pcf50603 NXP Semiconductors, pcf50603 Datasheet - Page 12

• Manufacturer Part Number: pcf50603
• Description: Controller For Power Supply And Battery Management
• Manufacturer: NXP Semiconductors

Philips Semiconductors
8.1.3
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
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 (t
especially convenient to avoid accidental switch-off of the
2003 Oct 31
handbook, full pagewidth
Controller for power supply
and battery management
(internal status bit)
BATRMSTAT
W
A
RSTHC_N
UTOMATIC RESTART AFTER BATTERY REMOVAL
ATCHDOG TIMER
CLK32K
V SAVE
xxVDD
system
V BAT
state
V LOW_BACK
V LOW_BAT
V VERY_LOW_BAT
ACTIVE
BATRMLIM
Fig.6 Automatic restart after battery removal.
). This feature is
<t BATRMLIM
SAVE
12
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
(V
battery, high temperature, programming GO_STDBY do
not trigger this function.
This feature is only applicable upon the condition that a
BBC (V
BAT
< 2.7 V). All other shut-down conditions like, low
SAVE
t reset
> V
VERY_LOW_BACK
ACTIVE
) is available in the system.
Preliminary specification
PCF50603
MCE539