V1.0 Page 35 of 46 ICM MP CCQ ST
C45, M50 AND MT50 Company Confidential © Copyright Siemens AG 05/02
6.4 Real Time Clock (integrated in the EGOLD+)
The real time clock is powered via its own voltage regulator inside the ASIC (D361)
directly from the battery. The so gained voltage VDD_RTC is buffered by a capacitor
(C369) to keep the data (e.g. clock) in the internal RAM during a battery change for
at least 30 seconds.
An alarm function is also integrated which allows to switch the phone on and off.
via RTC_INT
The reference oscillator for the RTC is (Z100)
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