TH8065 datasheet(13/40 Pages) MELEXIS

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TH8065

Voltage Regulator with LIN Transceiver and Watchdog

TH8065 – Datasheet

Page 13 of 40

3901008065

May 2006

Rev 003

3. Functional Description

The TH8065 consists of a low drop voltage regulator 5V/70mA and a LIN bus transceiver, which is a bi-

directional bus interface for data transfer between LIN bus and the LIN protocol controller.

Additionally integrated is a RESET unit with a power-on-reset delay of 8ms (optional 4,15 or 30ms).

and a programmable watchdog time which will be defined by an external capacity.

3.1 Operating Modes

The TH8065 provides three main operating modes “normal”, “sleep” and “low slew” and the intermediate

states “Ini-state” and “thermal shutdown”. The main modes are fixed states defined by basic actions (VSUP

start, EN or wake-up). The intermediate states are soft states. They aren’t defined by logical actions but by

changes of voltage (VSUP, VCC) or junction temperature.

Set Slew_State = L

Ini-state

VCC > Vres (4.65V) &

Slew_State=L

Sleep-

Mode

EN= H/L

VSUP > UVR_ON &

BUS Wake-up

EN=L

VSUP > UVR_OFF

VSUP < UVR_ON

VCC < Vres

Tj < Tjrec

clear Reset-Timer

Start Regulator -> VCC ramp up

RESET = L

Wake-up disabled

Regulator on

RESET = L / after tres RESET=H

and Watchdog activated

Wake-up disabled

LIN-Transceiver on/ normal slew mode

Normal-

Mode

thermal

shutdown

Regulator off

Thermal shutdown off

Wake-up enabled (LIN-Receiver on)

LIN-Transmitter off

Low Slew

Mode

EN= L/H edge & TxD=L

EN= L/H edge & TxD=H

EN= H/L

UVR / POR

VCC > Vres (4.65V) &

Slew_State=H

VCC < Vres

Regulator on

RESET = L / after tres RESET=H

and Watchdog activated

Wake-up disabled

Set Slew State = H

LIN-Transceiver on/ low slew mode

Tj > Tjshd

Regulator off

Wake-up disabled

LIN-Transceiver off

VSUP power on

Tj > Tjshd

Figure 5 - State diagram of operating modes

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