TLE 6254-3 G

Data Sheet

7

Rev. 2.0, 2005-03-24

Circuit Description

The CAN transceiver TLE 6254-3 G works as the interface between the CAN protocol

controller and the physical CAN bus-lines. Figure 3 shows the principle configuration of

a CAN network.

The TLE 6254-3 G is optimized for low-speed data transmission (up to 125 kBaud) in

automotive and industrial applications.

In normal operation mode a differential signal is transmitted/received. When bus wiring

failures are detected the device automatically switches in a dedicated single-wire mode

to maintain communication.

While no data is transferred, the power consumption can be minimized by multiple low

power operation modes. Further a receive-only mode is implemented.

To reduce radiated electromagnetic emission (EME) the dynamic slopes of the CANL

and CANH signals are both limited and symmetric. This allows the use of an unshielded

twisted or parallel pair of wires for the bus. During single-wire transmission (one of the

bus lines is affected by a bus line failure) the EME performance of the system is

degraded from the differential mode.

In case the transmission data input TxD is permanently dominant, both, the CANH and

CANL transmitting stage are disabled after a certain delay time. This is necessary to

prevent the bus from being blocked by a defective protocol unit or short to GND at the

TxD input.

Figure 3

CAN Network Example

Controller 1

RxD

TxD

Transceiver 1

1

1

Local Area 1

Transceiver 2

Local Area 2

Controller 2

Bus Line

AES02410