FS23 datasheet(20/230 Pages) NXP

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NXP Semiconductors

FS23

Safety system basis chip (SBC) with power management, CAN FD and LIN transceivers

12 Functional description

The FS23 device has one main state machine. The main state machine manages the power management, the

Low-Power modes, and the wake-up sources. The main state machine also manages the monitoring of the

power management, the monitoring of the MCU, and the monitoring of an external IC.

In parallel, an INIT state machine is implemented to manage the INIT state of the device. This state is used for

the configuration of the device per SPI/I2C.

The safety pins RSTB, FS0B, and LIMP0 are managed independently from each other, in parallel of the main

state machine.

12.1 Simplified state machine

aaa-052135

Start-up of

internal

circuitry

Power-up

sequence

of the

regulators

LPOFF

LPON

Normal

mode

VBOS > VBOS_UV

Regulators started

Fail-safe

VBOS_UV, VxOV, TSDx

detected

Fault error counter = max

VBOS > VBOS_por

VDIG > VDIG_por

VDIG < VDIG_ov

POR

Go2LPOFF

Go2LPON

Wake-up event:

CAN, LIN, LDT, WAKEx,

HVIOx, LVIOx, SPI/I2C

Wake-up event:

CAN, LIN, LDT,

WAKEx, HVIOx

VBOS_UV,

V1OV, V1UVLP

detected

V1UVLP

detected

FS timeout and no

automatic restart

FS timeout and

automatic restart

Figure 10. Simplified state machine

FS23

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

Product data sheet

Rev. 7.0 — 16 October 2024

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