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H330S Hardware User Manual
Page 37 of 44
5.6.4.1 Hardware Connection
SIM card hot-plugging function needs to work with USIM_CD signal.
USIM_CD will be at high level without SIM card; after inserting SIM card, USIM_CD will be at low level.
In fig. 5-8, USIM_CD signal line is connected to U2’s Pin8 (SW2), and Pin7 (SW1) is connected to the
ground. When the SIM card is not inserted, SW2 will be at high level. When the SIM card is inserted, SW2
will be connected to SW1 and thus USIM_CD level will be pulled down.
5.6.4.2 Software Settings
“+MSMPD” configures AT command for the SIM card status-detection function.
If set AT+MSMPD=0, SIM card status-detection function will be closed, and the module will not detect
USIM_CD signal.
If set AT+MSMPD=1, SIM card status-detection function will be in operation, and the module will detect if
the SIM card is inserted by USIM_CD Pin.
If USIM_CD is at low level, which indicates SIM card is inserted, the module will automatically register it to
the network.
If USIM_CD is at high level or unconnected, which indicates SIM card is not inserted, the module will not
register it to the network.
Note:
The default of +MSMPD parameter is “0”.
5.7 Analog Audio Interface
5.7.1 Definition of Audio Interface Signals
H330S wireless modules provide two channels of audio signal input and two channels of audio signal
output.
Audio signal definition:
Pin#
Pin Name
I/O
Description
13
AUXO+
O
Audio channel 2 output
14
AUXO-
O
Audio channel 2 output signal -
15
EAR-
O
Audio channel 1 earphone signal output -
16
EAR+
O
Audio channel 1 earphone signal
17
MIC+
I
Audio channel 1 MIC input
18
MIC-
I
Audio channel 1 MIC input signal -
