PCF50603 データシートの表示（PDF） - Philips Electronics

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PCF50603

Controller for power supply and battery management

Philips Electronics 

Philips Semiconductors

Controller for power supply

and battery management

Preliminary specification

PCF50603

8.1.3 WATCHDOG TIMER

The OOC contains a WatchDog Timer (WDT). By default

it is not activated. It can be activated by setting

bit WDT_RST in the OOCC register to logic 1. Once this

bit has been set, the watchdog is enabled, and needs to be

cleared once every eight seconds. If the watchdog is not

reset in time, the PCF50603 automatically goes to the

STANDBY state when the watchdog timer expires. Status

bit WDTEXP is set when the watchdog timer expires. After

each ACTIVE to STANDBY transition the WDT is disabled

and needs to be activated again by software when

entering the ACTIVE state.

8.1.4 AUTOMATIC RESTART AFTER BATTERY REMOVAL

The PMU allows for an automatic restart from SAVE to

ACTIVE state when the main battery is removed for a

period less than two seconds (tBATRMLIM). This feature is

especially convenient to avoid accidental switch-off of the

phone due to mechanical bounce on the battery. The

automatic restart is enabled or disabled by control

bit BATRM_EN in the OOCC register. By default this

automatic restart feature is disabled.

Status bit BATRMSTAT in the OOCS2 register indicates

whether the PMU returned to ACTIVE state due to a restart

after battery removal. The status bit remains active until

the PMU returns to STANDBY or SAVE state.

Figure 6 shows the timing for an automatic restart due to

battery removal.

This feature is only triggered by battery removal

(VBAT < 2.7 V). All other shut-down conditions like, low

battery, high temperature, programming GO_STDBY do

not trigger this function.

This feature is only applicable upon the condition that a

BBC (VSAVE > VVERY_LOW_BACK) is available in the system.

handbook, full pageswyisdttehm

state

ACTIVE

VLOW_BAT

VBAT VVERY_LOW_BAT

VSAVE VLOW_BACK

CLK32K

RSTHC_N

xxVDD

BATRMSTAT

(internal status bit)

SAVE

<tBATRMLIM

ACTIVE

treset

MCE539

2003 Oct 31

Fig.6 Automatic restart after battery removal.

12

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