MFS5600AMMA7ES datasheet(49/111 Pages) NXP

49 / 111 page

NXP Semiconductors

FS5600

Automotive buck regulator and controller with voltage monitors and watchdog timer

PGOOD1_STUCK_AT_1 = 1 indicates that PGOOD1 pin is stuck at 1.

PGOOD1_STUCK_AT_0 = 1 indicates that PGOOD1 pin is stuck at 0.

PGOOD2_STUCK_AT_1 = 1 indicates that PGOOD2 pin is stuck at 1.

PGOOD2_STUCK_AT_0 = 1 indicates that PGOOD2 pin is stuck at 0.

FS0B_STUCK_AT_1 = 1 indicates that FS0B pin is stuck at 1.

FS0B_STUCK_AT_0 = 1 indicates that FS0B pin is stuck at 0.

During ABIST, the PGOOD1, PGOOD2, and FS0B are to be checked to ensure they

are at logic low. If any of them is not at logic low during ABIST, the corresponding

'STUCK_AT_1' bit is set.

When the FS56 releases PGOOD1, PGOOD2 or FS0B high, it monitors the pin to ensure

it is at logic high. If not, the corresponding 'STUCK_AT_0' bit is set set.

Note: There is no state transition due to stuck-at-faults. The FS5600 only reports stuck

at faults via the corresponding I2C bits. System software should evaluate the status of

these bits to control state transitions.

17.9 I2C robustness

17.9.1 I2C CRC verification

When this feature is enabled, a selectable CRC verification is performed on each I2C

transaction.

When OTP_I2C_CRC_EN = 0, the CRC verification mechanism is disabled.

When OTP_I2C_CRC_EN = 1, the CRC verification mechanism is enabled.

After each I2C transaction, the device calculates the corresponding CRC byte to ensure

the configuration command has not been corrupted.

When a CRC fault is detected, the FS5600 ignores the erroneous configuration

command and sets the CRC_I bit.

The CRC_I is cleared by writing a 1 to it.

The FS5600 implements a CRC-8-SAE, per the SAE J1850 specification.

Polynomial = 0x11D

Initial value = 0xFF

Figure 18 shows the 8-bit CRC polynomial per SAE J1850.

aaa-028696

MSB Data

I2C CRS Polynominal

Seed: 1 1 1 1 1 1 1 1

Figure 18. 8-bit CRC Polynomial

FS5600

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

Product data sheet

Rev. 3 — 2 August 2022

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