MFS5600AMBAFES datasheet(52/118 Pages) NXP

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NXP Semiconductors

FS5600

Automotive buck regulator and controller with voltage monitors and watchdog timer

Once in the NORMAL STATE a high or low on ERRMON1/2 (as selected by OTP), is used to assert the FS0B

pin as described below.

When OTP_ERRMON1/2_FLT_POL = 0, a low level on the ERRMON1/2 pin is detected as a fault.

When OTP_ERRMON1/2_FLT_POL = 1, a high level on the ERRMON1/2 pin is detected as a fault.

Upon detect of a fault, the ERRMONx_I bit is set in the FS5600. There is a programmable timer (set by

OTP_ERRMON1/2_ACK_TIME[1:0]) to allow the system microcontroller to acknowledge the ERRMON fault.

The acknowledge is performed by writing 0b1 to the ERRMON1/2_I bit which in-turn clears the bit.

If the ERRMON1/2_I bit is not cleared before the timer expires, the FS0B pin is asserted.

The below diagram shows an example of the ERRMON function.

aaa-037160

FS0B

INIT_RUN

NORMAL

INIT_RUN

MCU Acknowledgement

(via I2C)

FS0B asserted low due to

no acknowledgement until

timer expiry

ERRMONx

(applied externally)

Low level on ERRMONx detected as error

(OTP_ERRMONx_FLT_POL = 0)

Figure 17. Low-level ERRMONx detected as error

OTP_ERRMON1_ACK_TIME[1:0]

OTP_ERRMON2_ACK_TIME[1:0]

Acknowledge timer

1 ms

8 ms

16 ms

32 ms

Table 44. ERRMON acknowledge timer selection

17.6 PGOOD1/2 programmable reactions for ASIL B and Enhanced ASIL B versions

While PGOOD1 and PGOOD2 are limited to providing the status of SW1 and SW2 in the QM version of

FS5600, PGOOD1 and PGOOD2 reactions are fully programmable for the ASIL B and Enhanced ASIL B

versions.

PGOOD1 and PGOOD2 have identical functions and options available via OTP. They may be configured

differently using OTP to provide varied functions at the system level. For simplicity, PGOODx is used in place of

PGOOD1 and PGOOD2.

Function

Option

When OTP_SW1_OV_PGOODx = 1

an over-voltage event on SW1 causes PGOODx to be

asserted.

Table 45. PGOOD1/2 programmable reactions

FS5600

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

Product data sheet

Rev. 4 — 29 April 2024

52 / 118

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