Datasheet

TLE7250G
Fail-safe Functions
Data Sheet 11 Rev. 1.0, 2012-03-01
Figure 6 Undervoltage detection on
V
CC
5.5 Overtemperature Protection
Figure 7 Overtemperature protection
The TLE7250G has an integrated overtemperature detection circuit to protect the device against thermal
overstress of the transmitter. In case of an overtemperature condition, the temperature sensor will disable the
transmitter (see Figure 1). After the device cools down, the transmitter is activated again (see Figure 7).
A hysteresis is implemented within the temperature sensor.
supply voltage V
CC
power-down reset
level V
CC(UV)
normal-operating
mode
stand-by
mode
normal-operating mode
1)
NEN = 0
NRM = 1
1)
Assuming the logical signals on the pin NEN and on the pin NRM keep its values during the
undervoltage event. In this case NEN remains “low“ and NRM remains “high“.
delay time undervoltage
recovery
t
Delay(UV)
hysteresis
V
CC(UV,H)
TxD
t
t
CANH
CANL
RxD
t
Overtemperature event
T
J
t
T
JSD
(shut-down temperature)
Cool Down
switch-on transmitter
ΔT