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Sim-card And Connectors; Sim-card - Siemens C45 Repair Documentation

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9 SIM-CARD and Connectors

9.1 SIM-Card

The SIM-CARD is supplied via
X520
at pin3 with
CCVCC
(2,9V) The
CCVCC
is a
ASIC (D361) switched 2,9V voltage, activated by
CCVZQ
from the
EGOLD+
(Address-Data G13)
If no SIM-CARD is connected, or if there is no response (CCIO) from the SIM-CARD,
the EGOLD+ tries 3 times to connect the SIM-CARD. After this time the EGOLD+
stops trying. That means, if the EGOLD+ is losing the connection while normal
operation of the mobile phone, the mobile must be switched off and on again.
The communication between the
EGOLD+
and the SIM-CARD is done via the
CCIO
X520
pin6 by using
CCCLK
as a clock signal.
The diodes V520/521 are used to protect signal lines versus switching peaks.
V1.0
Page 43 of 46
ICM MP CCQ ST
C45, M50 AND MT50
Company Confidential © Copyright Siemens AG
05/02

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