TLE6262G datasheet(7/38 Pages) INFINEON

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Final Data TLE 6262 G

version: 2.03 date: 2002-03-20

CAN Transceiver

The TLE 6262 is optimized for low speed data transmission up to 125 kbaud in

automotive applications. Normally a differential signal is transmitted or received

respectively. When a bus wiring failure (see table 4) is detected the device automatically

switches to a dedicated CANH or CANL single-wire mode to maintain the communication

if necessary. Therefore it is equipped with one differential receiver and four single ended

comparators (two for each bus line). To avoid false triggering by external RF influences

the single wire modes are activated after a certain delay time. As soon as the bus failure

disappears the transceiver switches back to differential mode after another time delay.

The bus failures are monitored via the diagnosis protocol of the SPI. Therefore it is

possible to distinguish 6 CAN bus failures or failure groups on the bits 8 to 13 (see table

3).

To reduce EMC caused by the transceiver 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 (bus-failure) the EMC

performance of the system is degraded from the differential mode.

The differential receiver threshold is set to typ. -2.8 V. This ensures correct reception in

the normal operation mode as well as in the failure cases 1, 2, 3a and 4 with a noise

margin as high as possible. When one of the bus failures 3, 5, 6, 6a, and 7 is detected,

the defective bus wire is disabled by switching off the affected bus termination and output

stage.

The CAN-transceiver offers three different operation modes that are controlled via the

SPI: the normal operation mode, Receive-only mode and Vbat stand-by mode. Please

see the state diagram (figure 3). In the Vbat stand-by mode the RTL output voltage is

switched to VS.

In case of a wake-up via the bus lines or one of the bus lines respectively, the TLE 6262

automatically sets the RxD output LOW. To send respectively receive messages the

CAN-transceiver can now be set in normal operation mode or receive-only mode by the

microcontroller.

When a reset occurs the transceiver circuit is automatically switched to Vbat-stand-by

mode because the SPI input bits are automatically set LOW for this event.

A thermal shutdown of the CAN-transceiver circuit is monitored via the SPI diagnosis

bit 15.

TLE6262G Datasheet(PDF) 7 Page - Infineon Technologies AG