MFS5600AMBAFES datasheet(80/118 Pages) NXP

80 / 118 page

NXP Semiconductors

FS5600

Automotive buck regulator and controller with voltage monitors and watchdog timer

Bit

Symbol

Description

4b'1011 — 64 ms.

4b'1100 — 128 ms.

4b'1101 — 256 ms.

4b'1110 — 512 ms.

4b'1111 — 1024 ms.

Reset Condition — POR

10 to 8

WDW_DC[2:0]

Watchdog window duty cycle.

Applied only when WDW_DC[2:0] = NOT(NOT_WDW_DC[2:0]).

3b'000 — Closed window 31.25 % Open window 68.75 %.

3b'001 — Closed window 37.5 % Open window 62.5 %.

3b'010 — Closed window 50 % Open window 50 %.

3b'011 — Closed window 62.5 % Open window 37.5 %.

3b'100 — Closed window 68.75 % Open window 31.25 %.

3b'101 — Closed window 50 % Open window 50 %.

3b'110 — Closed window 50 % Open window 50 %.

3b'111 — Closed window 50 % Open window 50 %.

Reset Condition — POR

Table 66. WATCHDOG_CTRL2 register description...continued

18.1.12 NOT_WATCHDOG_CTRL2 register

Bit

Symbol

Description

15 to 12

NOT_WD_WINDOW[3:0]

Watchdog window duration.

4b'0000 - 4b’1111 — See WD_WINDOW[3:0] in WATCHDOG_CTRL2

Reset Condition — POR

10 to 8

NOT_WDW_DC[2:0]

Watchdog window duty cycle.

3b'000 - 3b’111 — See WDW_DC[2:0] in WATCHDOG_CTRL2

Reset Condition — POR

Table 67. NOT_WATCHDOG_CTRL2 register description

18.1.13 WATCHDOG_SEED register

Bit

Symbol

Description

15 to 0

WD_SEED[15:0]

Watchdog seed.

WD_SEED[15:0] — Default value (after reset) is 16'h5AB2 for simple

or challenger watchdog.

It is impossible to write 16'hFFFF for challenger watchdog.

It is impossible to write 16'h0000 or 16'hFFFF for simple watchdog.

Reset Condition — POR

Table 68. WATCHDOG_SEED register description

18.1.14 WATCHDOG_ANSWER register

Bit

Symbol

Description

15 to 0

WD_ANSWER[15:0]

Watchdog answer.

Table 69. WATCHDOG_ANSWER register description

FS5600

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

Product data sheet

Rev. 4 — 29 April 2024

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