SIM802 Hardware Design
Table 20: PIN definition of the LCD interface
Note: This function is not supported in the default firmware. For more information, please
contact SIMCom.
3.13 General purpose input & output (GPIO)
SIM802 provides a limited number of General Purpose Input/Output signal Pin.
Table 21: GPIO of SIM802
Name
Pin
I/O
Description
GPIO
52
I/O
General purpose Input/Output
SIM802 supports two general purpose output signal Pins. These Pins can be configured through
AT command “AT+CGPIO” in users’ application to high voltage level or low voltage level. For
detail of this AT command, please refer to
document [1]
.
3.14 ADC
SIM802 provide one auxiliary ADC (General purpose analog to digital converter.) as voltage
input Pin, which can be used to detect the values of some external items such as voltage,
temperature etc. User can use AT command “AT+RADC” to read the voltage value added on
ADC Pin. For detail of this AT command, please refer to
document [1].
Table 22: ADC specification
Min
Type
Max
Units
Voltage range
0
2.4
V
ADC Resolution
16
bits
ADC accuracy
1
0.59
mV
Sampling rate
3
KHz
Name
Pin
Function
DISP_CS
58
Display enable
DISP_CLK
13
Display clock
DISP_DATA
14
Display data output
DISP_D/C
16
Display data or command select
DISP_RST
59
LCD reset
SIM802_HD_V2.01
12.01.2010
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