ACT8846 datasheet(33/63 Pages) QORVO

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ACT8846

Advanced PMU for Multi-core

Application Processors

Data Sheet Rev. 13.0, Nov. 11, 2019 | Subject to change without notice

33 of 63

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Watch-Dog Supervision

The ACT8846 features a watchdog supervisory function.

An internal watchdog timer of 4s is unmasked by setting

either WDSREN[ ] or WDPCEN [ ] bit to one. Once en-

abled, the watchdog timer is reset whenever there is I2C

activity for the PMU. In the case where the system soft-

ware stops responding and that there is no I2C transac-

tions 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.

Software-Initiated Power Cycle

ACT8846 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.

Figure 3:

ACT8846QM460 and ACT8846QM468 Power Control Sequence

100ms

Sleep/Wakeup

Sequence

Power on Sequence

nPBIN

nRSTO

PWREN

OUT4

OUT11

2ms

PWRHLD

UVLO

Main Battery

OUT13

Power off

Sequence

OUT5

2ms

93% of VOUT4

OUT3

OUT1, OUT2

93% of VOUT5

2ms

93% of VOUT3

2ms

93% of VOUT11



: Watch-Dog is not supported in ACT8846QM468 and ACT8846QM490-T.

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