NETkom ES75 - Page 18

18
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Interface description
Purpose of the connectors/connections
Signal
name
PIN I/O Description of the
GSM module
connectors
Parameters
CCIN 24 I Input for detection
of the SIM card;
high active
R
i
= 100 kΩ to GND
U
iLmax
= 0.4 V
@ I = 0.1mA
U
iHmin
= 1.95 V
U
iHmax
= 3.3 V
CCRST 25 O Restart R
0
= 220 Ω
CCIO 26 I/O Date input/output Input: R
i
≥ 1 MΩ
Output: R
0
= 220 Ω
CCCLK 27 O Clock R
0
= 220 Ω
CCVCC 28 O Supply voltage CCVCC
min
= 2.84 V
CCVCC
max
= 2.96 V
I
max
= 50 mA
CCGND 29 X
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.
Interference immunity
Electrostatic discharge requirements in
accordance with ETS 300-342-1