TH8080KDC Ver la hoja de datos (PDF) - Unspecified

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componentes Descripción

Fabricante

TH8080KDC

SoloLIN Transceiver

Unspecified 

TH8080

SoloLIN Transceiver

3. Functional Description

3.1 Initialization

After power on, the chip enters automatically the recessive state. If the voltage regulator provides the VCC –

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

If the junction temperature TJ is higher than 155°C, the TH8080 will be switched into the thermal shutdown

mode (bus driver will be switched off).

If TJ falls below the thermal shutdown temperature (typ. 140°C) the TH8080 will be switched to the normal

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

diode prevent the reverse current of VBUS during differential voltage between VS and BUS (VBUS>VS).

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 1kΩ 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

->

TxD = high ->

BUS = low (dominant level)

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.

TH8080 – Datasheet

3901008080

Page 10 of 23

July 2004

Rev 006

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