FS5600 datasheet(40/111 Pages) NXP

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NXP Semiconductors

FS5600

Automotive buck regulator and controller with voltage monitors and watchdog timer

For a watchdog refresh to be considered valid (good), the refresh must occur with the

right answer during the right time (OPEN window). This is represented on the figure

below.

aaa-037158

Bad data

Good data

None

WD_failure

No issue

WD_failure

Closed

Opened

WD_Window

Closed window

Opened window

WD window period

with DC configurable

WD_OK

WD_failure

Watchdog

Answer

(from MCU)

Figure 12. Windowed watchdog concept

After a good or a bad watchdog refresh, a new window period starts immediately.

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

Table 38. Watchdog window period configuration

FS5600

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Product data sheet

Rev. 3 — 2 August 2022

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