SIMCom SIM7090G Hardware Design
Advertentie
Advertentie
SIM7090G
Hardware Design
LPWA Module
SIMCom Wireless Solutions Limited
Building B, SIM Technology Building, No.633, Jinzhong Road
Changning District, Shanghai P.R. China
Tel: 86-21-31575100 [email protected]
www.simcom.com
SIM7090G Hardware Design V1.02
Document Title:
Version:
Date:
Status:
SIM7090G Hardware Design
V1.02
2020-08-26
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 B, SIM Technology Building, No.633 Jinzhong 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.
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SIM7090G Hardware Design V1.02
Version History
Date Version Description of change
2020-01-22 1.00
Origin
2020-07-02 1.01
2020-08-26 1.02
Modify the document content format.
Update GPS power consumption information
Author
Hongjun Tu
Xianjing Zhao
Hongjun.Tu
Hongjun.Tu
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SIM7090G Hardware Design V1.02
Contents
Contents
4
Table Index
6
Figure Index
7
1 Introduction
8
2 Package Information
12
3 Interface Application
20
4 RF Specifications
42
5 Electrical Specifications
52
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SIM7090G Hardware Design V1.02
6 SMT Production Guide
61
7 Packaging
67
8 Appendix
70
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SIM7090G Hardware Design V1.02
Table Index
TABLE 26: MAXIMUM POWER REDUCTION (MPR) FOR UE CATEGORY NB2&M1 POWER CLASS 5 .
TABLE 40: THE ESD PERFORMANCE MEASUREMENT (TEMPERATURE: 25 ℃ , HUMIDITY: 45%) .......
TABLE 47: CODING SCHEMES AND MAXIMUM NET DATA RATES OVER AIR INTERFACE ....................
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SIM7090G Hardware Design V1.02
Figure Index
FIGURE 17: REFERENCE CIRCUIT OF PCM APPLICATION WITH AUDIO CODEC ...................................
FIGURE 28: RF TRACE SHOULD BE FAR AWAY FROM OTHER HIGH SPEED SIGNAL LINES .............
FIGURE 29: THE DISTANCE BETWEEN GND TO THE INNER CONDUCTOR OF SMA ..............................
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SIM7090G Hardware Design V1.02
1 Introduction
This document describes the electronic specifications, RF specifications, interfaces, mechanical characteristics and testing results of the SIMCom SIM7090G module. With the help of this document and other SIM7090G software application notes/user guides, users can understand and use SIM7090G module to design and develop applications quickly.
Product Outline
The SIM7090G modules support LTE CAT-M1, LTE CAT-NB1/NB2.
The physical dimension of SIM7090G is 14.8mm×12.8mm×2.0 mm.
Table 1: SIM7090G frequency bands and air interface
Network Type
LTE-FDD *
HD-FDD
GNSS
Band
Category
LTE-FDD B1
LTE-FDD B2
LTE-FDD B3
LTE-FDD B4
LTE-FDD B5
LTE-FDD B8
LTE-FDD B12
LTE-FDD B13
LTE-FDD B14
LTE-FDD B18
LTE-FDD B19
LTE-FDD B20
LTE-FDD B25
LTE-FDD B26
LTE-FDD B27
LTE-FDD B28
LTE-FDD B66
LTE-FDD B71
LTE-FDD B85
GPS
GLONASS
BeiDou
SIM7090G
M1
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NB1/NB2
SIM7090G Hardware Design V1.02
Galileo
NOTE
Galileo is default closed in software. But users can open it via AT command “AT+CGNSMOD”. For more information about these AT commands, please refer to Document [1]
Hardware Interface Overview
The interfaces are described in detail in the next chapters include:
Power Supply
USB Interface
UART Interface
SIM Interface
ADC
LDO Power Output
PCM Interface
I2C Interface
SPI Interface
RF control Interface
GPIOs
Antenna Interface
Hardware Block Diagram
The block diagram of the SIM7090G module is shown in the figure below.
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SIM7090G Hardware Design V1.02
Functional Overview
Figure 1: SIM7090G block diagram
Table 2: General features
Feature Implementation
Power supply Power supply voltage 2.7V
～ 4.8V. Default :3.8V
Power saving
Radio frequency bands
Current in sleep mode: 0.78mA @DRX2.56S
Current in PSM mode: 3uA
Please refer to the table 1
Transmitting power LTE power class: 5 (0.125W).
Data Transmission
Throughput
LTE CAT M1: 589 Kbps (DL), 1119 Kbps (UL)
LTE CAT NB2: 127Kbps (DL) ,158 Kbps (UL)
Antenna
GNSS
LTE main antenna.
GNSS antenna.
GNSS engine (GPS, GLONASS, BD and Galileo).
Protocol: NMEA.
SIM interface
Digital audio feature
SPI interface
Support identity card: 1.8V only.
Support PCM interface.
Only support PCM master mode and short frame sync
Support for serial data bus SPI, only used during DAM application secondary www.simcom.com
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SIM7090G Hardware Design V1.02
development.
UART interface
One channel full-function UART by default can be used for AT communication.
Baud rate: 300bps to 3686400bps. Default rate is 0bps (auto baud rate).
Support auto baud rate, but only limited to 9600, 19200, 38400, 57600 and
115200 bps.
Support RTS/CTS hardware handshake.
DBG_UART can be used for software debug.
GNSS_UART can also be configured as a GNSS NMEA data output port.
USB USB 2.0 high speed interface.
Firmware upgrade Firmware upgrade over USB interface
Physical characteristics
Size: 14.8×12.8×2.0 mm
Weight: 0.8g ± 0.2g
Temperature range operation temperature: -40 ℃ ~ +85 ℃
Storage temperature -45°C to + 90°C www.simcom.com
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SIM7090G Hardware Design V1.02
2 Package Information
2.1. Pin Assignment Overview
The module has 77 pins and provides all the hardware interfaces of the module.
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Figure 2: Pin assignment overview
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SIM7090G Hardware Design V1.02
Table 3: Pin definition
Pin
No.
1
Pin Name
GPIO1
13
16
19
22
4
7
10
25
28
31
34
37
GNSS_UART_RXD
TXD
USB_DM
USIM_CLK
USIM_VDD
VBAT
GND
GND
GND
GND
PCM_OUT
I2C_SCL
40
43
46
49
52
55
58
SPI_MOSI
GND
PWRKEY
RESERVED
GND
GND
73
76
79
82
61
64
67
70
GND
DBG_RXD
EXT_PWR_EN
RESERVED
RESERVED
GND
RI
NETLIGHT
85
88
91
94
RESERVED
GND
GND
RESERVED
RESERVED
97 NC
100 NC
Pin
No.
2
Pin Name
PCM_IN
14
17
20
23
5
8
11
26
29
32
35
38
I2C_SDA
SPI_MISO
USB_DP
USIM_DATA
ADC0
VBAT
GND
ANT_MAIN
GRFC_1
ANT_GNSS
PCM_SYNC
RTS
41
44
47
50
53
56
59
W_DISABLE#
USIM_PRESENCE
GND
RESERVED
GND
GND
74
77
80
83
62
65
68
71
RESERVED
DTR
GND
RESERVED
RESERVED
GND
AP_READY
RESERVED
86
89
92
95
RESERVED
GND
GND
RESERVED
NC
98 NC
101 NC
Pin Name
PCM_CLK
RXD
SPI_CLK
USB_VBUS
USIM_RST
ADC1
VDD_EXT
GND
GND
GND
GPIO33
GNSS_UART_TXD
CTS
USB_VDDA_3P3
RESET_N
RESERVED
RESERVED
GND
GPIO57
DBG_TXD
SPI_CS_N
GND
RESERVED
GRFC_2
GND
STATUS
RESERVED
GND
USB_BOOT
DCD
RESERVED
NC
NC
Pin
No.
3
87
90
93
96
99
75
78
81
84
63
66
69
72
51
54
57
60
39
42
45
48
27
30
33
36
15
18
21
24
6
9
12 www.simcom.com
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SIM7090G Hardware Design V1.02
2.2. Pin Description
Table 4: IO parameters definition
Pin type Description
PI
PO
AI
AIO
I/O
DI
DO
DOH
DOL
PU
PD
OD
Power input
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
Open Drain
Table 5: Pin description
Pin name
Pin
No.
Power supply
VBAT
Default status
19,20 PI
VDD_EXT 21 PO
Description
Power supply, voltage range:
2.7V
～ 4.8V.
