MFS5600AMBAFES datasheet(45/118 Pages) NXP

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NXP Semiconductors

FS5600

Automotive buck regulator and controller with voltage monitors and watchdog timer

Parameter

Symbol

Min

Typ

Max

Unit

OTP_VMONx_OVTH[3:0]: Set point Accuracy OTP_

VMONx_OVTH[3:0] = 1101

VMONx_OVTH

108

109.5

111

OTP_VMONx_OVTH[3:0]: Set point Accuracy OTP_

VMONx_OVTH[3:0] = 1110

VMONx_OVTH

108.5

110

111.5

OTP_VMONx_OVTH[3:0]: Set point Accuracy OTP_

VMONx_OVTH[3:0] = 1111

VMONx_OVTH

109

110.5

112

UV Debounce OTP_VMONx_UV_DB[1:0] = 00

VMONx_UVDB

UV Debounce OTP_VMONx_UV_DB[1:0] = 01

VMONx_UVDB

UV Debounce OTP_VMONx_UV_DB[1:0] = 10

VMONx_UVDB

UV Debounce OTP_VMONx_UV_DB[1:0] = 11

VMONx_UVDB

OV Debounce OTP_VMONx_OV_DB[1:0] = 00

VMONx_OVDB

OV Debounce OTP_VMONx_OV_DB[1:0] = 01

VMONx_OVDB

OV Debounce OTP_VMONx_OV_DB[1:0] = 10

VMONx_OVDB

OV Debounce OTP_VMONx_OV_DB[1:0] = 11

VMONx_OVDB

100

125

150

Table 37. VMON1-4 electrical specifications...continued

17.3 Watchdog

The FS5600 offers a windowed watchdog with Simple and Challenger schemes. The Challenger scheme is

available only in the Enhanced ASIL B version. The Watchdog timer is enabled by setting OTP_WD_DIS = 0.

The Watchdog timer is disabled if OTP_WD_DIS = 1.

When OTP_WD_SELECTION = 0, the Simple scheme is selected. When OTP_WD_SELECTION = 1, the

Challenger scheme is selected.

In the windowed watchdog, the watchdog duration is split into OPEN and CLOSED windows. The first half of the

duration (window) is CLOSED and the second half of the duration (window) is OPEN. A good watchdog refresh

must occur during the OPEN window.

The following constitute a bad (erroneous) watchdog refresh:

• Wrong watchdog answer during the OPEN window

• No watchdog refresh during the OPEN window

• Good or bad watchdog answer during the CLOSED window.

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.

FS5600

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

Product data sheet

Rev. 4 — 29 April 2024

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