TH8061

Voltage Regulator with integrated LIN Transceiver

5. Opera ing during Disturbance

t

5.1

Operating without VSUP or GND

nodes. No reverse supply of the IC can appear if without GND or VSUP connection the BUS pin is on VBAT

level.

5.2

Short Circuit BUS against VBAT

The reaction of the IC depends on the send state of the transceiver:

-

Recessive

LIN bus is blocked, no influence to the TH8061

-

Dominant

Current limitation, thermal shut down of TH8061 if power dissipation will make an

5.3

Short Circuit BUS against GND

LIN bus is blocked. No influence on the TH8061.

5.4

Short Circuit TxD against GND

The LIN transceiver is permanently in the dominant state, that means the whole LIN bus. This state can only

be detected from the LIN controller. In this case the controller must switch off the LIN node via the EN input

of the TH8061. A thermal shut down of TH8061 will appear if the power dissipation and will make an overrun

5.5

TxD open

The internal pull-up resistor forces the LIN node to the recessive state. The communication between the

other bus-nodes will not be disturbed.

5.6

Short Circuit VCC against GND

The VCC pin is protected via a current limitation. This state is comparable with the behaviour in the sleep

mode.

5.7

Overload of VCC

Thermal switch off

temperature of >155°C is reached, the IC will be switched off. The voltage regulator will also be switched off

and a reset signal is forced.

Over current

If the current limitation is active the voltage on VCC drops down. If this voltage under-runs the threshold

5.8

Undervoltage VSUP, VCC

The reset unit ensures the correct behaviour of the driver during under-voltage. The BUS pin generates the

5.9

Short circuit RxD, RESET against GND or VCC

Both outputs are short circuit proof to VCC and ground.

TH8061 – Datasheet

Page 28 of 36

3901008061

June 2004

Rev 007