TLE6251-2G

Functional Description

Data Sheet

7

Rev. 1.0, 2009-05-07

4

Functional Description

CAN is a serial bus system that connects microcontrollers, sensor and actuators for real-time control applications.

The usage of the Control 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 CAN bus system

specifies the data transmission from one CAN node to all other available CAN nodes inside the network. The

physical layer specification of a CAN bus system includes all electrical and mechanical 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 over the last years. The TLE6251-2G is a High Speed CAN transceiver

with dedicated Wake - Up functions. High Speed CAN Transceivers with Wake - Up functions are defined by the

international standard ISO 11898-5.

4.1

High Speed CAN Physical Layer

Figure 3

High Speed CAN Bus Signals and Logic Signals

CAN_H

CAN_L

TxD

= Logic Power Supply

= CAN Power Supply

TxD

= Input from the

Microcontroller

RxD = Output to the

Microcontroller

CANH = Voltage on the CANH

Input/Output

CANL = Voltage on the CANL

Input/Output

Differential Voltage

between CANH and CANL

RxD

Dominant

Recessive

t

t

t

t