rx,4 Tx )

DCS1800( 1 Rx,4 Tx )

PCS1900( 1 Rx,4 Tx )

GSM850( 3Rx, 2 Tx )

EGSM900( 3Rx, 2 Tx )

DCS1800( 3Rx, 2 Tx )

PCS1900( 3Rx, 2 Tx )

GSM850( 1 Rx,4 Tx )

EGSM900( 1 Rx,4 Tx )

DCS1800( 1 Rx,4 Tx )

HSDPA data

WCDMA B1

WCDMA B2

WCDMA B5

WCDMA B8

LTE data

LTE-FDD B1

SIM7600 Series Hardware Design V1.08

@power level #0 Typical: 275mA

@power level #0 Typical: 245mA

@power level #8 Typical: 340mA

@power level #8 Typical: 400mA

@power level #2 Typical: 300mA

@power level #2 Typical: 330mA

@power level #8 Typical: 280mA

@power level #8 Typical: 320mA

@power level #2 Typical: 230mA

@power level #2 Typical: 268mA

@power level #8 Typical: 400mA

@power level #2 Typical: 300mA

@Power 24dBm

@Power 23dBm

@Power 24dBm

@Power 24dBm

Typical: 478mA

Typical: 475mA

Typical: 480mA

Typical: 430mA

@5MHz 22.3dBm

Typical: 577mA

@10MHz 22.4dBm

Typical: 590mA

@20MHz 22.4dBm

Typical: 630mA

@5MHz 22.1dBm

Typical: 515mA

@10MHz 22.4dBm

Typical: 544mA

@20MHz 22.3dBm

Typical:575mA

@5MHz 22.2dBm

Typical: 479mA

@10MHz 22.1dBm

Typical: 498mA

@20MHz 22.1dBm

Typical: 530mA

@5MHz 22.0dBm

Typical: 527mA

@10MHz 22.1dBm

Typical: 559mA

@20MHz 22.6dBm

Typical: 555mA

@5MHz 22.2dBm

Typical: 610mA

@10MHz 22.1dBm

Typical: 600mA

@20MHz 22.1dBm

Typical: 630mA

@5MHz 22.2dBm

Typical: 650mA

@10MHz 22.1dBm

Typical: 650mA

@20MHz 22.1dBm

Typical: 630mA

@5MHz 22.8dBm

Typical: 644mA

@10MHz 22.8dBm

Typical: 646mA

@5MHz 22.7dBm

Typical: 493mA

@10MHz 22.7dBm

Typical: 510mA

@5MHz 21.9dBm

Typical: 505mA

@10MHz 22.0dBm

Typical: 497mA

@5MHz 21.3dBm

Typical: 531mA

@10MHz 22.5dBm

Typical: 523mA

@15MHz 22.6dBm

Typical: 570mA

@5MHz 22.4dBm

Typical: 532mA

@10MHz 22.3dBm

Typical: 541mA

@15MHz 22.5dBm

Typical: 590mA

59 / 74

LTE-FDD B20

LTE-FDD B26

LTE-FDD B28

LTE-TDD B38

LTE-TDD B40

LTE-TDD B41

SIM7600 Series Hardware Design V1.08

@5MHz 21.8dBm

Typical: 579mA

@10MHz 21.8dBm

Typical: 590mA

@20MHz 21.8dBm

Typical: 600mA

@5MHz 22.4dBm

Typical: 525mA

@10MHz 22.7dBm

Typical: 570mA

@15MHz 22.3dBm

Typical: 580mA

@5MHz 22.4dBm

Typical: 612mA

@10MHz 22.5dBm

Typical: 510mA

@20MHz 22.4dBm

Typical: 670mA

@5MHz 21.8dBm

Typical: 370mA

@10MHz 21.8dBm

Typical: 380mA

@20MHz 21.8dBm

Typical: 403mA

@5MHz 21.5dBm

Typical: 407mA

@10MHz 21.7dBm

Typical: 416mA

@20MHz 21.7dBm

Typical: 444mA

@5MHz 21.6dBm

Typical: 390mA

@10MHz 21.7dBm

Typical: 396mA

@20MHz 21.7dBm

Typical: 420mA

5.5 ESD Notes

Module is sensitive to ESD in the process of storage, transporting, and assembling. When module is mounted on the users’ mother board, the ESD components should be placed beside the connectors which human body may touch, such as USIM card holder, audio jacks, switches, keys, etc. The following table shows the module ESD measurement performance without any external ESD component.

