TLE8262E datasheet(34/93 Pages) INFINEON

34 / 93 page

Data Sheet

Rev. 1.0, 2009-03-31

TLE8262E

High Speed CAN Transceiver

Figure 13

Release of the Transmission after Overtemperature

8.4.5

Permanent RxD Recessive Clamping

If the RxD signal is permanently recessive (such as shorted to

cc1µC), although there is a message sent on the

bus, the host microcontroller of this transceiver could start a message at any time because the bus appears to be

idle. To prevent this node from disturbing communication on the bus, the SBC offers permanent RxD recessive

clamping. If the RxD signal is permanently recessive, the failure is diagnosed and the transmitter is deactivated

as long as the error occurs. The transmitter is reactivated after an SPI command.

8.4.6

VccHSCAN Undervoltage

The CAN transceiver cell has no dedicated under voltage detection and use the

CC2 or VCC3 under voltage

circuitry. The µC can switch of the CAN in case of undervoltage.

8.4.7

Bus failures

In case one of the following bus failures is detected by the SBC the interrupt bit CAN BUS is set to “1” and an

interrupt is generated, if not masked. The CAN transceiver does not change the mode due to a detected bus

failure.

Bus Failures

•

CANH short to GND

•

CANH short to Vs

•

CANH short to Vcc

•

CANL short to GND

•

CANL short to Vs

•

CANL short to Vcc

A short of CANH to CANL is detected by the microcontroller as the signal sent on TxD is not received on RxD.

8.5

SPLIT Circuit

SPLIT circuitry is activated during CAN Normal and Receive Only Mode and de-activated (SPLIT pin high ohmic)

during CAN Wake Capable and OFF Modes. The SPLIT pin is used to stabilize the recessive common mode signal

in Normal Mode and RxD Only Mode. This is achieved with a stabilized voltage of 0.5 x

ccHSCAN typical at SPLIT.

A correct application of the SPLIT pin is shown in Figure 14. The SPLIT termination for the left and right nodes is

implemented with two 60

Ω resistors and one 10 nF capacitor. The center node in this example is a stub node and

the recommended value for the split resistances is 1.5 k

Ω.

Failure

Overtemp

TxDCAN

Vdiff

Recessive

Dominant

VCC1µC

Overtemperature

GND

OFF

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