20
Interface description
Purpose of the connectors/connections
Use and operation
A SIM card holder from Molex with a SIM_IN
contact is used. Only when the card holder
is inserted is the switched closed.
The card can only be replaced when the
GSM engine is in the POWER DOWN state.
Signal
name
PIN I/O Description of the
GSM module
connectors
Parameters
CCIN 24 IInput for detection
of the SIM card;
high active
Ri=100kΩ to GND
UiLmax =0.4V
@I=0.1mA
UiHmin=1.95V
UiHmax =3.3V
CCRST 25 ORestart R0=220Ω
CCIO 26 I/O Date input/output Input: Ri≥1MΩ
Output: R0=220Ω
CCCLK 27 OClock R0=220Ω
CCVCC 28 OSupply voltage CCVCCmin=2.84V
CCVCCmax=2.96V
Imax =50mA
CCGND 29 X