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2. If customers design I2C please pull up to VDD_EXT.

4.11.1. I2C Multiplexing Function

Table 26: I2C multiplexing function

Pin name

Pin number

Mode 0(default)

Mode 1

SCL

GPIO25

SDA

GPIO26

Note: Multiplexing function need different software supply.

4.12. General Purpose Input/Output (GPIO)

SIM800H&SIM800L provides 3 GPIO pins. The output voltage level of the GPIO can be set by AT command

“AT+SGPIO”. The input voltage level of the GPIO can also be read by AT command “AT+SGPIO”. For more

details, please refer to document [1].

Table 27: Pin definition of the GPIO

Pin name

Pin number

Reset state

GPIO1

GPIO2

GPIO3

0.29s

PWRKEY

(INPUT)

SIM800H&SIM800L_Hardware Design_V2.02

2015-07-27

GPIO1

t<1.9s

GPIO2

0.8s

GPIO3

t<=10us

Figure 44: GPIO timing sequences

4.13. ADC

Table 28: Pin definition of the ADC

Pin name

Pin number

Description

ADC

Analog voltage input

SIM800H&SIM800L provides an auxiliary ADC, which can be used to measure the voltage. Customer can use

AT command “AT+CADC” to read the voltage value. For details of this AT command, please refer to document

[1].

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