Lcd Display/Spi Interface - SIM Tech SIMCom SIM900-DS Hardware Design

Table 9: Pin description (Molex SIM card holder)
Pin name Signal
C1 SIM_VDD
C2 SIM_RST
C3 SIM_CLK
C4 GND
C5 GND
C6 VPP
C7 SIM_DATA
C8 SIM_PRESENCE
4.8

LCD Display/SPI Interface

SIM900-DS provides a serial LCD display interface. It could also be used as SPI interface in the embedded AT
application. For details about embedded AT application, please refer to document [7].
Note: This function is not supported in the standard firmware. If user wants this function, the firmware must be customized.
Please contact SIMCom for more details.
SIM900-DS_Hardware Design_V1.00
Figure 28: Molex 91228 SIM card holder
Description
SIM card power supply
SIM card reset
SIM card clock
Connect to GND
Connect to GND
Not connect
SIM card data I/O
Detect SIM card presence
Smart Machine Smart Decision
31
2013-01-20