FS6500 datasheet(28/153 Pages) NXP

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NXP Semiconductors

FS6500-FS4500-ASILD

Safety power system basis chip with CAN FD and LIN transceivers

11.5 VCORE output (from 1.0 V to 5.0 V range)

The VCORE block of the FS6500 series is an SMPS regulator. The voltage regulator is a step down DC–

DC converter operating in voltage control mode. The stability of the converter is done externally, by using the

COMP_CORE pin. The VCORE block of the FS4500 series is a linear regulator. In this case, BOOT_CORE and

COMP_CORE pins must be left open.

The output voltage of FS6500/FS4500 is configurable to any voltage from a 1.0 V to 5.0 V range using an

external resistor divider connected between VCORE and the feedback pin (FB_CORE) (as example in Figure 1,

or Figure 73). Current limitation, overvoltage, and undervoltage detectors are provided. VCORE can be turned

on or off via a SPI command, however it is not recommended to turn off VCORE with the SPI when VCORE

is configured safety critical (both overvoltage and undervoltage have an impact on fail-safe outputs). VCORE

overvoltage information disables VCORE. Diagnostics are reported in the dedicated register and generate

an Interrupt. VCORE is enabled by default. For safety purpose, a second resistor bridge (R3/R4 duplicated)

connected to FCRBM should be used to detect an external resistor drift.

11.6 VCCA output, 5.0 V, or 3.3 V selectable

The VCCA voltage regulator is used to provide an accurate voltage output (5.0 V, 3.3 V) selectable through an

external resistor connected to the SELECT pin.

The VCCA output voltage regulator can be configured using an internal transistor delivering very good accuracy

(±1.0 % for 5.0 V and 3.3 V configuration), with a limited current capability (100 mA) for an analog to digital

converter, or with an external PNP transistor, giving higher current capability (up to 300 mA) with lower output

voltage accuracy (±3.0 % for 300 mA) when using a local ECU supply.

Current limitation, overvoltage, and undervoltage detectors are provided. VCCA can be turned on or off via

a SPI command, however it is not recommended to turn off VCCA with the SPI when VCCA is configured

safety critical (both overvoltage and undervoltage have an impact on fail-safe outputs). VCCA overcurrent (with

the use of external PNP only) and overvoltage information disables VCCA. Diagnostics are reported in the

dedicated register and generate an Interrupt. VCCA is enabled by default.

11.7 VAUX output, 5.0 V, or 3.3 V selectable

The VAUX pin provides an auxiliary output voltage (5.0 V, 3.3 V) selectable through an external resistor

connected to SELECT pin. It uses an external PNP ballast transistor for flexibility and power dissipation

constraints. The VAUX output voltage regulator can be used as ’auxiliary supply’ (local ECU supply) or ’sensor

supply’ (external ECU supply) with the possibility to be configured as a tracking regulator following VCCA.

Current limitation, overvoltage, and undervoltage detectors are provided. VAUX can be turned on or off via

a SPI command, however it is not recommended to turn off VAUX with the SPI when VAUX is configured

safety critical (both overvoltage and undervoltage have an impact on fail-safe outputs). VAUX overcurrent and

overvoltage information disables VAUX, reported in the dedicated register, and generates an Interrupt. VAUX is

enabled by default.

11.8 SELECT input pin

11.8.1 VCCA, VAUX voltage configuration

VCCA and VAUX output voltage configurations are set by connecting an external resistor between the SELECT

pin and Ground or the SELECT pin and VPRE. According to the value of this resistor, the voltage of VCCA

and VAUX are configured after each power-on reset, and after a wake-up event when the device is in LPOFF.

Information latches until the next hardware configuration read. Regulator voltage values can be read on the

dedicated register via the SPI. See Figure 75.

FS6500-FS4500-ASILD

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

Product data sheet

Rev. 8 — 5 August 2024

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