I2C Bus - SimCom SIM808 Hardware Design

Table 23: Pin definition of the keypad interface
Name Pin
COL0 62
COL1 61
COL2 60
COL3 59
ROW0 58
ROW1 57
ROW2 56
ROW3 55
Table 24: Keypad multiplex function
Pin name Pin number
COL0 62
COL1 61
COL2 60
COL3 59
ROW0 58
ROW1 57
ROW2 56
ROW3 55
Note: Multiplex Function need different software version .

4.13 I2C BUS

The SIM808 provides an I2C interface, it can be driven by either the master or slave and conform to the I2C
specification. It has the following features:
Compliant master mode operation
SIM808_Hardware Design_V1.00
Figure 46: Keypad detected
Function
Keypad matrix column
Keypad matrix row
Mode 0(default)
COL0
COL1
COL2
COL3
ROW0
ROW1
ROW2
ROW3
47
Smart Machine Smart Decision
Default state
Pull up
Pull down
Pull down
Pull down
Pull down
Pull down
Pull down
Pull down
Mode 1
GPIO18
GPIO17
GPIO16
GPIO15
GPIO14
GPIO13
GPIO12
GPIO11
2014.03.27