MFS5600AMBAFES datasheet(42/118 Pages) NXP

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NXP Semiconductors

FS5600

Automotive buck regulator and controller with voltage monitors and watchdog timer

17 Functional safety features in FS5600

The FS5600 is offered in QM, ASIL B, and Enhanced ASIL B variations. This section describes the features

of the ASIL B and Enhanced ASIL B variations. The content in this document prior to this section applies to all

device variations.

The FS5600 offers comprehensive monitoring and self-test capabilities to achieve high diagnostic coverage at

the system level. The functional safety features of FS5600 include:

• Four high precision voltage monitors (in addition to monitoring of SW1 and SW2 internally)

• Challenger windowed watchdog timer

• FCCU monitoring

• 2x ERRMON monitoring for external signal monitoring

• Fail-safe Output (FS0B) with programmable fault reaction

• PGOOD1 and PGOOD2 outputs with programmable fault reaction

• Stuck-at-fault detection on PGOOD1, PGOOD2, and FS0B outputs

• State machine with programmable fault reactions

• Redundant band gap with band gap comparator for self-test

• Internal oscillator self-test

• Built-in self-test (ABIST and LBIST) of analog and digital monitoring functions for latent failure diagnostics

• On-Demand ABIST

• CRC on OTP bits in the device

• I2C with CRC

• NOT register functionality to prevent accidental writes to critical registers

• Monitoring of internal voltages such as VCC and VDIG for over and under voltage faults

17.1 GPIO1/2/3 feature selection

The GPIO1/2/3 are multipurpose pins. Specific feature selection on these pins should be selected via OTP

using the OTP_GPIO1_CFG[1:0], OTP_GPIO2_CFG[1:0] and OTP_GPIO3_CFG[1:0] bits as shown below in

Table 34, Table 35, and Table 36.

OTP_GPIO1_CFG[1:0]

GPIO1 configuration

Output is high Z

GPO (output)

ERRMON1 (input)

Reserved (do not use)

Table 34. GPIO1 function selection

OTP_GPIO2_CFG[1:0]

GPIO2 configuration

GPO (output)

FCCU1 (input)

SYNCOUT (output)

VMON3

Table 35. GPIO2 function selection

FS5600

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

Product data sheet

Rev. 4 — 29 April 2024

42 / 118

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