LDO power output 1.8V for other external circuits with
Max 50mA current output.
GND
System Control
22,23,
24,25,
27,28,
30,31,
43,52,
53,54,
55,56,
58,65,
66,73,
74,75,
84,85,
86,88,
89
Ground
PWRKEY 46 DI,PU
System power on/off control input, active low.
The efficient input low level must be below 0.4V.
The efficient input high level must be higher than 1.0V.
After the PWRKEY continues
Comment
This power supple only use for external GPIO pulling up or level shift circuit.
If unused, keep it open.
The level is 1.5V when this
PIN is floating;
PWRKEY should never be pulled down to GND permanently.
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RESET_N
SIM interface
USIM_DATA
USIM_RST
USIM_CLK
USIM_VDD
45
14
15
13
16
USIM_PRESENC
E
USB
USB_VBUS
44
12
USB_DP 11
USB_DM 10
USB_VDDA_3P3 42
EXT_PWR_EN 64
UART interface
TXD 7
RXD
RTS
CTS
DCD
DTR
6
38
39
90
62
RI
DBG_TXD
76
60
DBG_RXD 61
GNSS_UART_TXD 36
GNSS_UART_RXD 4
I2C interface
I2C_SDA 5 www.simcom.com
SIM7090G Hardware Design V1.02
DI,PD
I/O
I/O
PI
DO
DI,PU
I/O,PU
DO
DO
PO
DI to pull down more than 15S, the system will automatically reset. Therefore, long-term grounding is not recommended
Reset the module
V
ILmax
=0.4V
1.8V power domain. If unused, keep this pin open.
USIM Card data I/O, which has been pulled up via a 20KR 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
SIM card type automatically.
Its output current is up to
50mA.
USIM card insertion detection
All lines of USIM interface should be protected against
ESD.
1.8V
power domain.
If unused, keep this pin open.
USB detection
V
IHmax
=1.8V
V
IHmin
=1.3V
Positive line of the differential, bi-directional USB signal.
Negative line of the differential, bi-directional USB signal.
Power for USB PHY circuit.
V norm
=3.3V
USB_VDDA_3P3 voltage enable signal.
1.8V power domain
Software download interface.
It is recommended to reserve interfaces or test points.
USB_VDDA_3P3 and
EXT_PWR_EN pins are used for USB PHY circuits.
DOH Transmit Data
DI,PU Receive Data
DI,PU Request to send
DOH Clear to Send
DOH Carrier detects
DI,PU DTE get ready
DOH Ring Indicator
DOH
DI,PU
Debug UART, the boot log will be output during boot up.
DOH
DI,PU
It can be configured as NMEA data output for GNSS.
1.8V power domain. If unused, keep it open.
1.8V power domain. If unused, keep them open.
1.8V power domain. If unused, keep them open.
OD I2C serial data. Used for If unused, keep open, or else
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I2C_SCL
PCM interface
PCM_DIN
PCM_OUT
PCM_CLK
PCM_SYNC
SPI interface
SPI_CS_N
SPI_MOSI
SPI_CLK
SPI_MISO
GPIO
NETLIGHT
STATUS
37
9
8
AP_READY 77 www.simcom.com
2
34
3
35
63
40
79
78
OD
DI
DO
DO
DO
DO
DO
DO
DI
DO
DO
GPIO1
GPIO33
1
33
GPIO57
RF interface
ANT _GNSS
57
32
ANT _MAIN 26
RF control interface
GRFC_2 72
GRFC_1
Other interface
29
IO
IO
IO
IO
IO
AI
AIO
W_DISABLE# 41 DI
DI
SIM7090G Hardware Design V1.02
external codec. External pull-up resistor is required.
I2C serial clock. Used for external codec. External pull-up resistor is required.
pull them up via 1KΩ resistors to the VDD_EXT.
PCM data input.
PCM data output.
PCM data bit clock.
PCM data frame sync signal.
1.8V
power domain.
unused, keep this pin open.
If
Chip Select
SPI master-out slave-in
Note: It cannot be pulled up before booting.
Otherwise it will affect the normal boot.
Bus clock output
SPI master-in slave-out
1.8V
power domain.
If unused, please keep them open.
SPI_MOSI DO NOT PULL
UP DURING NORMAL
POWER UP!
Indicate the module’s network activity status.
Indicate the module’s operation status.
High level: Power on and firmware ready.
Low level: Power off.
General-purpose input/output interface
General-purpose input/output interface
General-purpose input/output interface
1.8V power domain.
If unused, keep them open.
1.8V power domain.
If unused, keep them open.
GNSS antenna interface
MAIN antenna interface
50Ω impedance.
If unused, keep this pin open.
50Ω impedance
GRFC dedicated signals lines
VC2
GRFC dedicated signals lines
VC1
Airplane mode control
Application processor sleep
1.8V power domain.
It can be connected to external antenna tuner to enhance can be suspended.
antenna performance. If not used, it
1.8V power domain.
Pulled up by default. When it is in low voltage level, the module can enter into airplane mode.
If unused, keep this pin open.
1.8V power domain.
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BOOT_CFG
ADC0
ADC1
RESERVED
NC
SIM7090G Hardware Design V1.02
87
17
18
48,49,
50,51,
59,67,
68,69,
70,71,
80,81,
82,83,
91,92,
93,94
95,96,
97,98,
99,
100,
101
DI,PD
AI
AI state detection
If it needs to enter into forced
USB download mode, it must be pulling up this pin to VDD_EXT before press the PWRKEY.
If it needs to boot up normally, please keep this pin open.
Analog-digital converter input.
voltage range: 0V ～ 1.875V.
If unused, keep this pin open.
1.8V power domain.
Reserve a test points for it.
Keep it open.
DO NOT PULL UP DURING
NORMAL POWER UP!
If unused, keep it open.
Reserved
No connection.
Keep it open
Keep it open
NOTE
Please reserve a test point for BOOT_CFG and VDD_EXT. If there is no USB connector, please also reserve a test point for USB_VBUS, USB_DP, and USB_DM for Firmware upgrade.
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2.3. Mechanical Information
The following figure shows the package outline drawing of SIM7090G.
SIM7090G Hardware Design V1.02
Figure 3: Dimensions (Unit: mm) www.simcom.com
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2.4. Footprint Recommendation
SIM7090G Hardware Design V1.02
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Figure 4: Footprint recommendation (Unit: mm)
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SIM7090G Hardware Design V1.02
3 Interface Application
Power Supply
Pin 19 and pin 20 are VBAT power input.
On VBAT pads, when module works on CAT-M1 or NB-IoT mode, the ripple current is up to 0.5A typically.
For steady voltage, the power supply capability must be up to 0.5A.
Table 6: VBAT pins electronic characteristic
Symbol
VBAT
I
VBAT(peak)
I
VBAT(average)
I
VBAT(sleep)
I
VBAT(power-off)
I
VBAT(PSM)
Description
Module power voltage
Module power peak current in CAT-M1 and NB-IoT emission mode.
Module power average current in normal mode
Power supply current in sleep mode
Module power current in power off mode.
Module power current in PSM mode.
-
-
-
Min.
Typ.
Max. Unit
2.7
3.8
4.8
V
0.5
Please refer to the chapter 5.4
-
3
-
-
15
A uA uA
3.1.1 Power Supply Design Guide
In the user's design, special attention must be paid to the design of the power supply to ensure that the drop of VBAT is not less than 2.5V even when the module's current consumption reaches the instantaneous maximum. If the voltage drop is less than 2.5V, the module may shut down due to the low voltage.
The following figure shows the recommended circuit.
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SIM7090G Hardware Design V1.02
Figure 5: Power supply application circuit
In addition, for ESD protection, it is suggested to add a TVS diode near the VBAT PINs. These capacitors should be put as close as possible to VBAT pads. Also, users should keep VBAT trace on circuit board wider than 1 mm to minimize PCB trace impedance.
NOTE
1. The customer's circuit design must have the function that the master can control the power off of the module. The module can be shut down or restarted normally. Only when the module is abnormal and cannot be shut down or restarted normally can the power be turned off.
2. When the module is working normally, do not cut off the power supply of the module VBAT directly to avoid damage to the internal flash of the module. It is strongly recommended to turn off the module through PWRKEY or AT command before disconnecting the module VBAT power.
3.1.2 Voltage Monitor
To monitor the VBAT voltage, the AT command “AT+CBC” can be used.
