NXP Semiconductors

FS8600_SDS

Fail-safe system basis chip with multiple SMPSs and LDOs

Pin

Name

Type

Description

11

BUCK_FB

Analog input

Low voltage buck voltage feedback.

12

VMON7_RES

Analog input

External resistor bridge voltage monitoring input #7

13

FS0B

Digital output

Fail-safe output 0. Active low. Open drain structure.

14

VMON8_RES

Analog input

External resistor bridge voltage monitoring input #8

15

VMON1_DAC

Analog input

DAC voltage monitoring input #1

16

PGOOD

Digital output

Power good output

17

RSTB

Digital input/output

Reset output. Active low. The main function is to reset the MCU.

Reset input voltage is monitored in order to detected external

reset and fault condition.

18

VMON2_DAC

Analog input

DAC voltage monitoring input #2

19

VMON3_DAC

Analog input

DAC voltage monitoring input #3

20

VMON9_RES

Analog input

External resistor bridge voltage monitoring input #9. Exclusive with

FIN (OTP)

20

FIN

Digital input

Frequency synchronization input. Exclusive with VMON9_RES

(OTP)

21

GNDFS

Ground

Fail-safe ground

22

GND

Ground

Main ground

23

XFAILB

Digital input/output

Power synchronization input/output with NXP low voltage PMIC

24

AMUX

Analog output

Multiplexed output to be connected to an MCU ADC with selection

of the analog parameter thru I2C.

25

FOUT

Digital output

Frequency synchronization output or digital output (OTP)

26

VMON0_I2C

Analog input

Input voltage for FIN, AMUX, I2C, INTB, FCCU, ERRMON.

Internal resistor bridge voltage monitoring input #0

27

SCL

Digital input

I2C Bus. Clock input

28

SDA

Digital input/output

I2C Bus. Bidirectional data line

29

INTB

Digital output

Interrupt output

30

PRE_COMP

Analog input

VPRE compensation network and negative current sense input

31

VMON5_RES

Analog input

External resistor bridge voltage monitoring input #5

32

PRE_BOOT

Analog input/output

VPRE bootstrap capacitor

33

PRE_GHS

Analog output

VPRE high side gate driver for external MOSFET

34

PRE_SW

Analog output

VPRE switching node

35

PRE_GLS

Analog output

VPRE low side gate driver for external MOSFET

36

ERRMON

Digital input

External IC error monitoring input

37

PRE_CSN

Analog input

VPRE negative current sense input

38

PRE_CSP

Analog input

VPRE positive current sense input

39

PRE_FB

Analog input

VPRE voltage feedback.

40

VBOS

Analog output

Best of supply output voltage

41

WAKE1

Digital/Analog input

Wake up input 1 (thru ext. serial resistor)

Table 3. Pin description...continued

FS8600_SDS

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Product short data sheet

Rev. 2.0 — 7 December 2022

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