SimCom SIM800L User Manual

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SIM800L(MT6261)_Hardware Design_V1.01 43 2016-07-07
 The highest data rate is 400kbit/s
 Automatic start and stop bits
 Generated response and confirmation automatically
 Application hardware I2C protocol
Table 23: Pin definition of the I2C
Notes:
1. This function is not supported in the standard firmware. If customer wants this function, the firmware must be customized.
Please contact SIMCom for more details.
2. If customers design I2C please pull up to VDD_EXT.
4.12. General Purpose Input/Output (GPIO)
SIM800L provides 3 GPIO pins. The output voltage level of the GPIO can be set by AT command “AT+SG P IO”.
The input voltage level of the GPIO can also be read by AT command “AT+SG P IO”. For more details, please refer
to document [1].
Table 24: Pin definition of the GPIO
Pin name Pin number
Reset state
GPIO1
3
I/PD
GPIO2
27
I/PU
GPIO3
28
I/PU
t <3.2s
PWRKEY
(INPUT)
GPIO1
GPIO2
t<80ms
GPIO3
Figure 41: GPIO timing sequences
4.13. ADC
Table 25: Pin definition of the ADC
Pin name
Pin number
Description
SCL 74 I2C serial bus clock(open drain output)
SDA 75 I2C serial bus data(open drain output)
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SimCom SIM800L Specifications

General

Brand	SimCom
Model	SIM800L
Category	Recording Equipment
Language	English