AT command “AT+CBATCHK=1” can be used to enable the overvoltage warning function and the under-voltage warning function. The default value of the overvoltage warning function in the software is
4.85V, and the default value of the under-voltage warning function is 2.8V. If the power supply for VBAT pins is up 4.85V or under 2.8V, module will be warning.
The AT command “AT+CBATCHK=1” also can be used to enable the overvoltage power-off function and the under-voltage power-off function. The default value of the overvoltage power-off function is 4.9V, and the default value of the under-voltage power-off function is 2.5V. If the VBAT voltage is up 4.9V or under 2.5V, module will be power off.
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SIM7090G Hardware Design V1.02
NOTE
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].
Power on/Power off/Reset Function
3.2.1 Turn on Module Using the PWRKEY Pin
SIM7090G can be powered on by briefly pulling the PWRKEY pin 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.
The PWRKEY pin has its own reset function. The reset time is determined by the internal timer (default is 15 seconds). After the PWRKEY is pulled low, the module will be reset after 15 seconds. Therefore, it is not recommended to connect PWRKEY to GND all the time in external circuit design.
Please refer to the following figure for the recommended reference circuit.
Figure 6: Reference power on/off circuit
The power-on scenarios are illustrated in the following figure.
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SIM7090G Hardware Design V1.02
Figure 7: Power on timing sequence
Table 7: Power on timing and electronic characteristic
Symbol
T on
T on(Vdd)
T on(status)
T on(uart)
T on(usb)
V
IH
V
IL
Parameter
The time of active low level impulse of PWRKEY pin to power on module
The time from power-on issue to VDD_EXT pin output high level.
The time from power-on issue to STATUS pin output high level(indicating power up ready )
The time from power-on issue to UART port ready
The time from power-on issue to USB port ready
Input high level voltage on PWRKEY pin
Input low level voltage on PWRKEY pin
NOTE
1
Min.
Typ. Max. Unit
15 s
6.9
6.9
7.2
1.0
-0.3
64
-
-
-
1.5
0
-
-
-
1.8
0.4
ms s
V
V s s
1. PWRKEY cannot be shorted all the way to GND.
2. It is recommended to ensure that the VBAT voltage rises and stabilizes before pulling down the
PWRKEY pin to start up.
3. Before turning on the module, be sure to pay attention to the maximum conditions (such as voltage and temperature range) allowed by the module, otherwise exceeding the absolute maximum value of the module may cause permanent damage to the module.
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SIM7090G Hardware Design V1.02
3.2.2 Turn off Module
The following methods can be used to power off SIM7090G.
Method 1: Power off SIM7090G by pulling the PWRKEY pin to ground.
Method 2: Power off SIM7090G by AT command “AT+CPOWD=1”.
Method 3: over-voltage or under-voltage automatic power off. The function can be enabled by AT command “AT+CBATCHK=1”. Default is disabled.
NOTE
For details about “AT+CPOWD” and “AT+CBATCHK”, please refer to Document [1].
It is not recommended to turn off the module by disconnecting VBAT power. Otherwise, there is a risk of damage to the module’s file system.
These procedures will make modules 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.
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Figure 8: Power off timing sequence
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SIM7090G Hardware Design V1.02
Table 8: Power off timing and electronic characteristic
Symbol Parameter
T off
T off(vdd)
T off(status)
T off(uart)
T off(usb)
T off-on
The active low level time pulse on PWRKEY pin to power off module
The time from power-off issue to VDD_EXT pin output low level
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
The time from power-off issue to USB port off
The buffer time from power-off issue to power-on issue
Min.
Time value
Typ.
Max.
1.2
-
Unit s
1.8
1.8
1.8
1.8
2
-
-
-
-
-
-
-
-
-
s s s s s
NOTE
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.
3.2.3 Reset the Module
RESET_N is used to reset the module. The module can be reset by driving RESET_N to a low level voltage for a period of time.
The RESET pin has been pulled up to 1.8V with a resistor internally. So it does not need to be pulled up externally. It is strongly recommended to put an ESD protection diode close to the RESET pin. Please refer to the following figure for the recommended reference circuit.
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SIM7090G Hardware Design V1.02
Figure 9: Reference reset circuit
Table 9: RESET pin electronic characteristic
Symbol
T reset
V
IH
V
IL
Description
The active low level time impulse on RESET pin to reset module
Input high level voltage
Input low level voltage
Min.
Typ. Max. Unit
30
1.2
-0.3
1.8
0
250
1.8
0.3
ms
V
V
NOTE
After RESET_N is pulled low for a timeout, it will cause the module to shut down.
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SIM7090G Hardware Design V1.02
UART Interface
SIM7090G can provide 3 channels serial ports: Main UART, Debug UART and GNSS UART interfaces.
Features of them are illustrated below:
The Main UART interface supports 0, 300, 600, 1200, 2400, 4800, 9600, 19200, 38400, 57600,
115200, 230400, 921600, 2000000, 3000000, 3200000 and 3686400 bps. The rate 0bps marks auto baud rate. And the default is 115200bps. It is used for data transmission and AT command communication, and supports RTS and CTS hardware flow control. The default frame format is
8N1 (8 data bits, no parity, 1 stop bit).
The Debug UART interface supports a fixed baud rate of 115200bps, and is used for software debugging and log output.
The GNSS UART interface supports 115200bps baud rate by default, and is used for GNSS data and NMEA sentences output.
Table 10: Pin Definition of Main UART Interface
Pin Name
DTR
RXD
TXD
CTS
RTS
DCD
RI
Pin No. I/O
62
6
7
39
38
90
76
DI
DI
DO
DO
DI
DO
DO
Description
Data terminal ready. Sleep mode control.
Receive data
Transmit data
Clear to send
Request to send
Data carrier detection
Ring indication signal
Comment
1.8V power domain
1.8V power domain
1.8V power domain
1.8V power domain
1.8V power domain
1.8V power domain
1.8V power domain
Table 11: Pin Definition of Debug UART Interface
Pin Name
DBG_RXD
DBG_TXD
Pin No. I/O
61
60
DI
DO
Description
Receive data
Transmit data
Comment
1.8V power domain
1.8V power domain
Table 12: Pin Definition of GNSS UART Interface
Pin Name
GNSS_UART_RXD
GNSS_UART_TXD
Pin No. I/O
4
36
DI
DO
Description
Receive data
Transmit data
Comment
1.8V power domain
1.8V power domain www.simcom.com
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3.3.1. UART Design Guide
The following figures show the reference design.
SIM7090G Hardware Design V1.02
Figure 10: UART full modem
Driving the host DTR to low level will wake up the module.
AP_READY will detect the sleep state of the host (can be configured to high level or low level detection).
Table 13: UART electronic characteristic
Symbol
V
IH
V
IL
V
OH
V
OL
Description
UART input high level voltage
UART input low level voltage
UART output high level voltage
UART output low level voltage
Min.
Typ. Max. Unit
1.17
-0.3
1.35
0
1.8
0
1.8
0
2.1
V
0.63
V
1.8
V
0.45
V
The SIM7090G 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 following figure shows the voltage matching reference design.
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SIM7090G Hardware Design V1.02
Figure 11: Reference circuit of level shifter IC
Figure 12: Reference circuit with Transistor
NOTE
When it uses the level shifter IC, the pull up resistance on TXD_3.3V, RTS_3.3V, DCD_3.3V and
RI_3.3V should not be less than 47KΩ.
When it uses the transistor, the selection of the transistor must be a high-speed transistor, and the model MMBT3904 is recommended.
3.3.2. RI Behavior
The RI pin description:
The RI pin can be used to interrupt output signal to inform the host controller such as application CPU.
Before that, users must use AT command “AT+CFGRI=1” to enable this function.
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SIM7090G Hardware Design V1.02
Normally RI will keep high level until certain conditions such as receiving SMS, or a URC report coming, then it will output a low level pulse 120ms, in the end, it will become high level.
Figure 13: RI behaviour （ SMS and URC report ）
3.3.3. DTR Behavior
Perform the following operations in turn, and the module will enter sleep mode.
Setting the AT command “AT+CSCLK=1”.
Drive DTR to high level.
In sleep mode, the UART is unavailable. And pulling down DTR can wake up module.
After setting the AT command “AT+CSCLK=0”, SIM7090G will do nothing when the DTR pin is pulling up.
