ACT8847 datasheet(30/38 Pages) ACTIVE-SEMI

Numer części	ACT8847

Szczegółowy opis	Advanced PMU for Multi-core Application Processors

PDF	38 Pages

Scroll/Zoom	100%

Producent	ACTIVE-SEMI [Active-Semi, Inc]

Strona internetowa	http://www.active-semi.com

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30 / 38 page

ACT8847

Rev 5, 15-Nov-12

Innovative PowerTM

- 30 -

www.active-semi.com

Active-Semi Proprietary―For Authorized Recipients and Customers

ActivePMU

TM 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

ACT8847 Arkusz danych(PDF) 30 Page - Active-Semi, Inc