TLE7257

Functional Description

Data Sheet

7

Rev. 1.0, 2013-10-16

4.1

Operating Modes

The TLE7257 has 3 major operation modes (see Figure 4):

•

Normal Operation mode

•

Standby mode

•

Sleep mode

Figure 4

Operation mode state diagram

Table 1

Operating modes

Mode

EN

INH

TxD

RxD

LIN Bus Termination Comments

Sleep

Low

1)

The TxD input is disabled in Sleep mode and the internal pull-up current source is switched off (see Figure 1).

2) A pull-up resistor to the external microcontroller supply is required.

30 kΩ (typical)

No wake-up request detected

Standby

Low

High

3) In case the TxD input is open the state is internally set to logical “high” through the internal pull-up current source.

Low

30 kΩ (typical)

–

Normal

Operation

High High

Low

High

Low

High

30 kΩ (typical)

RxD reflects the signal on the bus

TxD driven by the microcontroller

TLE7257_MODE_DIAGRAM

Normal Operation Mode

INH: High

EN: High

EN

Standby Mode

INH: High

EN: Low

TxD: High

RxD: Low

Power-up

Sleep Mode

INH: Floating

EN: Low

TxD: Disabled

1)

RxD: High

2)

1

4

5

2

3