NOTE
For more details of AT commands about UART, please refer to document [1] and [20].
USB Interface
SIM7090G has a USB2.0 interface. The USB interface is used for AT command communication, data transmission, software debugging and firmware upgrade. The following table shows the pin definition of
USB interface.
Table 14: Pin Definition of USB Interface
Pin Name
USB_VBUS
Pin No. I/O
12 PI
Description
USB connection detection
Comment
The input range is www.simcom.com
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SIM7090G Hardware Design V1.02
USB_DP
USB_DM
USB_VDDA_3P3
EXT_PWR_EN
11
10
42
64
IO
IO
PI
DO
USB differential data bus (+)
USB differential data bus (-)
Power supply for USB PHY circuit
External LDO enable of USB
1.3V~1.8V
Require differential impedance of 90Ω
1.8V power domain
The USB interface is recommended to be reserved for firmware upgrade in customers’ design. The following figures illustrate reference designs of USB PHY and USB interface.
Figure 14: Reference Design of USB PHY
The reference circuit refers to the following figure.
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Figure 15: Reference Design of USB Interface
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SIM7090G Hardware Design V1.02
The following principles should be complied with when design the USB interface, so as to meet USB 2.0
specification.
It is important to route the USB signal traces as differential pairs with total grounding. USB requires differential traces with a differential impedance of 90Ω.
Do not route signal traces under crystals, oscillators, magnetic devices and RF signal traces. It is important to route the USB differential traces in inner-layer with ground shielding on not only upper and lower layers but also right and left sides.
Pay attention to the influence of junction capacitance of ESD protection components on USB data lines. Typically, the capacitance value should be less than 3pF.
Keep the ESD protection components as close to the USB connector as possible.
NOTE
The USB interface is strongly recommended to reserve test points.
The USB_DM and USB_DP nets must be traced by 90Ohm+/-10% differential impedance.
SIM Interface
SIM7090G only supports 1.8V SIM Cards.
Table 15: SIM electronic characteristic in 1.8V mode (SIM_VDD=1.8V)
V
IH
V
IL
V
OH
V
OL
Symbol Parameter Min.
SIM_VDD LDO power output voltage 1.75
High-level input voltage
Low-level input voltage
0.65*SIM_VDD
-0.3
High-level output voltage SIM_VDD -0.45
Low-level output voltage 0
-
0
-
0
Typ. Max.
1.8
1.95
SIM_VDD +0.3
0.35*SIM_VDD
SIM_VDD
0.45
NOTE
The module does not support 3V SIM card.
The software does not support the SIM card hot swap function.
V
V
V
V
Unit
V www.simcom.com
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SIM7090G Hardware Design V1.02
3.5.1. SIM 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 SIM peripheral circuit should be close to the SIM card socket. The following figure shows the 6-pin SIM card holder reference circuit.
Figure 16: SIM interface reference circuit
SIM_DATA has been pulled up with a 20KΩ resistor to SIM_VDD in module, so it no need pulled up resistor anymore. SIM_VDD needs a 100nF capacitor close to SIM socket.
SIM_CLK is very important signal, the rise time and fall time of SIM_CLK should be less than 40ns. So the junction capacity of the TVS need to less 50pF.
In order to enhance the reliability and availability of the (U)SIM card in applications. Please follow the guidelines below when designing.
It is recommended to place a 100nF capacitor on the SIM_VDD signal line close to the SIM card holder.
Place TVS near the SIM card holder. The junction capacity of the TVS should not exceed 50pF.
The 22Ω resistor in series between the SIM card holder and the module can enhance the ESD protection performance.
Keep SIM card signals away from RF and VBAT traces.
SIM card signal line traces to avoid branch.
To avoid cross-talk between SIM_DATA and SIM_CLK, keep them away from each other and shield them with surrounded ground. USIM_RST should also be ground shielded.
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SIM7090G Hardware Design V1.02
PCM Interface
SIM7090G provides a PCM interface for external codec, which can be used in master mode with short sync and 16 bits linear format.
Table 16: Pin Definition of PCM Interfaces
Pin Name
PCM_CLK
Pin No.
3
I/O
DO
PCM_SYNC
PCM_IN
PCM_OUT
35
2
34
DO
DI
DO
Description
PCM clock output
PCM frame synchronization output
PCM data input
PCM data output
Comment
1.8V power domain
1.8V power domain
1.8V power domain
1.8V power domain
The following figure shows the external codec reference design.
Figure 17: Reference Circuit of PCM Application with Audio Codec
I2C Interface
SIM7090G provides an I2C interface with clock rate up to 400 kbps. Its operation voltage is 1.8V.
The following figure shows the I2C bus reference design.
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SIM7090G Hardware Design V1.02
Figure 18: I2C reference circuit
The I2C signal has no pull-up resistors in module. So the pulling up resistors 1KR to VDD_EXT is necessary in application circuit.
SPI Interface
SIM7090G supports a set of 4- wire (MISO, MOSI, CS and CLK) SPI interfaces and supports both SPI master mode and SPI slave mode. The maximum clock frequency is up to 50MHz when operating in SPI master mode and up to 25MHz when operating in SPI Slave mode.
Table 17: Pin Definition of SPI Interface
Pin Name
*SPI_MOSI
SPI_MISO
SPI_CS_N
SPI_CLK
Pin No.
40
8
63
9
I/O
DO
DI
DO
DO
Description
SPI master-out slave-in
SPI master-in slave-out
SPI chip select
SPI clock
Comment
1.8V power domain
1.8V power domain
1.8V power domain
1.8V power domain
NOTE
SPI_MOSI is FAST BOOT function before system boot-up, so the level on this pin cannot be high before the system boot-up, otherwise the module will not start normally.
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The following figure shows the SPI bus reference design.
SIM7090G Hardware Design V1.02
Figure 19: SPI master mode circuit
Figure 20: SPI slave mode circuit
NOTE
The SPI_MOSI (49 pin) function is FAST BOOT function before system boot-up, so the level on this pin cannot be high before the system boot-up, otherwise the module will not start normally.
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SIM7090G Hardware Design V1.02
Network status
The NETLIGHT pin is used to control Network Status LED, its reference circuit is shown in the following figure.
Figure 21: NETLIGHT reference circuit
NOTE
The value of the resistor named “R” depends on the LED characteristic.
Table 18: NETLIGHT pin status
NETLIGHT pin status
64ms ON, 800ms OFF
64ms ON, 3000ms OFF
64ms ON, 300ms OFF
OFF
NOTE
Module status
No registered network
Registered network (PS domain registration success)
Data transmit (PPP dial-up state and use of data services such as internal TCP/FTP/HTTP)
Power off or PSM mode
NETLIGHT output low level as “OFF” and high level as “ON”.
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SIM7090G Hardware Design V1.02
ADC interface
SIM7090G has two dedicated ADC pins. They are available for digitizing analog signals such as battery voltage and so on. The input voltage range is from 0V to 1.8v. That is the maximum measurement range of
ADC cannot exceed 1.8V. If the input voltage of ADC PIN exceeds its range, it is necessary to implement the resistance partial pressure on the hardware
Table 19: Pin Definition of ADC Interfaces
Pin Name Pin No.
I/O
ADC0
ADC1
17
18
AI
AI
Description
General purpose analog to digital converter interface.
General purpose analog to digital converter interface.
Comment
1.8V power domain
1.8V power domain
Table 20: ADC electronic characteristics
Characteristics
Input Range
Internal pull-up resistor
Input serial resistance
Min.
0
1
Typ.
400
–
Max.
1.875
–
Unit
V
KΩ
MΩ
NOTE
“AT+CADC” can be used to read the voltage of the ADC pin, for more details, please refer to document
[1].
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SIM7090G Hardware Design V1.02
LDO output
SIM7090G has a LDO power output named VDD_EXT. The output voltage is 1.8V. This voltage can only be pulled up for the external GPIO or power supply for the level conversion circuit.
Figure 22 ： Power on sequence of the VDD_EXT
Table 21: Electronic characteristic
Symbol
V
VDD_EXT
I
O
Description
Output voltage
Output current
Min.
-
1.75
Typ.
-
1.8
Max.
1.85
50
Unit
V mA
NOTE
The VDD_EXT is used to the IO power in the module. The Output voltage is not supported to adjust.
USB_BOOT Interface
SIM7090G provides a USB_BOOT pin for firmware upgrade during development or factory production.
