TH8082KDC datasheet(12/26 Pages) MELEXIS

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TH8082

Enhanced SoloLIN Transceiver

TH8082 – Datasheet

Page 12 of 26

3901008082

Feb 2007

Rev 007

3. Functional Description

3.1

Initialization

After power on, the chip enters automatically the V

BAT-standby mode. In this intermediate mode the INH

output will become HIGH (VS) and therefore the ECU - voltage regulator will provide the VCC - supply. The

transceiver will remain the VBAT-standby 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-standby mode if

VCC is missing or below the threshold.

3.2

Operating Modes

Via the EN pin it is possible to switch the TH8082 into different operating modes:

Normal Mode

The whole TH8082 is active. Switching to normal mode can only be done via the EN pin with EN=high.

Sleep Mode

The sleep mode (EN = LOW) can only be reached from normal mode and permits a very low power

consumption because the transceiver and even the external voltage regulator will be disabled. If the VCC has

been switched off a wake-up request from the bus line (remote wake up) will cause the TH8082 to enter the

VBAT-standby 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

inhibitable external regulator is not the one that provides the VCC - supply, the normal mode is directly

accessible by logic high on the EN pin. (wake up via mode change/local wake up)

In order to prevent an unintended wake-up caused by disturbances of the automotive environment incoming

dominant signals from the bus have to exceed the wake-up delay time.

Thermal Shutdown Mode

If the junction temperature TJ is higher than 155°C, the TH8082 will be switched into the thermal shutdown

mode. Within this mode the transmitter will be switched off.

If TJ falls below the thermal shutdown temperature (typ. 140°C) the TH8082 will be switched to the previous

state.

3.3

Mode control

VCC

Comment

INH

RxD

VBAT-standby , power on

VBAT-standby , VCC on

Normal mode

Vcc = recessive

0 = dominant

Sleep mode

floating

Sleep mode

regulator not disabled

directly switch to normal mode with EN = 1

floating

Vcc

0/1

Remote wake up request

0 - Active low wake up

interrupt

Table 1 - Mode control

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