Data Sheet

7

Rev. 1.0

2016-08-05

TLE8457

LIN Transceiver with integrated Voltage Regulator

Functional Description

Table 1

Operation mode transitions

No. Reason for transition

Comment

1Power-on detection

2

Mode change with EN input

Triggered by logical “high” level

3

4

Mode change with EN and TxD inputs Triggered by logical “low” level on EN and TxD

5

Mode change with EN input

Triggered by logical “high” level

6

Bus wake-up detection

RxD set “low” for signalling the bus wake-up event to the

microcontroller

7

Bus wake-up detection

RxD set “low” for signalling the bus wake-up event to the

microcontroller

8

Initialization watchdog timer

elapsed

Forced transition to Sleep Mode because of no response from

microcontroller after power-on, wake-up, reset or if local errors

9

Mode change with EN and TxD inputs Triggered by logical “low” level on EN while TxD is held “high”

10 Mode change with EN input

Triggered by logical “high” level

11 Bus wake-up detection

RxD set “low” for signalling the bus wake-up event to the

microcontroller

over-temperature event

13 Recovery from LDO over-

temperature event

When over-temperature on the LDO is detected the TLE8457 is

disabled. After recover the device is activated in Init Mode

Table 2

Operating Mode Control

Mode

Control

Functionality

Comments

EN

TxD

NRST

RxD

Sleep

Low

Low

Off

Low

Floating –

Init

Low

On

Low

High

RxD “low” after a bus wake-up

RxD “high” after power-up or reset

Standby

Low

High1)

On

High

High

–

Normal

Operation

High

Low

High

On

High

Low

High

RxD reflects the signal on the bus

TxD driven by the microcontroller