Table 43: The ESD performance measurement table (Temperature: 25 ℃ , Humidity: 45%)

Part

VBAT, GND

Antenna port

USB

UART

Other PADs

Contact discharge Air discharge

+/-4K +/-8K

+/-4K +/-8K

+/1 K

+/1 K

+/-1K

+/2 K

+/2 K

+/-2K

Part

VBAT, GND

Antenna port

USB

UART

Other PADs www.simcom.com

60 / 74

SIM7600 Series Hardware Design V1.08

6 SMT Production Guide

6.1 Top and Bottom View of Module

6.2 Label Information

Figure 40: Top and bottom view of module www.simcom.com

Figure 41: Label information

61 / 74

SIM7600 Series Hardware Design V1.08

Table 44: The description of label information

D

E

B

C

F

No.

A

Description

LOGO

Module part number

Project name

Serial number

International mobile equipment identity

QR code

6.3 Typical SMT Reflow Profile

SIMCom provides a typical soldering profile. Therefore, the soldering profile shown below is only a generic recommendation and should be adjusted to the specific application and manufacturing constraints.

Figure 42: The ramp-soak-spike reflow profile of module

For more details about secondary SMT, please refer to the document [21].

6.4 Moisture Sensitivity Level (MSL)

Module is qualified to Moisture Sensitivity Level (MSL) 3 in accordance with JEDEC J-STD-033. If the prescribed time limit is exceeded, users should bake module for 192 hours in drying equipment (<5% RH) at

40+5/-0°C, or 8 hours at 120+5/-5°C. Note that plastic tray is not heat-resistant, and only can be baked at

45° C.

www.simcom.com

62 / 74

SIM7600 Series Hardware Design V1.08

IPC / JEDEC J-STD-033 standard must be followed for production and storage.

6.5 Recommend dimensions of SMT stencil

www.simcom.com

Figure 43: Recommend SMT stencil

63 / 74

SIM7600 Series Hardware Design V1.08

6.6 Stencil Foil Design Recommendation

The recommended thickness of stencil foil is more than 0.15mm.

www.simcom.com

64 / 74

7 Packaging

Module support tray packaging.

SIM7600 Series Hardware Design V1.08

Module tray drawing ：

Figure 44: packaging diagram www.simcom.com

Figure 45: Tray drawing

65 / 74

Table 46: Tray size

Length

（

±3mm

）

242.0

Small carton drawing ：

Width

（

±3mm

）

161.0

SIM7600 Series Hardware Design V1.08

Number

15

Figure 46: Small carton drawing

Table 47: Small Carton size

Length

（

±10mm

）

Width

（

±10mm

）

Height

（

±10mm

）

270 180 120

Number

15*20=300

Big carton drawing ：

Figure 47: Big carton drawing

Table 48: Big Carton size

Length

（

±10mm

）

Width

（

±10mm

）

Height

（

±10mm

）

380 280 280 www.simcom.com

Number

300*4=1200

66 / 74

8 Appendix

8.1 Reference Design

Refer to < SIM7600 Reference Design V1.X.pdf > for the details.

SIM7600 Series Hardware Design V1.08

www.simcom.com

Figure 48: Reference design

67 / 74

SIM7600 Series Hardware Design V1.08

8.2 Coding Schemes and Maximum Net Data Rates over Air Interface

Table 49: Coding Schemes and Maximum Net Data Rates over Air Interface

Multislot definition(GPRS/EDGE)

