ACT8847
Rev 5, 15-Nov-12
Software-Initiated Power Cycle
Watch-Dog Supervision
ACT8847 supports software-initiated power cycle.
Once the SIPC[ ] bit is set, the PMU waits for 8ms
and then initiate a power cycle to restart the entire
system.
The ACT8847 features a watchdog supervisory
function. An internal watchdog timer of 4s is
unmasked by setting either WDSREN[
]
or
WDPCEN [ ] bit to one. Once enabled, the
watchdog timer is reset whenever there is I2C
activity for the PMU. In the case where the system
software stops responding and that there is no I2C
transactions for 4s, the watchdog timer expires. As
a result, the PMU either perform a soft-reset or
power cycle, depending on whether WDSREN [ ] or
WDPCEN [ ] is set.
Figure 3:
Power Control Sequence
Innovative PowerTM
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