Data Sheet

17

Rev. 1.2, 2007-11-13

TLE7269G

Functional Description

In Stand-By mode the RxD1 pin signals the low power supply condition with a “High” signal. A logical “High” on

the EN pin changes the operation mode back to Normal Operation mode.

In case the supply voltage

V

disables the output and receiver stages. This feature secures the communication on the LIN bus. If the power

supply

V

operation. A mode change only applies if the power supply

V

V

If the power supply

V

disabled as well. When

V

with normal operation and data transmission.

4.11

TxD Time Out function

of the LIN signal to the bus and disables both, the output stage 1 and the output stage 2. This is realized to prevent

the bus from being blocked by a permanent “Low” signal on the TxD1 or TxD2 pin, caused by an error on the

external microcontroller (see Figure 12).

The transmission is released again, after a rising edge at TxD1 or TxD2 has been detected.

Figure 12

TxD Time-Out function

TxD1

BUS1

TxD2

BUS2

Normal Communication

Normal Communication

TxD Time-Out due to

microcontroller error

Release after TxD

Time-out

Recovery of the

microcontroller error

Normal Communication

Normal Communication

TxD Time-Out due to

microcontroller error

Release after TxD

Time-out

Recovery of the

microcontroller error

t

t

t

t