User Guide

PAMS
Technical Documentation
NSE–8/9
System Module
Page 2– 40
Issue 1 07/99
phone powers off. The power down procedure can be entered from any
operational state.
A brutal way for power down is to remove a battery when the phone is
powered on. The phone gets warning of this by LOW_BATT detection
signal which is connected directly to MAD (CARDDETX) . When MAD
realizes that battery is being removed it has 2 – 4 ms time to power down
the SIM interface in order to protect the SIM card. MAD2PR1 forces down
the SIM reset, SIM clock, SIM data and SIM power in this order.
Charger Removal Initiated Power Down Procedure
0. INITIAL CONDITIONS: POWER ON/ACTING DEAD STATE
1. CHARGER REMOVED
1.1 MAD gets CCONT_INT interrupt
1.2 MCU reads the status of the CCONT interrupt register and
notifies charger removal
1.3 MAD sends power off command (writes short delay to WDOG)
2. CCONT WATCHDOG EXPIRES
3. POWER DOWN THE SYSTEM
3.1 CCONT activates power up reset (PURX) signal which
disables all regulators (system control switches to CCONT at
PURX activation)
3.3 CCONT powers itself off
4. POWER OFF STATE
– all components except CCONT RTC and DC/DC converter powered off
– all resets active