MFS5600AMBA0ES datasheet(52/111 Pages) NXP

52 / 111 page

NXP Semiconductors

FS5600

Automotive buck regulator and controller with voltage monitors and watchdog timer

OTP bit

Fault counter configuration

OTP_ERRMON1_FLT_CNT_EN = 1[1]

increments FLT_ERR_CNT if a valid fault on the

ERRMON1 pin is detected.

OTP_ERRMON2_FLT_CNT_EN = 1[1]

increments FLT_ERR_CNT if a valid fault on the

ERRMON2 pin is detected.

OTP_FCCU_FLT_CNT_EN = 1

increments FLT_ERR_CNT if a valid fault on the

FCCU1/FCCU2 pin is detected

Table 50. Fault counter source assignment...continued

[1]

FLT_ERR_CNT increment due to an ERRMON1/2 fault occurs only in the NORMAL STATE. If a fault occurs in the

ERRMON1/2 in the INIT_RUN state, the FLT_ERR_CNT is not incremented.

17.12 Latent failure detection

17.12.1 Analog built-in self-test (ABIST)

Analog Built In Self-test (ABIST) may be enabled via OTP by setting the OTP_ABIST_EN

bit. ABIST is bypassed if OTP_ABIST_EN = 0. If enabled, the following actions are

performed.

• CRC check on mirror registers

• Checking that internal oscillators are within 15% tolerance

• Checking main band gap and monitoring band gap are within 12% of each other

• ABIST on SW1, SW2, VMON1, VMON2, VMON3, VMON4 voltage monitors.

• Check on PGOOD1, PGOOD2, and FS0B pins (check if PGOOD1, PGOOD2, and

FS0B pins are low during ABIST)

GPIO pins when used as inputs (FCCU/ERRMON) can be checked at the system level

using real-time status registers (GPIO1/2/3_RT).

Results from ABIST are stored in registers for evaluation by the processor.

The system microcontroller shall be responsible to evaluate the ABIST results and

determine if the FS5600 can proceed to the NORMAL STATE.

Flag name

Description

ABIST_CRC_ERR = 1

indicates that there was an error with the CRC

values in the mirror register.

ABIST_OSC_ERR = 1

indicates that the 20 MHz oscillator is not within

15 % of its nominal value.

BG_ERR = 1

indicates that the main and monitoring band

gaps are not within 12 % of each other.

ABIST_VMON1_OV_ERR = 1

indicates that the VMON1's over voltage

monitor is not operating in the expected range.

ABIST_VMON1_UV_ERR = 1

indicates that the VMON1's under voltage

monitor is not operating in the expected range.

ABIST_VMON2_OV_ERR = 1

indicates that the VMON2's over voltage

monitor is not operating in the expected range.

ABIST_VMON2_UV_ERR = 1

indicates that the VMON2's under voltage

monitor is not operating in the expected range.

Table 51. ABIST flag bits

FS5600

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

Product data sheet

Rev. 3 — 2 August 2022

52 / 111

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