Slot class

7

8

5

6

9

10

3

4

1

2

11

12

GPRS coding scheme

CS 1 = 9.05 kb/s / time slot

CS 2 = 13.4 kb/s / time slot

CS 3 = 15.6 kb/s / time slot

CS 4 = 21.4 kb/s / time slot

3

4

3

4

4

4

2

3

2

3

DL slot number UL slot number Active

1 1 2

2 1 3

3

1

2

2

3

4

2

2

2

1

4

5

5

5

5

5

4

4

3

4

Max data rata

（

4 slots

）

36.2 kb/s

53.6 kb/s

62.4 kb/s

85.6 kb/s

slot

Modulation type

GMSK

GMSK

GMSK

GMSK

EDGE coding scheme

MCS 1 = 8.8 kb/s/ time slot

MCS 2 = 11.2 kb/s/ time slot

MCS 3 = 14.8 kb/s/ time slot

MCS 4 = 17.6 kb/s/ time slot

MCS 5 = 22.4 kb/s/ time slot

MCS 6 = 29.6 kb/s/ time slot

MCS 7 = 44.8 kb/s/ time slot

MCS 8 = 54.4 kb/s/ time slot

MCS 9 = 59.2 kb/s/ time slot

HSDPA device category

Category 1

Category 2

Category 3

Category 4

Category 5

Category 6

Max data rata

（

4 slots

）

35.2 kb/s

44.8 kb/s

59.2 kb/s

70.4 kb/s

89.6 kb/s

118.4 kb/s

179.2 kb/s

217.6 kb/s

236.8 kb/s

Max data rate

（

peak

）

1.2Mbps

1.2Mbps

1.8Mbps

1.8Mbps

3.6Mbps

3.6Mbps

Modulation type

GMSK

GMSK

GMSK

GMSK

8PSK

8PSK

8PSK

8PSK

8PSK

Modulation type

16QAM,QPSK

16QAM,QPSK

16QAM,QPSK

16QAM,QPSK

16QAM,QPSK

16QAM,QPSK www.simcom.com

68 / 74

Category 7

Category 8

Category 9

Category 10

Category 11

Category 12

Category 13

Category 14

Category 15

Category 16

Category 17

Category 18

Category 19

Category 20

Category 21

Category 22

Category 23

Category 24

HSUPA device category

Category 1

Category 2

Category 3

Category 4

Category 5

Category 6

LTE-FDD device category

(Downlink)

Category 1

Category 2

Category 3

Category 4

LTE-FDD device category

(Uplink)

Category 1

Category 2

Category 3

Category 4

7.2Mbps

7.2Mbps

10.2Mbps

14.4Mbps

0.9Mbps

1.8Mbps

17.6Mbps

21.1Mbps

23.4Mbps

28Mbps

23.4Mbps

28Mbps

35.5Mbps

42Mbps

23.4Mbps

28Mbps

35.5Mbps

42.2Mbps

Max data rate

（

peak

）

0.96Mbps

1.92Mbps

1.92Mbps

3.84Mbps

3.84Mbps

5.76Mbps

Max data rate

（

peak

）

10Mbps

50Mbps

100Mbps

150Mbps

Max data rate

（

peak

）

5Mbps

25Mbps

50Mbps

50Mbps

SIM7600 Series Hardware Design V1.08

16QAM,QPSK

16QAM,QPSK

16QAM,QPSK

16QAM,QPSK

QPSK

QPSK

64QAM

64QAM

16QAM

16QAM

64QAM

64QAM

64QAM

64QAM

16QAM

16QAM

64QAM

64QAM

Modulation type

QPSK

QPSK

QPSK

QPSK

QPSK

QPSK

Modulation type

QPSK/16QAM/64QA

M

QPSK/16QAM/64QA

M

QPSK/16QAM/64QA

M

QPSK/16QAM/64QA

M

Modulation type

QPSK/16QAM

QPSK/16QAM

QPSK/16QAM

QPSK/16QAM www.simcom.com

69 / 74

SIM7600 Series Hardware Design V1.08

8.3 Related Documents

Table 50: Related Documents

NO Title

[1]

[2]

SIM7500_SIM7600 Series_AT

Command Manual_V1.xx

ITU-T Draft new recommendationV.25ter

[3] GSM 07.07

[4] GSM 07.10

[5]

[6]

[7]

[8]

[9]

[10]

[11]

[12]

[13]

[14]

[15]

[16]

