FS2302M datasheet(94/230 Pages) NXP

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NXP Semiconductors

FS23

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

19.6.2 FS0B

FS0B is an open-drain output that can be used to transition the system in safe state. It is asserted low by

default, and must be released by the MCU in Normal mode. Once released, it is asserted low in case of fault

and depending on the fault impact configuration. In Low-Power modes (LPON and LPOFF), FS0B is asserted

low.

FS0B requires an external pullup resistor to VDDIO or VSUP, a 10 nF filtering capacitor to GND for immunity

when FS0B is a local pin, and an additional RC network when FS0B is a global pin to be robust against ESD

GUN and ISO 7637 transient pulses. An internal pulldown RPD ensures FS0B low level in LPON AND LPOFF

and Power-Up/Down mode. Redundant supplies of the FS0B driver ensure the pin will be driven low when

VSUP is lost. FS0B assertion depends on the device configuration during INIT phase. FS0B can also be

asserted at MCU request by SPI/I2C, to check the correct hardware connection.

aaa-051424

VBOS/V1/VDDIO

LOGIC

FS0B

To fail-safe

circuitry

VDDIO or VSUP

10 nF

22 nF

5.1 kΩ

RPD

Figure 52. FS0B pin implementation

TA = −40 °C to 125 °C, unless otherwise specified. VSUP = 5.5 V to 40 V, unless otherwise specified. All voltages

referenced to ground.

Symbol

Parameter

Min

Typ

Max

Unit

Static electrical characteristics

FS0BVIL

Low-level input voltage

0.7

FS0BVIH

High-level input voltage

1.5

FS0BVOL

Low-level output voltage (I = 2.0mA)

0.5

FS0BRPD

Internal pulldown resistor

MΩ

FS0BILIM

Current limitation

4.0

22.0

Dynamic electrical characteristics

FS0BTFB

Feedback filtering time

µs

FS0BTSC

Short- to high-detection timer

500

650

800

µs

FS0BTFALL

Fall time (pull up to VDDIO = 5 V, 10 nF output capacitor)

µs

External components

FS0BRPU

External pullup resistor to VDDIO (nominal)

5.1

kΩ

FS0BRSER

External serial resistor (optional, 0805 package size)

5.1

kΩ

FS0BCOUT1

External output capacitor (close to the pin)

FS0BCOUT2

External output capacitor (optional, after the serial resistor)

Table 56. FS0B electrical characteristics

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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