Before the module powers up, pull USB_BOOT up to high level will force the module to boot from USB port.
Table 22: Pin Definition of USB_BOOT Interfaces
Pin Name
USB_BOOT
Pin No. I/O
87 DI
Description
Force the module to enter into emergency download mode.
Comment
1.8V power domain.
Active high.
If unused, keep it open.
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SIM7090G Hardware Design V1.02
GPIO Interface
The module provides three general-purpose input and output (GPIO) interfaces.
Table 23: Pin Definition of GPIO Interfaces
Pin Name Pin No. I/O Description
GPIO1
GPIO33
GPIO57
87
33
57
IO
IO
IO
General-purpose input and output interface
General-purpose input and output interface
General-purpose input and output interface
Comment
1.8V power domain.
1.8V power domain.
1.8V power domain.
Table 24: Logic Levels of GPIO Interfaces
Parameter
V
IL
V
IH
V
OL
V
OH
Min.
-0.3
1.2
0
1.35
Max.
0.6
2.0
0.45
1.8
Unit
V
V
V
V
RF control Interface
SIM7090G provides a set of antenna GRFC dedicated signals lines. It can be used to control the antenna tuner to improve antenna performance.
The reference circuit is shown in the following figure: www.simcom.com
Figure 23 ： RF control interface reference circuit
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SIM7090G Hardware Design V1.02
Force USB Download Interface
The module can enter the USB forced download mode with pulling up the BOOT_CFG pin. The reference circuit refers to the following figure.
Figure 24 ： Reference circuit of BOOT_CFG interface www.simcom.com
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SIM7090G Hardware Design V1.02
4 RF Specifications
LTE RF Specifications
Table 25: Conducted transmission power
CAT-NB2
Frequency
LTE-FDD B1
LTE-FDD B2
LTE-FDD B3
LTE-FDD B4
LTE-FDD B5
LTE-FDD B8
LTE-FDD B12
LTE-FDD B13
LTE-FDD B18
LTE-FDD B19
LTE-FDD B20
LTE-FDD B25
LTE-FDD B26
LTE-FDD B28
LTE-FDD B66
LTE-FDD B71
LTE-FDD B85
Power
20dBm +/-2.7dB
20dBm +/-2.7dB
20dBm +/-2.7dB
20dBm +/-2.7dB
20dBm +/-2.7dB
20dBm +/-2.7dB
20dBm +/-2.7dB
20dBm +/-2.7dB
20dBm +/-2.7dB
20dBm +/-2.7dB
20dBm +/-2.7dB
20dBm +/-2.7dB
20dBm +/-2.7dB
20dBm +/-2.7dB
20dBm +/-2.7dB
20dBm +/-2.7dB
20dBm +/-2.7dB
CAT-M1
Frequency
LTE-FDD B1
LTE-FDD B2
LTE-FDD B3
LTE-FDD B4
LTE-FDD B5
LTE-FDD B8
LTE-FDD B12 www.simcom.com
Power
20dBm +/-2.7dB
20dBm +/-2.7dB
20dBm +/-2.7dB
20dBm +/-2.7dB
20dBm +/-2.7dB
20dBm +/-2.7dB
20dBm +/-2.7dB
Min.
<-40dBm
<-40dBm
<-40dBm
<-40dBm
<-40dBm
<-40dBm
<-40dBm
<-40dBm
<-40dBm
<-40dBm
<-40dBm
<-40dBm
<-40dBm
<-40dBm
<-40dBm
<-40dBm
<-40dBm
Min.
<-40dBm
<-40dBm
<-40dBm
<-40dBm
<-40dBm
<-40dBm
<-40dBm
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LTE-FDD B13
LTE-FDD B14
LTE-FDD B18
LTE-FDD B19
LTE-FDD B20
LTE-FDD B25
LTE-FDD B26
LTE-FDD B27
LTE-FDD B28
LTE-FDD B66
LTE-FDD B85
20dBm +/-2.7dB
20dBm +/-2.7dB
20dBm +/-2.7dB
20dBm +/-2.7dB
20dBm +/-2.7dB
20dBm +/-2.7dB
20dBm +/-2.7dB
20dBm +2.7/-3.2dB
20dBm +/-2.7dB
20dBm +/-2.7dB
20dBm +/-2.7dB
SIM7090G Hardware Design V1.02
<-40dBm
<-40dBm
<-40dBm
<-40dBm
<-40dBm
<-40dBm
<-40dBm
<-40dBm
<-40dBm
<-40dBm
<-40dBm
NOTE
The max power is tested result for 1RB in CAT-M1 and single-tone in CAT-NB2. MPR for CAT-M1 please refer to 6.2.3EA.5 part for 3GPP. Multi-tone test results please refer to part 6.2.3F.3 for
CAT-NB2.
Table 26: Maximum Power Reduction (MPR) for UE category NB2&M1 Power Class 5
CAT-NB2
Modulation
Tone positions for 3 Tones allocation
MPR
Tone positions for 3 Tones allocation
MPR
Tone positions for 3 Tones allocation
MPR
QPSK
0-2
≤ 0.5 dB
0-5 and 6-11
≤ 1 dB
0-11
≤ 2 dB
3-5 and 6-8
0 dB
≤ 1 dB
9-11
≤ 0.5 dB
CAT-M1
Modulation
QPSK
QPSK
16 QAM
16QAM
Channel bandwidth / Transmission bandwidth (NRB)
1.4MHz
3 MHz 5 MHz 10 MHz 15 MHz 20 MHz
>2 >2 >3 >5 -
>5
≤ 2
>2
>5
≤ 2
>2
-
>3
>5
-
>5
-
-
-
-
-
-
-
MPR
(dB)
≤ 1
≤ 2
≤ 1
≤ 2 www.simcom.com
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Table 27: Operating frequencies
Frequency
BAND Information
GPS L1 BAND
GLONASS
BD
Galileo
Receiving
Refers to Table 1
1574.4
～ 1576.44 MHz
1598 ～ 1606 MHz
1559 ～ 1563 MHz
1575.42±1.023MHz
SIM7090G Hardware Design V1.02
-
-
-
-
Transmission
Table 28: E-UTRA operating bands
E-UTRA
20
25
26
27
13
14
18
19
28
66
71
85
3
4
1
2
5
8
12
UL Freq.
1920 ~1980 MHz
1850~1910MHz
1710 ~1785 MHz
1710~1755MHz
824 ~849 MHz
880 ~915 MHz
699~716MHz
777~787MHz
788~798MHz
815 ~830 MHz
830 ~845 MHz
832~862MHz
1850~1915MHz
814 ~849 MHz
807~824MHz
703~748MHz
1710~1780MHz
663~698MHz
698~716MHzHz
Table 29: Conducted receive sensitivity
Frequency
LTE HD-FDD
Receive sensitivity(Typical)
Reference 【 Table 30 】【 Table 31 】
DL Freq.
2110 ~2170 MHz
1930~1990MHz
1805 ~1880 MHz
2110~2155MHz
869 ~894 MHz
925 ~960 MHz
729~746MHz
746~756MHz
758~768MHz
860 ~875 MHz
875 ~890 MHz
791~821MHz
1930~1995MHz
859 ~894 MHz
852~869MHz
758~803MHz
2110~2180MHz
617~652MHz
728~746MHz
Receive sensitivity(MAX)
3GPP
Duplex Mode
HD-FDD
HD-FDD
HD-FDD
HD-FDD
HD-FDD
HD-FDD
HD-FDD
HD-FDD
HD-FDD
HD-FDD
HD-FDD
HD-FDD
HD-FDD
HD-FDD
HD-FDD
HD-FDD
HD-FDD
HD-FDD
HD-FDD
Table 30: CAT-M1 Reference sensitivity (QPSK) www.simcom.com
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E-UTRA
Band
1
28
66
85
20
25
26
27
8
12
13
14
18
19
4
5
2
3
REFSENS MAX (dBm)
3GPP Request
-103
-103
-103
-100.5
-99.5
-101
-101.5
-101.5
NA
-100
-101
-100
-103
-101.5
-100.5
-100
-100
-100
SIM7090G Hardware Design V1.02
REFSENS Typical (dBm) Duplex Mode
-103
-107
-107
-107
-103
-108
-108
-107
-107
-107
-109
-107
-107
-107
-107
-107
-106
-106
HD-FDD
HD-FDD
HD-FDD
HD-FDD
HD-FDD
HD-FDD
HD-FDD
HD-FDD
HD-FDD
HD-FDD
HD-FDD
HD-FDD
HD-FDD
HD-FDD
HD-FDD
HD-FDD
HD-FDD
HD-FDD www.simcom.com
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SIM7090G Hardware Design V1.02
Table 31: CAT-NB2 Reference sensitivity (QPSK)
Operating band
66
71
85
20
25
26
28
12
13
18
19
3
4
5
8
1
2
REFSENS MAX(dBm)
3GPP Request
-108.2
-108.2
-108.2
-108.2
-108.2
-108.2
-108.2
-108.2
-108.2
-108.2
-108.2
-108.2
-108.2
-108.2
-108.2
-108.2
-108.2
REFSENS Typical
(dBm)
-116
-115
-114
-114
-115
-115
-116
-115
-113
-115
-115
-116
-116
-115
-115
-115
-115
REFSENS Typical
Repetition 12/ 7/1/128
[EPRE dbm/15KHz]
-131
-129
-128
-128
-130
-129
-130
-129
-129
-130
-130
-131
-130
-129
-130
-130
-130
NOTE
The 12/7/1/128 of the REFSENS Typical Repeated 12/ 7/1/128 [EPRE dbm/15KHz means
Subcarriers=12, MCS.TBS=7, #SF/#RU=1, #Repetition=128.
