TLE 6251 G

Final Data Sheet

9

Rev. 3.3, 2008-06-19

Reduced Electromagnetic Emission

The bus driver has an implemented control to reduce the electromagnetic emission (EME). This

is achieved by controlling the symmetry of the slope, resp. of CANH and CANL.

Overtemperature

The driver stages are protected against overtemperature. Exceeding the shutdown temperature

results in deactivation of the driving stages at CANH/L. To avoid a bit failure after cooling down,

the signals can be transmitted again only after a dominant to recessive edge at TxD.

Figure 3 shows the way how the transmission stage is deactivated and activated again. First an

overtemperature condition causes the transmission stage to deactivate. After the overtemperature

condition is no longer present, the transmission is only possible after the TxD bus signal has

changed to recessive level.

t

Failure

Overtemp

V

CC

Overtemperature

GND

t

TxD

V

CC

GND

CANH

AET03394.VSD

t

V

CC

V

DR

R

Figure 3

Release of the Transmission after Overtemperature