FS6407 datasheet(56/111 Pages) NXP

56 / 111 page

NXP Semiconductors

FS6407/FS6408

6.8

CAN transceiver

The high speed CAN (Controller Area Network) transceiver provides the physical interface between the CAN protocol controller of an MCU

and the physical dual wires CAN bus. It offers excellent EMC and ESD performance and meets the ISO 11898-2 and ISO11898-5

standards.

Figure 40. CAN simplified block diagram

6.8.1

Operating modes

6.8.1.1

Normal mode

When CAN mode bits configuration is “11” (CAN in normal operation), the device is able to transmit information from TXD to the bus and

report the bus level to the RXD pin. When TXD is high, CANH and CANL drivers are off and the bus is in the recessive state (unless it is

in an application where another device drives the bus to the dominant state). When TXD is low, CANH and CANL drivers are ON and the

bus is in the dominant state. When CAN mode bits configuration is “01” (CAN in listen only), the device is only able to report the bus level

to the RXD pin. TXD driver is OFF and the device is NOT able to transmit information from TXD to the bus. TXD is maintained high by

internal pull-up resistor TXDPULL-UP connected to VDDIO.

CAN_5V

Rin

2.5V

Mode

Control

Differential

Receiver

Wake-up

Receiver

Pre

Driver

TXD

CAN H

CAN L

VDDIO

RXD

Over

Dominant

Temperature

Bus Biasing

and

CAN_5V Monitor

CAN_5V

VDDIO

Pre

Driver

Buffer

Input

VDDIO

time out

VSUP3

Main

WU report

to main loic

Logic

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