Table 18: Pin Definition Of Sim Interface (Board-To-Board Connector) - SimCom SIM548C HD V1.01 Hardware Design

SIM548C Hardware Design

Table 18: Pin definition of SIM interface (board-to-board connector)

Pin Signal
17 SIM_VDD
19 SIM_RST
21 SIM_DATA
23 SIM_CLK
15 SIM_PRESENCE SIM Card Detection
Following is the reference circuit about SIM interface. We recommend an Electro-Static discharge
device ST (www.st.com ) ESDA6V1W5 or ON SEMI (www.onsemi.com ) SMF05C for "ESD
ANTI".
The SIM_PRESENCE pin is used for detecting the SIM card removal. You can use the AT
command "AT+CSDT" to set the SIMCARD configuration. For detail of this AT command,
please refer to document [1]:
You can select the 8-pins SIM card holder. The reference circuit about 8 pins SIM card holder
illustrates as following figure.
Figure 25: SIM interface reference circuit with 8-pin SIM card
If you don't use the SIM card detection function, you can let the SIM_PRESENCE pin, connect to
SIM548C_HD_V1.01
Description
SIM Card Power supply, it can identify automatically the SIM
Card power mode，one is 3.0V±10%, another is 1.8V±10%.
Current is about 10mA.
SIM Card Reset
SIM Card data I/O
SIM Card Clock
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09.05.2008