FS6500 datasheet(30/153 Pages) NXP

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NXP Semiconductors

FS6500-FS4500-ASILD

Safety power system basis chip with CAN FD and LIN transceivers

When TXD is low, the CANH and CANL drivers are activated and the bus is set to a dominant state. TXD has a

built-in timing protection disabling the bus when TXD is dominant for more than tDOUT. In LPOFF mode, VDDIO

is off, pulling this pin to GND.

11.11.2 RXD

RXD is the bus output level report pin. In the application, this pin is connected to the microcontroller receive pin.

In normal mode, RXD is a push-pull structure. When the bus is in a recessive state, RXD is high. When the bus

is dominant, RXD is low. In LPOFF mode, this pin is in the high-impedance state.

11.11.3 CANH and CANL

These are the CAN-bus pins. CANL is a low-side driver to GND, and CANH is a high-side driver to CAN_5V.

In normal mode and TXD high, the CANH and CANL drivers are off, and the voltage at CANH and CANL is

approximately 2.5 V, provided by the internal bus biasing circuitry. When TXD is low, CANL is pulled to GND

and CANH to CAN_5V, creating a differential voltage on the CAN-bus.

In LPOFF mode, the CANH and CANL drivers are off, and these pins are pulled to GND via the device RIN_CHCL

resistors. CANH and CANL have integrated ESD protection and extremely high robustness versus external

disturbance, such as EMC and electrical transients. These pins have current limitation and thermal protection.

11.12 LIN, TXDL, RXDL

These are the pins of the LIN physical interface. The LIN transceivers provides the physical interface between

the MCU and the physical single wire LIN bus. The LIN interface is connected to the MCU via the RXDL and

TXDL pins.

11.12.1 TXDL

The TXDL input pin is the MCU interface to control the state of the LIN output. TXDL 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 TXDL is high or floating, the LIN output transistor is OFF, setting the bus in recessive

state. When TXDL is low, the LIN output transistor is on and the bus is set to a dominant state. TXDL has a

built-in timing protection disabling the bus when TXDL is dominant for more than TXD_DOM. In LPOFF mode,

VDDIO is off, pulling this pin to GND.

11.12.2 RXDL

RXDL is the bus output level report pin. In the application, this pin is connected to the microcontroller receive

pin. In normal mode, RXD is a push-pull structure. When the bus is in a recessive state, RXD is high. When the

bus is dominant, RXD is low. In LPOFF mode, this pin is in the high-impedance state.

11.12.3 LIN

This is the LIN bus pin. The LIN driver is a low-side MOSFET with internal overcurrent thermal shutdown. An

internal pull-up resistor with a serial diode structure is integrated so no external pull-up components are required

for the application in a responder node. An additional pull-up resistor of 1.0 kΩ must be added when the device

is used in the commander node. In normal mode and TXDL high, the LIN transistor is off, and the voltage at LIN

is approximately VSUP3, provided by the pull-up resistor with a serial diode structure. When TXD is low, LIN is

pulled to GND.

The device has two selectable baud rates: 20 kbit/s for normal baud rate and 10 kbit/s for slow baud rate.

An additional fast baud rate (100 kbit/s) is implemented. It can be used to flash the MCU or in the garage for

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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