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SIM7090G Hardware Design V1.02
LTE Antenna Design Guide
Users should connect antennas to SIM7090G’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 32: 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 25: 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 SIM7090G and antenna must be controlled in
50Ω.
Two TVS are recommended in the table below.
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SIM7090G Hardware Design V1.02
Table 33: Recommended TVS
Package
0201
0402
Part Number
LXES03AAA1-154
LXES15AAA1-153
Vender
Murata
Murata
GNSS
SIM7090G merges GNSS (GPS/GLONASS/BD) 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+GLONASS)/-159 dBm (GPS+BD)
Cold-start sensitivity: -147 dBm
Accuracy (Open Sky): 1 m (CEP50)
TTFF (Open Sky) : Hot start < 1 s, Cold start< 31 s
Receiver Type: 16-channel, C/A Code
GNSS L1 Frequency: 1575.42±1.023MHz
GLONASS: 1597.5~1605.8 MHz
BD: 1559.05~1563.14 MHz
Galileo L1: 1575.42±1.023MHz
Update rate: Default 1 Hz
GNSS data format: NMEA-0183
GNSS antenna: Passive/Active antenna
NOTE
If the antenna is active type, the power should be given by main board because there is no power supply on the GNSS antenna pad. If the antenna is passive, it is suggested that the external LNA should be used.
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SIM7090G Hardware Design V1.02
4.3.2. GNSS Application Guide
Users can adopt an active antenna or a passive antenna to SIM7090G. The following figures are the reference circuits.
Figure 26: Active antenna circuit
Figure 27: Passive antenna circuit (Default)
In the above figures, components C1, L1 and L2 are used for antenna matching. Usually, the value of the component can only be obtained after the antenna is tuned, and is usually provided by the antenna supplier.
C2 is used for DC blocking. The active antenna's VDD requires an external power supply and should be considered according to the characteristics of the active antenna. It is recommended to use LDO/DCDC to turn off the active antenna when GNSS is not working to reduce current consumption.
GNSS can be tested through the NMEA port. NMEA sentences can be obtained automatically via UART or
USB. NMEA sentences include GSV, GGA, RMC, GSA and VTG. Before using GNSS, users should configure SIM7090G to the correct working mode through AT commands. For more information, please refer to the relevant documentation. SIM7090G can also obtain location information directly through AT.
NOTE www.simcom.com
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SIM7090G Hardware Design V1.02
1. GNSS is closed by default and can be started by “AT+CGNSPWR=1”. 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 document [21] for more details.
2. If the passive antenna is used, put the matching circuits close to the antenna.
3. Make sure there are no noise signals around GNSS antenna.
RF traces note
4.4.1 RF traces layout
Keep the RF trace from module ant pin to antenna as short as possible
RF trace should be 50 Ω either on the top layer or in the inner layer
RF trace should be avoided right angle and sharp angle.
Put enough GND via around RF traces.
RF trace should be far away from other high speed signal lines.
Figure 28: RF trace should be far away from other high speed signal lines www.simcom.com
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SIM7090G Hardware Design V1.02
Avoiding the paroling rout of other system antennas nearly.
There should be some distance from The GND to the inner conductor of the SMA connector. It is better to keep out all the layers from inner to the outer conductor.
Figure 29: The distance between GND to the inner conductor of SMA
GND pads around the ANT pad should not be hot pad to keep the GND complete.
4.4.2 LTE ANT and other system ANT decoupling
Make sure the efficiency of LTE main ANT more than 40%
Keep the decoupling of LTE main ANT to WLAN ANT more than 15dB
Keep the decoupling of LTE main ANT to GNSS ANT more than 30dB
NOTE
The decoupling value can be provided by ANT adventure. More details can refer to the document [22].
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SIM7090G Hardware Design V1.02
5 Electrical Specifications
Absolute maximum ratings
Absolute maximum rating for digital and analog pins of SIM7090G are listed in the following table:
Table 34: Absolute maximum ratings
Parameter
Voltage on VBAT
Voltage on USB_VBUS
Voltage at digital pins
(RESET,GPIO,I2C,UART,PCM and so on)
Voltage at PWRKEY
ADC
Min.
-0.3
-0.3
-0.3
-0.3
-0.3
-
-
-
-
-
Typ.
Max.
6.0
2.1
2.1
2.1
1.875
V
V
Unit
V
V
V
The absolute parameter is tested when VBAT has the power but the PWRKEY has no pulled down. If it is over the range, the module will be damage. If the power supply on VBAT pin had been shut down, and the other pin should not have the voltage. Otherwise, it may lead to abnormally boot up or damage the module.
Operating conditions
Table 35: Recommended operating ratings
Parameter
Voltage at VBAT
Voltage at USB_VBUS
Min.
2.7
0
Typ.
3.8
1.8
Max.
4.8
2.1
Unit
V
V
Make sure that the voltage on the VBAT pins will never drop below 2.7V, even during a transmit burst.
Otherwise, module will be power down.
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SIM7090G Hardware Design V1.02
Table 36: 1.8V Digital I/O characteristics*
Parameter Description
V
IH
High-level input voltage
V
IL
Low-level input voltage
V
OH
V
OL
High-level output voltage
Low-level output voltage
I
OH
I
OL
I
IH
I
IL
High-level output current(no pull down resistor)
Low-level output current(no pull up resistor)
Input high leakage current (no pull down resistor)
Input low leakage current(no pull up resistor)
-
-
-
Min.
1.17
-0.3
1.35
0
-1
-
-
Typ.
1.8
0
2
-
-
-2
-
-
1
-
Max.
2.1
0.63
1.8
0.45
NOTE
These parameters are for digital interface pins, such as GPIOs (including NETLIGHT and STATUS),
I2C, UART, PCM, SPI and BOOT_CFG.
mA uA uA
V
V
Unit
V
V mA
The operating temperature of SIM7090G is listed in the following table.
Table 37: Operating temperature
Parameter operation temperature
Storage temperature
Min.
-40
-45
Typ.
25
25
Max.
85
+90
Unit
℃
℃
NOTE
Module is able to make and receive voice calls, data calls, SMS and make GPRS/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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SIM7090G Hardware Design V1.02
Operating Mode
5.3.1 Operating Mode Definition
The table below summarizes the various operating modes of SIM7090G product.
Table 38: Operating mode Definition
Mode
Minimum functionality mode
Flight mode
Sleep
Idle
Cat-M1 Voice
Call
Standby
Data transmission
Power Saving Mode (PSM)
Function
In this case, the current consumption of module will be reduced to the minimal level and the module can still receive paging message and
SMS.
Software is active. Module is registered to the network, and the module is ready to communicate.
Connection between two subscribers is in progress. In this case, the power consumption depends on network settings.
Module is ready for data transmission, but no data is currently sent or received. In this case, power consumption depends on network 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” and “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 SIM 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 W_DISABLE# 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.
Setting AT command” AT+CPSMS=1” can be enable the PSM mode.
In this mode, The mode is similar to power-off. But the module remains registered on the network and there is no need to re-attach or re-establish the network connections. And all of the functions will be unavailable except the RTC function. PWRKEY and timer expires can wake up the module.
