TLE7257

Functional Description

Data Sheet

14

Rev. 1.0, 2013-10-16

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

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.

Figure 10

Over-temperature shut down

TLE7257_OVER_TEMPERATURE

TxD

t

t

BUS

t

Overtemperature event

Cool down

T

J

t

T

JSD (shutdown temp.)

Switch-on

Δ

T (shutdown hysteresis)

RxD