GSM 07.05

GSM 11.14

GSM 11.11

GSM 03.38

GSM 11.10

3GPP TS 51.010-1

3GPP TS 34.124

3GPP TS 34.121

3GPP TS 34.123-1

3GPP TS 34.123-3

EN 301 908-02 V2.2.1

EN 301 489-24 V1.2.1

www.simcom.com

Description

AT Command Manual

Serial asynchronous automatic dialing and control

Digital cellular telecommunications (Phase 2+); AT command set for GSM Mobile Equipment (ME)

Support GSM 07.10 multiplexing protocol

Digital cellular telecommunications (Phase 2+); Use of Data

Terminal Equipment – Data Circuit terminating Equipment

(DTE – DCE) interface for Short Message Service (SMS) and

Cell Broadcast Service (CBS)

Digital cellular telecommunications system (Phase 2+);

Specification of the SIM Application Toolkit for the Subscriber

Identity Module – Mobile Equipment (SIM – ME) interface

Digital cellular telecommunications system (Phase 2+);

Specification of the Subscriber Identity Module – Mobile

Equipment (SIM – ME) interface

Digital cellular telecommunications system (Phase 2+);

Alphabets and language-specific information

Digital cellular telecommunications system (Phase 2) ；

Mobile Station (MS) conformance specification ； Part 1:

Conformance specification

Digital cellular telecommunications system (Release 5);

Mobile Station (MS) conformance specification

Electromagnetic Compatibility (EMC) for mobile terminals and ancillary equipment.

Electromagnetic Compatibility (EMC) for mobile terminals and ancillary equipment.

Technical Specification Group Radio Access Network;

Terminal conformance specification; Radio transmission and reception (FDD)

User Equipment (UE) conformance specification; Part 3:

Abstract Test Suites.

Electromagnetic compatibility and Radio spectrum Matters

(ERM); Base Stations (BS) and User Equipment (UE) for

IMT-2000. Third Generation cellular networks; Part 2:

Harmonized EN for IMT-2000, CDMA Direct Spread

(UTRA FDD) (UE) covering essential requirements of article

3.2 of the R&TTE Directive

Electromagnetic compatibility and Radio Spectrum Matters

(ERM); Electromagnetic Compatibility (EMC) standard for radio equipment and services; Part 24: Specific conditions for

70 / 74

SIM7600 Series Hardware Design V1.08

[17]

[18]

[19]

[20]

[21]

[22]

[23]

[24]

[25]

[26]

[27]

IEC/EN60950-1(2001)

3GPP TS 51.010-1

GCF-CC V3.23.1

2002/95/EC

IMT-2000 CDMA Direct Spread (UTRA) for Mobile and portable (UE) radio and ancillary equipment

Safety of information technology equipment (2000)

Digital cellular telecommunications system (Release 5);

Mobile Station (MS) conformance specification

Global Certification Forum - Certification Criteria

Directive of the European Parliament and of the Council of 27

January 2003 on the restriction of the use of certain hazardous substances in electrical and electronic equipment

(RoHS)

Module secondary SMT Guidelines

This document describes how to use UART interface of

SIMCom modules.

Module secondary-SMT-UGD-V1.xx

SIM7X00

Series_UART_Application

Note_V1.xx

SIM7100_SIM7500_SIM7600

Series_USB

AUDIO_Application

Note_V1.xx

SIM7X00

Series_GPS_Application

Note_V1.xx

Antenna design guidelines for diversity receiver system

SIM7100_SIM7500_SIM7600_

Sleep Mode_Application

Note_V1.xx

7600CE-LAN-Reference

Design V1.0

USB AUDIO Application Note

GPS Application Note

Antenna design guidelines for diversity receiver system

Sleep Mode Application Note

HSIC Application Note www.simcom.com

71 / 74

SIM7600 Series Hardware Design V1.08

8.4 Terms and Abbreviations

Table 51: Terms and Abbreviations

Abbreviation

ADC

LTE

MO

MS

MT

GNSS

GPRS

GPS

GSM

HR

HSPA

I2C

IMEI

ESD

ETS

EVDO

FCC

FD

FDMA

FR

GMSK

DRX

DSP

DTE

DTR

DTX

EFR

EGSM

EMC

ARP

BER

BTS

CS

CSD

CTS

DAC

Description

Analog-to-Digital Converter

Antenna Reference Point

Bit Error Rate

Base Transceiver Station

Coding Scheme

Circuit Switched Data

Clear to Send

Digital-to-Analog Converter

Discontinuous Reception

Digital Signal Processor

Data Terminal Equipment (typically computer, terminal, printer)

Data Terminal Ready

Discontinuous Transmission

Enhanced Full Rate

Enhanced GSM

Electromagnetic Compatibility

Electrostatic Discharge

European Telecommunication Standard

Evolution Data Only

Federal Communications Commission (U.S.)

