SimCom SIM800 User Manual

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SIM800_Hardware Design_V1.10 44 2018-08-13
4.12. I2C BUS
The SIM800 provides an I2C interface. It has the following features:
 Compliant master mode operation
 Adjustable clock speed for LS/FS mode operation
 Support 7-bit/10-bit addressing
 Support high speed mode
 Support slave clock extension
 START/STOP/REPEATED condition
 Manual transfer mode
 Multi-write per transfer (up to 8 data bytes for non-DMA mode)
 Multi-read per transfer (up to 8 data bytes for non-DMA mode)
 Multi-transfer per transaction
 Combined format transfer with length change capability
 Active drive/write-and I/O configuration
Table 21: Pin definition of the I2C
Note: I2C has been pulled up to 2.8V via 4.7KΩ inside.
4.13. General Purpose Input/Output (GPIO)
SIM800 provides 2 GPIO pins. The output voltage level of the GPIO can be set by the AT command “AT+
SGPIO”
or “AT+CGPIO”. The input voltage level of the GPIO can also be read by the AT command “AT+
SGPIO”or
“AT+CGPIO”. For more details, please refer to document [1].
NOTE: If you use AT+SGPIO,, <GPIO> According to the following mapping
GPIO17
：
<GPIO>=3
GPIO19
：
<GPIO>=2
The Pin number table in the AT+CGPIO command under <pin> reference
Table 22: Pin definition of the GPIO
Pin name Pin number
Reset state
GPIO17
11
-
GPIO19
13
-
Pin name
Pin number
Description
SCL 37 I2C serial bus clock(open drain output)
SDA 38 I2C serial bus data(open drain output)

SimCom SIM800 Specifications

General

Brand	SimCom
Model	SIM800
Category	Control Unit
Language	English