TLE 7259-2GU Infineon Technologies, TLE 7259-2GU Datasheet - Page 15

• Manufacturer Part Number: TLE 7259-2GU
• Manufacturer: Infineon Technologies

Specifications of TLE 7259-2GU

• Packages: PG-DSO-8
• Transmission Ratemax: 10.4 kbit/s
• Quiescent Current (max.): < 10 µA sleep mode
• Bus Wake-up Capability: Yes
• Additional Features: INH, EN, WK
• Wake-up Inputs: Bus wake-up + wake-up pin

4.9
If the TxD signal is dominant for a time t > t
signal to the bus and disables the output stage. This is realized to prevent the bus from being blocked by a
permanent “Low” signal on the TxD pin, caused by an error on the external microcontroller (see
The transmission is released again, after a rising edge at the pin TxD has been detected.
Figure 10
4.10
The TLE7259-2GU has an integrated over temperature sensor to protect the device against thermal overstress on
the output stage. In case of an over temperature event, the temperature sensor will disable the output stage (see
Figure
or the TxD pin. When the junction temperature falls below the thermal shut down level
is re-enabled and data communication can start again on the LIN bus. A 10°C hysteresis avoids toggling during
the temperature shut down.
4.11
The TLE7259-2GU can be used for 3.3 V and 5 V microcontrollers. The inputs and the outputs are capable to
operate with both voltage levels. The RxD output must have an external pull-up resistor to the microcontroller
supply to define the output voltage level.
4.12
The TLE7259-2GU has a feature implemented to protect the battery from running out of charge in case the LIN
bus is shorted to GND.
In this failure case a normal master termination, a 1 kΩ resistor and diode between the LIN bus and the power
supply V
GND is in the range of1 kΩ. To avoid this current during a generator off state, like in a parked car, the TLE7259-
2GU has a bus short to GND feature implemented, which is activated in Sleep mode.
Data Sheet
1). An over temperature event will not cause any mode change nor will it be signaled by either the RxD pin
S
, would cause a constantly drawn current even in Sleep mode. The resulting resistance of this short to
TxD Time Out function
TxD Time-Out function
Over Temperature protection
3.3 V and 5 V Logic Capability
BUS Short to GND Feature
BUS
TxD
Normal Communication
TxD Time-Out due to
microcontroller error
t
timeout
timeout
the TxD time-out function deactivates the transmission of the LIN
15
microcontroller error
Recovery of the
t
torec
Release after TxD
Normal Communication
Time-out
T
Functional Description
J
<
Rev. 1.1, 2008-07-14
T
jSD
t
t
TLE7259-2GU
, the output stage
Figure
10).