FS6500 datasheet(29/153 Pages) NXP

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NXP Semiconductors

FS6500-FS4500-ASILD

Safety power system basis chip with CAN FD and LIN transceivers

VCCA(V)

VAUX(V)

R select

Recommended value[1]

3.3

<6.0 kΩ

5.1 kΩ ±5.0 %

5.0

10.8 << 13.2 kΩ

12 kΩ ±5.0 %

3.3

5.0

21.6 << 26.2 kΩ

24 kΩ ±5.0 %

5.0

3.3

45.9 << 56.1 kΩ

51 kΩ ±5.0 %

Table 7. VCCA/VAUX voltage selection

[1]

If the SELECT pin is detected open, the VCCA and VAUX regulators start at their minimum output voltage 3.3 V.

11.8.2 Deep fail-safe configuration

Deep fail-safe function is enabled when the SELECT pin is connected to ground and disabled when the

SELECT pin is connected to VPRE. The configuration is done after each power-on reset, and after a wake-up

event when device is in LPOFF by both the main and the fail-safe logics. The Information is latched until the

next hardware configuration read (Figure 11).

aaa-037740

SELECT

RSELECT

SELECT

VPRE

FS6500

Deep fail-safe disabled

Deep fail-safe enabled

FS6500

RSELECT

Figure 11. Deep fail-safe enable/disable

11.9 CAN_5V voltage regulator

The CAN_5V voltage regulator is a linear regulator dedicated to the internal CAN FD interface. An external

capacitor is required. Current limitation, overvoltage, and undervoltage detectors are provided. If the internal

CAN transceiver is not used, the CAN_5V regulator can supply an external load (see Section 12.7.6). CAN_5V

is enabled by default.

11.10 Interrupt (INTB)

The INTB output pin generates a low pulse when an Interrupt condition occurs. The INTB behavior as well as

the pulse duration are set through the SPI during INIT phase. INTB has an internal pull-up resistor connected to

VDDIO.

11.11 CANH, CANL, TXD, RXD

These are the pins of the CAN FD physical interface. The CAN FD transceiver provides the physical interface

between the CAN FD protocol controller of an MCU and the physical dual wires CAN-bus. The CAN FD

interface is connected to the MCU via the RXD and TXD pins.

11.11.1 TXD

TXD is the device input pin to control the CAN-bus level. TXD is a digital input with an internal pull-up resistor

connected to VDDIO. In the application, this pin is connected to the microcontroller transmit pin. In normal

mode, when TXD is high or floating, the CANH and CANL drivers are off, setting the bus in a recessive state.

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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