Lcd Display Interface; Adc - SimCom SIM900D Hardware Design

SIM900D Hardware Design

3.12 LCD Display Interface

SIM900D provides a serial LCD display interface that supports serial communication with LCD device. When
used as LCD interface, the following table is the pin definition. LCD interface timing should be united with the
LCD device.
Table19: Pin Definition of the LCD interface
Pin Name
DISP_CLK
DISP_DATA
DISP_D/C
DISP_CS
*Note: This function is not supported in the default firmware. There must be some customized firmware if user
wants. Please contact SIMCom for more details.
The DISP_RST can select the KBR0 or GPO0, when KBR0 or GPO0 is not used for another function.

3.13 ADC

SIM900D provides one auxiliary ADC0 (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+CADC" to read the voltage value on ADC. For details of this AT command, please refer to
related document [1].
Table20: ADC specification
Voltage range
ADC Resolution
Sampling rate
SIM900D_Hardware Design_V1.04
Pin Number Function
13 Display clock for LCD
14 Display data output
16 Display data or command select
46 Display enable
MIN Type
0 -
- 10
- -
MAX
2.8
-
200K
48
Units
V
bits
Hz
2010.10.09