TH8080

SoloLIN Transceiver

TH8080 – Datasheet

Page 10 of 23

3901008080

July 2004

Rev 006

3. Functional Description

3.1

Initialization

supply voltage, normal communication is possible.

3.2

Operating Modes

All operation modes will be handled from the TH8080 automatically.

Normal Mode

After power on, the IC switches automatically to normal mode. Bus communication is possible.

If there is no communication on the bus line the power consumption of the IC is very low and therefore it is

no standby management from the MCU necessary.

Thermal Shutdown Mode

mode (bus driver will be switched off).

mode.

3.3

LIN BUS Transceiver

The transceiver consists a bus-driver with slew rate control, current limitation and as well in the receiver a

high voltage comparator followed by a debouncing unit.

BUS Input/Output

The recessive BUS level is generated from the integrated 30k pull up resistor in serial with a diode This

No additional termination resistor is necessary to use the TH8080 in LIN slave nodes. If this IC is used for

LIN master nodes it is necessary that the BUS pin is terminated via a external 1k

Ω resistor in serial with a

diode to VBAT.

TxD Input

During transmission the data at the pin TxD will be transferred to the BUS driver for generating a BUS signal.

To minimize the electromagnetic emission of the bus line, the BUS driver is equipped with an integrated slew

rate control and wave shaping unit.

Transmitting will be interrupted if thermal shutdown is active.

The CMOS compatible input TxD controls directly the BUS level:

TxD = low

->

BUS = low (dominant level)

TxD = high

->

BUS = high (recessive level)

The TxD pin has an internal pull up resistor connected to VCC. This secures that an open TxD pin generates

a recessive BUS level.