Datasheet

Data Sheet 6 Rev. 1.0, 2012-03-01
TLE7250G
Functional Description
4 Functional Description
CAN is a serial bus system that connects microcontrollers, sensors and actuators for real-time control applications.
The use of the C
ontrol 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 within 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 definitions
of CAN networks have been developed in recent years. The TLE7250G is a High Speed CAN transceiver without
a dedicated wake-up function. High Speed CAN transceivers without a wake-up function are defined by the
international standard ISO 11898-2.
4.1 High Speed CAN Physical Layer
Figure 3 High Speed CAN bus signals and logic signals
V
CC
CAN_H
CAN_L
TxD
V
CC
= High Speed 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
V
DIFF
= Differential voltage
between CANH and CANL
V
DIFF
= V
CANH
– V
CANL
RxD
V
DIFF
V
CC
V
CC
t
t
t
t
V
DIFF
= ISO level “dominant“
V
DIFF
= ISO level “recessive“
“dominant“
“recessive“