TH8082 Datasheet, PDF(3/14 Page) List of Unclassifed Manufacturers

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TH8082 Datasheet, PDF (3/14 Pages) List of Unclassifed Manufacturers – Single LIN Bus Transceiver

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TH8082

Single LIN Transceiver

Functional Description

After power on the chip automatically enters the VBAT-

stanby mode . In this intermediate mode the INH output

will become HIGH (VS) and therefore the voltage regula-

tor will provide the VCC - supply . The transceiver will

remain the VBAT-stanby mode until the controller sets it to

normal operation ( EN = High ) . Only in this mode bus

communication is possible. The TH8082 switches itself in

the VBAT-stanby mode if VCC is missing or below the

threshold.

The sleep mode ( EN = LOW) can only be reached from

normal mode and permits a very low power consumtion

because the transceiver and even the external voltage

regulator get disabled. If the VCC has been switched off a

wake-up request from the bus line will cause the TH8082

to enter the VBAT-stanby mode (VCC is present again) and

sets the RxD output to low until the device enters the

normal operation mode (active LOW interrupt at RxD). If

the INH pin is not connected to the regulator or the inhibi-

table external regulator is not the one that provides the

VCC â supply, the normal mode is directly accessilble by

a logic high on the EN pin.

In order to prevent an unintended wake-up caused by

disturbances of the automotiv environment incoming

dominant signals from the bus have to exceed the wakeâ

up delay time.

Mode Control of TH8082

VCC

Comment

VBAT-standby , power on

VBAT-standby , VCC on , wake up condition after

power on

Normal mode , VCC on

VBAT-standby , VCC missing (VCC<VCCUV)

Sleep mode, switch to VBAT-standby in case of

wake-up request

Sleep mode, regulator not disabled, switch to

VBAT-standby in case wake-up request, directly

switch to normal mode with EN = 1

INH

floating

RxD

Active LOW

wake-up interrupt

1 = recessive bus

0 = dominant bus

VCC

Active LOW wake-up inter-

rupt if VCC is present

Active LOW

wake-up interrupt

Data Sheet Rev 1.0 June 2001

Page 3

www.melexis.com

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