M10 Hardware Design
M10_HD_V3.0 - 52 -
3.10. SIM card interface
3.10.1. SIM card application
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 card, which is
intended for use with a SIM application Tool-kit.
The SIM interface is powered from an internal regulator in the module. Both 1.8V and 3.0V SIM
Cards are supported.
Table 14: Pin definition of the SIM interface
Figure 33 is the reference circuit for SIM interface, and here an 8-pin SIM card holder is used.
The pin SIM_PRESENCE is used to detect whether the tray of the Molex SIM socket, which is
used for holding SIM card, is present in the card socket. When the tray is inserted in the socket,
SIM_PRESENCE is at low level. Regardless of the SIM card is in the tray or not, the change of
SIM_PRESENCE level from high to low level prompts the module to reinitialize SIM card. In
default configuration, SIM card detection function is disabled. Customer’s application can use
“AT+QSIMDET=1,0 ” to be switched on and “AT+QSIMDET=0,0 ” to switch off the SIM card
detection function. For detail of this AT command, please refer to
document [1]. When
“AT+QSIMDET=1,0” is set and the tray with SIM card is removed from SIM socket, the
following URC will be presented.
+CPIN: NOT READY
When the tray with SIM card is inserted into SIM socket again and the module finishes
re-initializing SIM card, the following URC will be presented.
Call Ready
Name Pin Function
SIM_VDD 12 Supply power for SIM Card. Automatic detection of
SIM card voltage. 3.0V±10% and 1.8V±10%.
Maximum supply current is around 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
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