Datasheet

8

Rev. 1.11

2019-09-19

High Speed CAN Transceiver

TLE9251V

High-speed CAN functional description

5

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 TLE9251V is a high-speed CAN

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

5.1

High-speed CAN physical layer

Figure 3

High-speed CAN bus signals and logic signals

TxD

VIO

t

t

VCC

CANH

CANL

t

VCC

VDiff

RxD

VIO

t

VIO

=

Digital supply voltage

VCC

=

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

VDiff =

Differential voltage

between CANH and CANL

VDiff = VCANH – VCANL

“dominant” receiver threshold

“recessive” receiver threshold

tLoop(H,L)

tLoop(L,H)