MFS5600AMBAFES datasheet(46/118 Pages) NXP

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NXP Semiconductors

FS5600

Automotive buck regulator and controller with voltage monitors and watchdog timer

When an error occurs on the Watchdog refresh with an error on the timing, the bit "BAD_WD_TIMING" is set for

diagnostics.

When an error occurs on the Watchdog refresh with an error on the data, the bit "BAD_WD_DATA" is set for

diagnostics.

The duration of the watchdog window is configurable from 1 ms to 1024 ms with the WD_WINDOW [3:0] bits.

The new watchdog window is effective after the next watchdog refresh. The watchdog window may be set to

infinite.

The WD_WINDOW[3:0] has a complimentary register NOT_WD_WINDOW[3:0] which must be written with

the complimentary value for the input to take effect. This is to prevent erroneous communication from causing

negative system impact.

The initial watchdog window is set to 1024 ms until the first refresh by default. This is to allow time for the MCU

to boot up and refresh the watchdog for the first time. The 1024 ms initial window is available every time the

Watchdog starts.

WD_WINDOW[3:0]

Watchdog window period

0000

DISABLE (during INIT_FS only)

0001

1.0 ms

0010

2.0 ms

0011 (default)

3.0 ms

0100

4.0 ms

0101

6.0 ms

0110

8.0 ms

0111

12 ms

1000

16 ms

1001

24 ms

1010

32 ms

1011

64 ms

1100

128 ms

1101

256 ms

1110

512 ms

1111

1024 ms

Table 38. Watchdog window period configuration

The duty cycle of the watchdog window is configurable from 31.25 % to 68.75 % with the WDW_DC [2:0] bits.

The new duty cycle is effective after the next watchdog refresh.

WDW_DC [2:0]

CLOSED window

OPEN window

000

31.25 %

68.75 %

001

37.5 %

62.5 %

010 (default)

50 %

011

62.5 %

37.5 %

100

68.75 %

31.25 %

Table 39. Watchdog window duty cycle configuration

FS5600

All information provided in this document is subject to legal disclaimers.

Product data sheet

Rev. 4 — 29 April 2024

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