TLE7257 Datasheet, PDF (14/31 Pages) Infineon Technologies AG – LIN Transceiver

TLE7257
Functional Description
4.7
Over-Temperature Protection
The TLE7257 has an integrated over-temperature sensor to protect the device against thermal overstress on the
transmitter. In case of an over-temperature event, the transmitter will be disabled (see Figure 10). An over-
temperature event will not cause any mode change and will not be directly indicated on the RxD output or the TxD
input.
When the junction temperature falls below the thermal shut down level T_J < T_JSD, the transmitter will be
reactivated. After an over-temperature recovery the TxD input requires a logical “high” signal before restarting data
transmission.
A 10°C hysteresis avoids toggling during the temperature shut down.
T_{JSD (shutdown temp.)}
T_J
Overtemperature event
BUS
TxD
RxD
Figure 10 Over-temperature shut down
ΔT (shutdown hysteresis)
Switch-on
Cool down
t
t
t
t
TLE7257_OVER_TEMPERATURE
Data Sheet
14
Rev. 1.0, 2013-10-16