Data Sheet

13

Rev. 1.2, 2007-11-13

TLE7269G

Functional Description

4.4

Sleep Mode

In order to reduce the current consumption the TLE7269G offers a Sleep mode. In Sleep mode the quiescent

current on

V

To switch the TLE7269G from Normal Operation mode to Sleep mode, the EN pin has to be set to “Low”.

Conversely a logical “High” on the EN pin sets the device directly back to Normal Operation mode (see Figure 4).

While the TLE7269G is in Sleep mode the following functions are available:

•

The output stages are disabled and the internal bus terminations are switched off (High Impedance on the pins

BUS1 and BUS2). Internal current sources on the bus pins ensure that the levels on the pins BUS1 and BUS2

remain recessive and protect the LIN network against accidental bus Wake-Up events.

•

The receiver stages are turned off.

•

RxD1, RxD2 output pins are inactive and “High resistive”. The TxD1, TxD2 pins are disabled. The logical state

on the TxD1 pin and the TxD2 pin is “Low” due to the internal pull-down resistors.

•

The INH1 and INH2 outputs are switched off and floating.

•

The bus Wake-Up comparator is active and turns the TLE7269G to Stand-By mode in case of a bus Wake-Up

event.

•

The WK pin is active and turns the TLE7269G to Stand-By mode in case of a local Wake-Up.

•

The EN pin remains active, switching the EN pin to “High” changes the operation mode to Normal Operation

mode.

4.5

Wake-Up Events

A Wake-Up event changes the operation mode of the TLE7269G from Sleep mode to Stand-By mode. Both

integrated transceivers are changing the mode.

There are 4 different ways to Wake-Up the TLE7269G from Sleep mode.

•

Bus or also called remote Wake-Up via a dominant signal on the pin BUS1.

•

Bus or also called remote Wake-Up via a dominant signal on the pin BUS2.

•

Local Wake-Up via a minimum dominant time (

t

•

Mode change from Sleep mode to Normal Operation mode, by setting EN pin to logical “High”.

4.6

Wake-Up Bus2 Off

A Wake-Up event on the LIN bus1 or on the bus2 wakes up the TLE7269G and sets it to Stand-By mode. In

applications where a Wake-Up via bus1 is required but a Wake-Up via bus2 is not wanted, the bus Wake-Up event

on the BUS2 can be disabled. This is done by setting the W2O pin to “High”. During the mode change from Normal

Operation mode to Sleep mode the TLE7269G checks for the status on the pin W2O. In case the W2O pin is

“High”, the Wake-Up feature for the transceiver 2 will be disabled. The TLE7269G can still be wake off by a bus

Wake-Up event on LIN bus1 or by a local Wake-Up event on the pin WK. A bus Wake-Up event on the bus 2 won’t

be recognized and the device remains in Sleep mode (see Figure 4).

In case the Wake-Up Bus2 Off feature is not used, the W2O pin can be left open, due to the internal pull-down

resistor, a not connected W2O pin is set to logical “Low”. The function of the EN pin remain unchanged.