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Extended Mode DRX
(e-DRX)
SIM7090G Hardware Design V1.02
In idle or sleep mode, module and the network may negotiate over non-access stratum signaling the use of extended mode DRX for reducing power consumption.
5.3.2 Flight Mode
When the module enters into flight mode, the RF function does not work, and all AT commands correlative with RF function will be inaccessible. This mode can be set via the following ways.
Hardware: W_DISABLE#* is pulled up by default. Driving it to low level will let the module enter into flight mode.
Software: AT+CFUN=4 can be used to set the module to flight mode without removing the power supply.
5.3.3 Sleep mode
Module can enter into sleep mode for reducing its power consumption in idle module. In sleep mode, the current consumption of module will be reduced to very small level, and module can still receive paging message and SMS.
Several hardware and software conditions must be satisfied together in order to let SIM7090G enter sleep mode:
USB condition: Connected USB can’t enter into sleep mode. So if module wants to enter into sleep mode, it must disconnect the power supply for USB_VBUS first.
Software condition: If module wants to enter into sleep mode, AT comment “AT+CSCLK=1” must be set to close some clock in the module. If the value “AT+CSCLK” is “0”, module will never enter into sleep mode.
UART condition: Drive DTR to high level.
If it meets all the conditions at the same time, module will enter into sleep mode. In sleep mode, the UART is unavailable. If the host need to communicate with module, it need to pull down DTR can wake up module.
5.3.4 Minimum functionality mode
There are three functionality modes, which could be set by AT command “AT+CFUN=<fun>“. The command provides the choice of the functionality levels <fun>=0, 1, 4.
AT+CFUN=0: Minimum functionality
AT+CFUN=1: Full functionality (Default)
AT+CFUN=4: Flight mode www.simcom.com
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SIM7090G Hardware Design V1.02
If SIM7090G has been set to minimum functionality mode, the RF function and SIM card function will be closed. In this case, the serial port and USB are still accessible, but RF function and SIM card will be unavailable.
If SIM7090G 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 SIM7090G is in minimum functionality or flight mode, it can return to full functionality by the AT command “AT+CFUN=1”.
5.3.5 Power Saving Mode (PSM)
SIM7090G module can enter into PSM for reducing its power consumption. The mode is similar to power-off, but the module remains registered on the network and there is no need to re-attach or re-establish the network connections. So in PSM all the functions will be unavailable except the RTC function, module cannot immediately respond users’ requests.
When the module wants to use the PSM, it can be enabled via “AT+CPSMS=1” command. The command takes effect after module reboot. If the network supports PSM and accepts that the module uses PSM, the network confirms usage of PSM by allocating an Active Time value to the module. Module will be into PSM according to the command from network.
Either of the following methods will wake up the module from PSM:
Pulling PWRKEY pin to low level will wake up the module.
When the timer expires, the module will be automatically woken up.
5.3.6 Extended Mode DRX (e-DRX)
In idle or sleep mode, module and the network may negotiate over non-access stratum signaling the use of extended mode DRX for reducing power consumption.
E-DRX diagrammatic sketch refer to the following figure.
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ptw
DRX
Cycle length ptw
DRX
Cycle length
SIM7090G Hardware Design V1.02
ptw
···
DRX
Cycle length
Figure 30: e-DRX diagrammatic sketch
When module and the network negotiate stratum signaling in idle mode or sleep mode, extended mode
DRX can decrease the times of paging time window (PTW) and increase the cycle length. For this reason it had reduced the times of DRX, and had reduced the frequency of DRX between module and the network.
So that can reduce power consumption for module.
If e-DRX is supported by the network, then it can be enabled by “AT+CEDRXS” command.
NOTE
For details about “AT+CEDRXS”, please refer to Document [1]
Current Consumption
The current consumption is listed in the table below.
Table 39: Current consumption on VBAT Pins (VBAT=3.8V)
GNSS
GNSS supply current
(AT+CFUN=0,without USB connection)
Sleep/idle mode
LTE supply current
(GNSS off ， without USB connection)
Power Saving Mode
Tracking(non-DPO), typical: 54mA
Tracking(DPO mode), typical: 17.5mA
Sleep mode Typical: 0.78mA @DRX2.56S
Idle mode Typical: 14mA www.simcom.com
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PSM supply current e-DRX e-DRX mode supply current :
( AT+CSCLK=1 ；
AT+CNETLIGHT=0 ；
AT+CEDRX=2,1,X, )
Data Transmission
LTE-FDD B1
LTE-FDD B2
LTE-FDD B3
LTE-FDD B4
LTE-FDD B5
LTE-FDD B8
LTE-FDD B12
LTE Cat-M1
(Band Width: 10MHz)
LTE-FDD B13
LTE-FDD B14
LTE-FDD B18
LTE-FDD B19
LTE-FDD B20
LTE-FDD B25
LTE-FDD B26
LTE-FDD B27
LTE-FDD B28
SIM7090G Hardware Design V1.02
PSM mode Typical: 3uA
@PTW=40.96s
；
eDRX=81.92s
；
DRX=2.56s
Typical ： 0.65mA
@PTW=25.6s
；
eDRX=163.84s
；
DRX=2.56s,
Typical ： 0.46 mA
@21dbm Typical: 114mA
@10dbm Typical: 101mA
@0dbm Typical: 91mA
@21dbm Typical: 111mA
@10dbm Typical: 102mA
@0dbm Typical: 91mA
@21dbm Typical: 109mA
@10dbm Typical: 101mA
@0dbm Typical: 90mA
@21dbm Typical: 110mA
@10dbm Typica : 100mA
@0dbm Typical: 90mA
@21dbm Typical: 112mA
@10dbm Typical: 99mA
@0dbm Typical: 91mA
@21dbm Typical: 113mA
@10dbm Typical: 99mA
@0dbm Typical: 91mA
@21dbm Typical: 110mA
@10dbm Typical: 99mA
@0dbm Typical: 91mA
@21dbm Typical: 112mA
@10dbm Typical: 99mA
@0dbm Typical: 93mA
@21dbm Typical: 112mA
@10dbm Typical: 99mA
@0dbm Typical: 91mA
@21dbm Typical: 112mA
@10dbm Typical: 99mA
@0dbm Typical: 91mA
@21dbm Typical: 111mA
@10dbm Typical: 99mA
@0dbm Typical: 91mA
@21dbm Typical: 113mA
@10dbm Typical: 99mA
@0dbm Typical: 91mA
@21dbm Typical: 111mA
@10dbm Typical: 102mA
@0dbm Typical: 91mA
@21dbm Typical: 112mA
@10dbm Typical: 100mA
@0dbm Typical: 91mA
@21dbm Typical: 110mA
@10dbm Typical: 99mA
@0dbm Typical: 91mA
@21dbm Typical: 112mA
@10dbm Typical: 99mA
@0dbm Typical: 91mA www.simcom.com
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LTE-FDD B66
LTE-FDD B85
LTE-FDD B1
LTE-FDD B2
LTE-FDD B3
LTE-FDD B4
LTE-FDD B5
LTE-FDD B8
LTE-FDD B12
LTE Cat-NB1/NB2
(Band Width:
15KHz single tone)
LTE-FDD B13
LTE-FDD B18
LTE-FDD B19
LTE-FDD B20
LTE-FDD B25
LTE-FDD B26
LTE-FDD B28
LTE-FDD B66
LTE-FDD B71
LTE-FDD B85 www.simcom.com
SIM7090G Hardware Design V1.02
@21dbm Typical: 162mA
@10dbm Typical: 130mA
@0dbm Typical: 102mA
@21dbm Typical: 174mA
@5dbm Typical: 106mA
@0dbm Typical: 100mA
@21dbm Typical: 130mA
@10dbm Typical: 86mA
@0dbm Typical: 54mA
@21dbm Typical: 124mA
@10dbm Typical: 84mA
@0dbm Typical: 53mA
@21dbm Typical: 115mA
@10dbm Typical: 83mA
@0dbm Typical: 53mA
@21dbm Typical: 114mA
@10dbm Typical: 83mA
@0dbm Typical: 53mA
@21dbm Typical: 125mA
@10dbm Typical: 74mA
@0dbm Typical: 53mA
@21dbm Typical: 126mA
@10dbm Typical: 77mA
@0dbm Typical: 52mA
@21dbm Typical: 119mA
@10dbm Typical: 73mA
@0dbm Typical: 51mA
@21dbm Typical: 123mA
@10dbm Typical: 74mA
@0dbm Typical: 52mA
@21dbm Typical: 121mA
@10dbm Typical: 75mA
@0dbm Typical: 53mA
@21dbm Typical: 123mA
@10dbm Typical: 76mA
@0dbm Typical: 53mA
@21dbm Typical: 127mA
@10dbm Typical: 78mA
@0dbm Typical: 53mA
@21dbm Typical: 124mA
@10dbm Typical: 73mA
@0dbm Typical: 53mA
@21dbm Typical: 121mA
@10dbm Typical: 76mA
@0dbm Typical: 53mA
@21dbm Typical: 122mA
@10dbm Typical: 75mA
@0dbm Typical: 52mA
@21dbm Typical: 115mA
@10dbm Typical: 83mA
@0dbm Typical: 53mA
@21dbm Typical: 118mA
@10dbm Typical: 73mA
@0dbm Typical: 50mA
@21dbm Typical: 120mA
@5dbm Typical: 55mA
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SIM7090G Hardware Design V1.02
@0dbm Typical: 51mA
ESD Notes
SIM7090G is sensitive to ESD in the process of storage, transporting, and assembling. When SIM7090G is mounted on the users’ mother board, the ESD components should be placed beside the connectors which human body may touch, such as SIM card holder, audio jacks, switches, keys, etc. The following table shows SIM7090G ESD measurement performance without any external ESD component.
