ACT8847 datasheet(30/42 Pages) ACTIVE-SEMI

30 / 42 page

ACT8847

Rev 9, 27-June-17

Innovative PowerTM

- 30 -

www.active-semi.com

ActivePMUTM is a trademark of Active-Semi.

I2CTM is a trademark of NXP.

Watch-Dog Supervision

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.

Software-Initiated Power Cycle

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.

Figure 3:

Power Control Sequence

60ms

Sleep/Wakeup

Sequence

Enable Sequence

nPBIN

nRSTO

PWREN

(VDDALIVE) OUT6

OUT 2/3/5

2ms

PWRHLD

UVLO

Main Battery

OUT13

Shutdown Sequence

2ms

4ms

8ms

OUT4

0.5ms

93% of VOUT6

93% of VOUT2

OUT7

OUT1

OUT12

OUT11

OUT10

93% of VOUT11

OUT8

0.5ms

OUT9

1ms

0.5ms

1ms

2ms

93% of VOUT11

2ms

0.5ms

1ms

93% of VOUT2

2ms

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