M10 Hardware Design
3.11 SIM card interface
3.11.1 SIM card application
You can use AT Command to get information in SIM card. For more information, please refer to
document [1].
The SIM interface supports the functionality of the GSM Phase 1 specification and also supports
the functionality of the new GSM Phase 2+ specification for FAST 64 kbps SIM (intended for use
with a SIM application Tool-kit).
Both 1.8V and 3.0V SIM Cards are supported.
The SIM interface is powered from an internal regulator in the module having normal voltage 3V.
All pins reset as outputs driving low. Logic levels are as described in table
Table 16: Pin definition of the SIM interface
Name Pin Function
SIM_VDD 12 SIM Card Power output automatic output on SIM
mode，one is 3.0V±10%, another is 1.8V±10%.
Current is about 10mA.
SIM_DATA 13 SIM Card data I/O
SIM_CLK 14 SIM Card Clock
SIM_RST 15 SIM Card Reset
SIM_PRESENCE 11 SIM Card Presence
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 22Ω resistors showed in the following figure should be added in series on the IO line
between the module and the SIM card for protecting the SIM I/O port. Note that the SIM
peripheral circuit should be closed to the SIM card socket.
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.
M10_HD_V1.00 - 45 -
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