ACT8846 datasheet(31/44 Pages) ACTIVE-SEMI

31 / 44 page

ACT8846

Rev 7.0 06-Dec-2017

Innovative PowerTM

31 -

www.active-semi.com

ActivePMUTM is a trademark of Active-Semi.

I2CTM is a trademark of NXP.

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 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.

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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