Users Manual

GSM/GPRS Module Series
M66 Hardware Design
M66_Hardware_Design Confidential / Released 53 / 82
Table 15: QPCMVOL Command Description
3.10. SIM Card Interface
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 (intended for use with a
SIM application Tool-kit).
The SIM interface is powered by an internal regulator in the module. Both 1.8V and 3.0V SIM Cards are
supported.
Table 16: Pin Definition of the SIM Interface
The reference circuit for a 6-pin SIM card socket is illustrated as the following figure.
Parameter Scope Description
vol_pcm_in 0~32767 Set the input volume
vol_pcm_out 0~32767
Set the output volume
The voice may be distorted when this value exceeds 16384.
Pin Name Pin No. Description
SIM_VDD 14
Supply power for SIM card. Automatic detection of SIM card voltage.
3.0V±5% and 1.8V±5%. Maximum supply current is around 10mA.
SIM_CLK 13 SIM card clock.
SIM_DATA 11 SIM card data I/O.
SIM_RST 12 SIM card reset.
SIM_GND 10 SIM card ground.