Table 40: The ESD performance measurement (Temperature: 25 ℃ , Humidity: 45%)
Part
VBAT,GND
Antenna port
Other PADs
Contact discharge
+/-6K
+/-5K
+/-1K
Air discharge
+/-12K
+/-10K
+/-3K www.simcom.com
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6 SMT Production Guide
Top and Bottom View of SIM7090G
SIM7090G Hardware Design V1.02
Figure 31: Top and bottom view of SIM7090G www.simcom.com
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Label Information
SIM7090G Hardware Design V1.02
Figure 32: Label information
Table 41: The description of label information
No.
C
D
G
A
B
Description
LOGO
No.1 Pin
Project name
Product code
QR code www.simcom.com
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SIM7090G Hardware Design V1.02
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 33: The ramp-soak-spike reflow profile of SIM7090G
NOTE
For more details about secondary SMT, please refer to the document [19].
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SIM7090G Hardware Design V1.02
Moisture Sensitivity Level (MSL)
SIM7090G is qualified to Moisture Sensitivity Level (MSL) 3 in accordance with JEDEC J-STD-033.
The following table shows the features of Moisture Sensitivity Level (MSL). After seal off, storage conditions must meet the following table. If the storage time was expired, module must be baking before SMT.
Table 42: Moisture Sensitivity Level and Floor Life
Moisture Sensitivity
Level (MSL)
1
4
5
5a
2
2a
3
6
Floor Life (out of bag) at factory ambient≤30°C/60% RH or as stated
Unlimited at ≦ 30 ℃ /85% RH
1 year at ≦ 30 ℃ /60% RH
4 weeks at ≦ 30 ℃ /60% RH
168 hours at ≦ 30 ℃ /60% RH
72 hours at ≦ 30 ℃ /60% RH
48 hours at ≦ 30 ℃ /60% RH
24 hours at ≦ 30 ℃ /60% RH
Mandatory bake before use. After bake, it must be reflowed within the time limit specified on the label.
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SIM7090G Hardware Design V1.02
Baking
In order to get better yield, the module need to bake before SMT.
If the packaging is in perfect condition, the module which date of production is within six months has no use for baking. If the date of production is more than six months, the module must be baking.
If the packaging had been opened or damaged, the module must be baking.
Table 43: Baking conditions conditions
Baking temperature
Baking time parameters
120 ℃
8 hours
NOTE
IPC / JEDEC J-STD-033 standard must be followed for production and storage.
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Stencil Foil Design Recommendation
The recommended thickness of stencil foil is 0.13mm.
SIM7090G Hardware Design V1.02
www.simcom.com
Figure 34: stencil recommendation (Unit: mm)
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7 Packaging
Tray packaging
SIM7090G module support tray packaging.
SIM7090G Hardware Design V1.02
Module tray drawing ：
Figure 35: packaging diagram www.simcom.com
Figure 36: Tray drawing
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Table 44: Tray size
Length （ ±3mm ）
242.0
Small carton drawing ：
Width （ ±3mm ）
161.0
SIM7090G Hardware Design V1.02
Module number
50
Figure 37: Small carton drawing
Table 45: Small Carton size
Length （ ±10mm ） Width （ ±10mm ） Height （ ±10mm ）
270 180 120
Module number
50*20=1000 www.simcom.com
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Big carton drawing ：
SIM7090G Hardware Design V1.02
Figure 38: Big carton drawing
Table 46: Big Carton size
Length （ ±10mm ） Width （ ±10mm ）
380 280
Height （ ±10mm ）
280
Module number
1000*4=4000 www.simcom.com
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SIM800C-DS Hardware Design V1.02
8 Appendix
Coding Schemes and Maximum Net Data Rates over Air Interface
Table 47: Coding Schemes and Maximum Net Data Rates over Air Interface
LTE-FDD device category
(Downlink)
Category M1
Max data rate
300 kbps
（ peak ）
20 kbps Category NB2
LTE-FDD device category
(Uplink)
Category M1
Category NB2
Max data rate
300 kbps
10.3 kbps
（ peak ）
Modulation type
QPSK/16QAM
BPSK/QPSK
Modulation type
QPSK/16QAM
BPSK/QPSK www.simcom.com
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SIM800C-DS Hardware Design V1.02
Related Documents
Table 48: Related Documents
NO. Title
[1]
SIM7080_Series_ AT
Command Manual V1.xx
[2] 3GPP TS 51.010-1
[3]
[4]
[5]
[6]
[7]
[8]
3GPP TS 34.124
3GPP TS 34.121
[9] IEC/EN60950-1(2001)
[10] 3GPP TS 51.010-1
[12]
[13]
[14]
[15]
3GPP TS 34.123-1
3GPP TS 34.123-3
EN 301 908-02 V2.2.1
EN 301 489-24 V1.2.1
[11] 2002/95/EC
Module secondary-SMT-UGD
V1.xx
SIM7090G UART Application
Note_V1.xx
ETSI EN 301 908-13
(ETSI TS 136521-1 R13.4.0)
ANTENNA DESIGN
GUIDELINES FOR
MULTI-ANTENNA SYSTEM V1
01
Description
AT Command Manual
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
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
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.
IMT cellular networks; Harmonized EN covering the essential requirements of article 3.2 of the R&TTE Directive;
Part 13
Design notice for multi-antenna.
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SIM800C-DS Hardware Design V1.02
Terms and Abbreviations
Table 49: Terms and Abbreviations
Abbreviation Description
ADC Analog-to-Digital Converter
FCC
FD
FDMA
FR
GMSK
GNSS
GPRS
GPS
GSM
DRX e-DRX
EFR
EGSM
EMC
ESD
ETS
EVDO
DAC
DRX
DSP
DTE
DTR
DTX
DAM
DPO
ARP
BER
BD
BTS
CS
CSD
CTS
Antenna Reference Point
Bit Error Rate
BeiDou
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
Downloadable Application Module
Dynamic Power Optimization
Discontinuous Reception
Extended Discontinuous Reception
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 www.simcom.com
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SMS
SMPS
TDMA
TE
TX
UART
VSWR
SM
PAP
PBCCH
PCB
PCS
RF
RMS
RTC
SIM
HR
HSPA
I2C
IMEI
LTE
MO
MS
MT
NMEA
MC
ON
RC
SM
UMTS
UART
PSM
LD
NC
EDGE
HSDPA
HSUPA
ZIF
WCDMA
VCTCXO
SIM www.simcom.com
SIM800C-DS Hardware Design V1.02
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
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
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
Universal asynchronous receiver transmitter
Power saving mode
SIM last dialing phonebook (list of numbers most recently dialed)
Mobile Equipment list of unanswered MT calls (missed calls)
SIM (or ME) own numbers (MSISDNs) list
Mobile Equipment list of received calls
SIM phonebook
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NC Not connect
SIM800C-DS Hardware Design V1.02
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SIM800C-DS Hardware Design V1.02
Safety Caution
Table 50: 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.
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