User Guide

PAMS
Technical Documentation
NSE–8/9
System Module
Page 2– 39
Issue 1 07/99
3.2 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 are powered
off
– all resets active
There is a delay of 100 us between the expiring of the watchdog and
reaching the power off state. During this time CCONT does not accept
charger detection nor power on interrupts, i.e. if user generates these
interrupts during the 100 us delay they don’t have any effect and the
phone stays off.
Watchdog Initiated Power Down Procedure
Watchdog initiated power down is typically a result of a phone malfunction,
like SW errors, when the CCONT watchdog is not reset by SW. Because
of this the watchdog initiated power down can be entered in any
operational state. Watchdog can be disabled by HW means by connecting
the CCONT WDDisX pin to ground.
0. INITIAL CONDITIONS: ANY OPERATIONAL STATE
– watchdog enabled
1. CCONT WATCHDOG EXPIRES
2. POWER DOWN THE SYSTEM
2.1 CCONT activates power up reset (PURX) signal which
disables all regulators (system control switches to CCONT at
PURX activation)
2.2 CCONT powers itself off
3. POWER OFF STATE
– all components except CCONT RTC and DC/DC converter are powered
off
– all resets active
There is a delay of 100 us between the expiring of the watchdog and
reaching the power off state. During this time CCONT does not accept
charger detection nor power on interrupts, i.e. if user generates these
interrupts during the 100 us delay they don’t have any effect and the
phone stays off.
Battery Voltage Drop Initiated Power Down Procedure
When battery voltage approaches the cutoff voltage the phone will notify
the user of the situation. If the user does not charge the battery the battery
voltage will eventually drop below the operation cutoff voltage and the