FS23 datasheet(58/230 Pages) NXP

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NXP Semiconductors

FS23

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

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Floating

(ex: door switch open)

GND

(ex: door switch closed)

LOW level

detected

Cyclic sense

activation

HS1

(ex: driven by

timer1).

Door state

HVIO1

Sampling

HIGH level

detected

Flag

generated

Figure 31. Cyclic sense example with HS1 and HVIO1

External components, a serial resistor, and a capacitor-resistor-capacitor filter, are necessary to limit the current

delivered by the high-side driver and protect the high-voltage input pin, used as a global input. See Section 25

for more details.

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FS23

Door

switch

HS1

HVIO1

Figure 32. Cyclic sense schematic example with HS1 and HVIO1

A dedicated open-load detection is implemented to detect hardware disconnection between the HSx and the

associated input pin when cyclic sense is enabled. The overtemperature and overcurrent monitoring features

are also active in Cyclic Sense mode. If any of these faults occurs, the functionality is disabled, and depending

on HS_FLT_WU_FORCE bit, the device can be forced to wake up.

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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