Data Sheet

6

Rev. 1.0

2017-08-09

HS CAN Transceiver

High Speed CAN Transceiver

High-speed CAN functional description

4

High-speed CAN functional description

HS CAN is a serial bus system that connects microcontrollers, sensors and actuators for real-time control

applications. The use of the Controller Area Network (abbreviated CAN) within road vehicles is described by

the international standard ISO 11898. According to the 7-layer OSI reference model the physical layer of a

HS CAN bus system specifies the data transmission from one CAN node to all other available CAN nodes within

the network. The physical layer specification of a CAN bus system includes all electrical specifications of a CAN

network. The CAN transceiver is part of the physical layer specification. Several different physical layer

standards of CAN networks have been developed in recent years. The TLE9250 is a high-speed CAN transceiver

with a dedicated bus wake-up function as defined in the latest ISO 11898-2 HS CAN standard.

4.1

High-speed CAN physical layer

Figure 3

High-speed CAN bus signals and logic signals

TxD

t

t

CANH

CANL

t

RxD

t

=

Transmitter supply voltage

TxD =

Transmit data input from

the microcontroller

RxD =

Receive data output to

the microcontroller

CANH =

Bus level on the CANH

input/output

CANL =

Bus level on the CANL

input/output

Differential voltage

between CANH and CANL

“dominant” receiver threshold

“recessive” receiver threshold