Datasheet

ManualsBrandsNXP ManualsDevelopment Boards & KitsEvaluation Board with Installed KL25Z MCU

NXP Semiconductors

UM11193

KITFS85AEEVM evaluation board

User manual Rev. 2.1 — 30 January 2019

11 / 52

Number Description

7 USB connector (for FlexGUI control)

8 Debug connectivity. Access to:

• VSUP, GND

• FOUT/FIN

• PGOOD/RSTB/FS0B

• FCCUx

• WAKE2

• PSYNC, ERRMON, AMUX

• VMONx

9 Programming

• SPI bus

• I2C bus

• Debug pin

• VPRE, VSUP, GND

10 Wake1 switch

11 OTP burning voltage switch

12 VBOOST and BUCK3 power supply

13 DEBUG voltage source either from USB (recommended) or from VSUP

14 PGOOD LED indicator (enabled when jumper is plugged)

15 VDDIO source from device regulators or external sources

16 SPI, RSTB or FS0B can be disconnected between device and MCU

17 RSTB, INTB and FS0B signals available here (device pin level)

18 Allows to select VMON from regulators or a fix 0.8 V

VDDI2C can be selected either 1.8 V or 3.3 V

4.3.1 FS8500/FS8400: Fail-safe system basis chip with multiple SMPS and LDO

4.3.1.1 General description

This device family is part of a global platform FS84 (fit for ASIL B) and FS85 (fit for ASIL

D), pin to pin and software compatible. The FS85/FS84 is an automotive functionally safe

multi-output power supply integrated circuit, with focus on Radar, Vision, ADAS domain

controller, Radio and Infotainment applications. It includes multiple switch mode and

linear voltage regulators. It offers external frequency synchronization input and output, for

optimized system EMC performance.

The FS85/FS84 includes enhanced safety features, with fail-safe output, becoming a full

part of a safety-oriented system partitioning, covering both ASIL B and ASIL D safety

integrity level. It is developed in compliance with ISO 26262 standard. Several device

versions are available, offering choice in number of output rails, output voltage setting,

operating frequency and power up sequencing, to address multiple applications.

4.3.1.2 Features

• 60 V DC maximum input voltage for 12 V and 24 V applications

• VPRE synchronous buck controller with external MOSFETs. Configurable output

voltage, switching frequency, and current capability up to 10 A peak.

• Low voltage integrated synchronous BUCK1 converter, dedicated to MCU core supply

with SVS capability. Configurable output voltage and current capability up to 3.6 A

peak.