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

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