MPF7100BVBA2ES datasheet(89/125 Pages) NXP

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NXP Semiconductors

PF7100

7-channel power management integrated circuit for high performance applications

PF7100

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Product data sheet

Rev. 4 — 9 March 2021

89 / 125

A watchdog event initiated by the WDI pin may perform a hard WD reset or a soft WD

reset as defined by the WDI_MODE bit. A watchdog event initiated by the internal

watchdog always performs a hard WD reset.

15.10.1 Internal watchdog timer

The internal WD timer counts up and expires when it reaches the value in the

WD_DURATION[3:0] register. When the WD timer starts counting, the WD_CLEAR

flag is set to 1. Clearing the WD_CLEAR flag within the valid window is interpreted as a

successful watchdog refresh and the WD timer gets reset. The MCU must write a 1 to

clear the WD_CLEAR flag.

The WD timer is reset when device goes into any of the OFF modes and does not start

counting until RESETBMCU is deasserted in the next power up sequence.

The OTP_WD_DURATION[3:0] selects the initial configuration for the watchdog window

duration between 1.0 ms and 32768 ms (typical values).

The watchdog window duration can change during the system-on states by modifying the

WD_DURATION[3:0] bits on the functional register map. If the WD_DURATION[3:0] bits

get changed during the system-on states, the WD timer is reset.

Table 73. Watchdog duration register

WD_DURATION[3:0]

Watchdog timer duration (ms)

0000

0001

0010

0011

0100

0101

0110

0111

128

1000

256

1001

512

1010

1024

1011

2048

1100

4096

1101

8192

1110

16384

1111

32768

The WD_EXPIRE_CNT[2:0] counter is used to ensure that no cyclic watchdog

condition occurs. When the WD_CLEAR flag is cleared successfully before the

WD timer expires, the WD_EXPIRE_CNT[2:0] is decreased by 1. Every time the

WD timer is not successfully refreshed, it gets reset and starts a new count and the

WD_EXPIRE_CNT[2:0] is increased by 2.

If WD_EXPIRE_CNT[2:0] = WD_MAX_EXPIRE[2:0], a WD event is initiated. The default

maximum amount of time the watchdog can expire before starting a WD reset is set

by the OTP_WD_MAX_EXPIRE[2:0]. Writing a value less than or equal to 0x02 on the

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