Customer Care
V 1.0 Page 32of 52 ICM MP CCQ GRM
SL55
Company Confidential © Copyright Siemens AG
06/03
- Watchdog monitoring
As soon as the first Watchdog_µC signal with a rising edge is detected , the ASIC starts
the watchdog monitoring procedure. Standard switch off of the phone is the watchdog.
The first edge of watchdog is rising. If a falling edge is detected ass the first transient the
device will go to power down mode again and the whole phone is switched off.
Rising and falling edges must be detected alternated. With any edge of the Watchdog_µC
signal a counter will be reseted. The next – compared to the previous edge – inverted
edge must occur between end of TA0,TA1 and end of TB0,TB1. If the signal occurs
before end of TA0, TA1 or is not detected until end of TB0, TB1, the device will go to
power down mode immediately after the violation of the WD criteria occurs.
TA0, TA1 ~ 0.4 sec
TB0, TB1 ~ 3 sec
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