SIM fix dialing phonebook

Frequency Division Multiple Access

Full Rate

Gaussian Minimum Shift Keying

Global Navigation Satellite System

General Packet Radio Service

Global Positioning System

Global Standard for Mobile Communications

Half Rate

High Speed Packet Access

Inter-Integrated Circuit

International Mobile Equipment Identity

Long Term Evolution

Mobile Originated

Mobile Station (GSM engine), also referred to as TE

Mobile Terminated www.simcom.com

72 / 74

SMS

SPI

SMPS

TDMA

TE

TX

UART

VSWR

SM

NC

EDGE

HSDPA

HSUPA

ZIF

WCDMA

VCTCXO

USIM

UMTS

NMEA

PAP

PBCCH

PCB

PCS

RF

RMS

RTC

SIM

SIM7600 Series Hardware Design V1.08

National Marine Electronics Association

Password Authentication Protocol

Packet Switched Broadcast Control Channel

Printed Circuit Board

Personal Communication System, also referred to as GSM 1900

Radio Frequency

Root Mean Square (value)

Real Time Clock

Subscriber Identification Module

Short Message Service serial peripheral interface

Switched-mode power supply

Time Division Multiple Access

Terminal Equipment, also referred to as DTE

Transmit Direction

Universal Asynchronous Receiver & Transmitter

Voltage Standing Wave Ratio

SIM phonebook

Not connect

Enhanced data rates for GSM evolution

High Speed Downlink Packet Access

High Speed Uplink Packet Access

Zero intermediate frequency

Wideband Code Division Multiple Access

Voltage control temperature-compensated crystal oscillator

Universal subscriber identity module

Universal mobile telecommunications system www.simcom.com

73 / 74

SIM7600 Series Hardware Design V1.08

8.5 Safety Caution

Table 52: Safety Caution

Marks Requirements

When in a hospital or other health care facility, observe the restrictions about the use of mobiles. Switch the cellular terminal or mobile off, medical equipment may be sensitive and not operate normally due to RF energy interference.

Switch off the cellular terminal or mobile before boarding an aircraft. Make sure it is switched off. The operation of wireless appliances in an aircraft is forbidden to prevent interference with communication systems. Forgetting to think much of these instructions may impact the flight safety, or offend local legal action, or both.

Do not operate the cellular terminal or mobile in the presence of flammable gases or fumes. Switch off the cellular terminal when you are near petrol stations, fuel depots, chemical plants or where blasting operations are in progress. Operation of any electrical equipment in potentially explosive atmospheres can constitute a safety hazard.

Your cellular terminal or mobile receives and transmits radio frequency energy while switched on. RF interference can occur if it is used close to TV sets, radios, computers or other electric equipment.

Road safety comes first! Do not use a hand-held cellular terminal or mobile when driving a vehicle, unless it is securely mounted in a holder for hands free operation. Before making a call with a hand-held terminal or mobile, park the vehicle.

GSM cellular terminals or mobiles operate over radio frequency signals and cellular networks and cannot be guaranteed to connect in all conditions, especially with a mobile fee or an invalid SIM card. While you are in this condition and need emergent help, please remember to use emergency calls. In order to make or receive calls, the cellular terminal or mobile must be switched on and in a service area with adequate cellular signal strength.

Some networks do not allow for emergency call if certain network services or phone features are in use (e.g. lock functions, fixed dialing etc.). You may have to deactivate those features before you can make an emergency call.

Also, some networks require that a valid SIM card be properly inserted in the cellular terminal or mobile.

www.simcom.com

74 / 74