TH8082 Datasheet, PDF (15/26 Pages) List of Unclassifed Manufacturers – Single LIN Bus Transceiver

TH8082
Enhanced SoloLIN Transceiver
4. Operating under Disturbance
4.1 Loss of battery
If the ECU is disconnected from the battery, the bus pin is in high impedance state. There is no impact to the
bus traffic and to the ECU itself.
4.2 Loss of Ground
In case of an interrupted ECU ground connection there is no influence to the bus line.
4.3 Short circuit to battery
The transmitter output current is limited to the specified value in case of short circuit to battery in order to
protect the TH8082 itself against high current densities .
4.4 Short circuit to ground
If the bus line is shorted to negative shifted ground levels, there is no current flow from the ECU ground to
the bus and no distortion of the bus traffic occurs.
The permanent failure current from battery to ground can be reduced dramatically by using the INH pin as
termination pin for the master pull up (See Figure 10 - Application Circuitry).
If the controller detects a short circuit of the bus to ground (RxD timeout) the transceiver can be set into
sleep mode. The INH pin is floating and in this case the master pull up resistor is disconnected from the bus
line. Additionally the internal slave termination resistor is switched off and only a high impedance termination
is applied to the bus (typ. 75µA). The failure current of the hole system can be reduced by at least ten times
to prevent a fast discharge of the car battery. If the failure disappears, the bus level will become recessive
again and will wake up the system even if no local wake up is present or possible.
4.5 Thermal overload
The TH8082 is protected against thermal overloads. If the chip temperature exceeds the specified value, the
transmitter is switched off until thermal recovery. The receiver is still working while thermal shutdown.
4.6 Undervoltage Vcc
If the ECU regulated supply voltage is missing or decreases under the specified value, the transmitter is
switched off to prevent undefined bus traffic.
TH8082 – Datasheet
3901008082
Page 15 of 26
Feb 2007
Rev 007