3Interface Application. SimCom SIM7600X

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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

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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.

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SIM7600 Series Hardware Design V1.08

Table 7: Recommended TVS list

No Manufacturer Part Number

Js-ele

Prisem

Reverse Stand-Off Voltage Package

ESDBW5V0A1 5V

PESDHC2FD4V5BH 4.5V

DFN1006-2L

Way-on

Will semi

Way-on

WS05DPF-B

ESD5611N

ESD56151W05

WS4.5DPV

4.5V

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.

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Figure 8: Switching mode power supply reference circuit

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SIM7600 Series Hardware Design V1.08

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

Magnetic Interference and ripple current from depraving RF performance.

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.

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Figure 9: Reference power on/off circuit

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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

Input high level voltage on PWRKEY pin

Input low level voltage on PWRKEY pin

100

0.6

-0.3

Min. Typ. Max. Unit

100

500

16 -

ms s

2.5

0.8

1.8

0.5

V s s ms s www.simcom.com

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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

15 -

s s

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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

0 -

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.

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Figure 12: Reference reset circuit

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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

RST

RST(delay)

RST(STATUS)

RST(USB)

RST(UART)

RST(VDD_1V8)

RST(VDD_AUX)

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

Min.

Typ.

Max. Unit

100 200 500 ms

95 100 ms

80 s s s ms

2.5

1.8

2.1

0.8

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.

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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.

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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

User need to use high speed transistors such as MMBT3904.

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.

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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.

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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

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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 .

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SIM7600 Series Hardware Design V1.08

Table 12: USB_ID description

No

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

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 -

Typ.

1.8

Max.

1.95

USIM_VDD +0.3

Unit

0.35*USIM_VDD V

USIM_VDD V

0.45

V www.simcom.com

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SIM7600 Series Hardware Design V1.08

Table 14: USIM electronic characteristic 3.0V mode (

USIM_VDD

=2.95V)

Symbol

USIM_VDD

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

0.25*USIM_VDD

USIM_VDD

0.45

Unit

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.

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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.

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SIM7600 Series Hardware Design V1.08

Figure 26: Amphenol SIM card socket

Table 15: Amphenol USIM socket pin description

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)

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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

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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

–

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

–

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 ns ns ns ns ns ns

μs ns

μs ns ns ns www.simcom.com

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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

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

Typ.

2.85

Max.

Unit

2.85+0.3

0.25*2.85 V

2.85

0.45

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.

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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

STATUS

GPIO26

GPIO No in

AT command

INT

√

Power

Domain

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

GPIO3

GPIO6

GPIO26

STATUS

GPIO43

GPIO41

GPIO77

GPIO No in

AT command

INT

√

Power

Domain

Default status

B-PD

B-PU

B-PD

Default

Functio n

Multiple x

Functio n

GPIO

GPIO SD_DTE

STATUS 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

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

Typ.

442

–

Max.

–

1.7

–

Unit

Bits us

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