User's Manual

GSM/GPRS Module Series
M26 Hardware Design
M26_Hardware_Design Confidential / Released 49 / 80
AT+QPCMVOL can configure the volume of input and output.
AT+QPCMVOL=vol_pcm_in, vol_pcm_out
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, which is 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
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.