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Interface description – Siemens TC35 User Manual

Page 22

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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

I

Input for detection
of the SIM card;
high active

R

i

= 1 0 0 k

to GND

U

iLmax

= 0 . 4 V

@ I = 0 .1mA

U

iHmin

= 1.95V

U

iHmax

= 3 . 3 V

CCRST

25

O

Restart

R

0

= 2 2 0

CCIO

26

I/O

Date input/output

Input: R

i

1 M

Output: R

0

= 2 2 0

CCCLK

27

O

Clock

R

0

= 2 2 0

CCVCC

28

O

Supply voltage

CCVCC

min

=2.84V

CCVCC

max

=2.96V

I

max

= 5 0 m A

CCGND

29

X