Data Sheet

6

Rev. 1.1

2018-10-15

TLE8457C / TLE8457D

LIN Transceiver with integrated voltage regulator

Functional description

4

Functional description

4.1

Operating modes

The operation mode of the TLE8457C / TLE8457D is controlled with the EN and TxD input pins (see Figure 3

and Table 2). The TLE8457C / TLE8457D has 3 major operation modes:

• Normal operation mode

•Standby mode

•Sleep mode

Figure 3

Operation mode state diagram

Table 1

Operation mode transitions

No. Reason for transition

Comment

1Power-on detection

2

Mode change with EN input

range.

3

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

4

functional range.

5

Mode change with EN input

Triggered by logic “high” level.

TLE8457CD_MODE_DIAGRAM

RxD:

logical „high“ after Power-up or transistion with EN input

RxD:

logical „low“ after BUS Wake-up detection

Normal Operation Mode

LIN transceiver: On

LDO regulator: On

EN: High

NRST: High

2)

Sleep Mode

LIN transceiver: Off

LDO regulator: Off

EN: Low

NRST: Low

BUS Wake-up

Power-up

Standby Mode

LIN transceiver: Off

LDO regulator: On

EN: Low

RxD: Wake-up source

1)

NRST: High

2)

2

3

1

4

5

6

7

TxD

- If NRST is „low“ the transceiver is disabled

- NRST will stay „low“ for the time

and NRST=1

EN