TLE8458

Mode Control

Data Sheet

13

Rev. 1.1, 2014-04-01

5.2.3

Stop Mode

The Stop Mode is a Low Power Mode, meaning the quiescent current of the TLE8458 is reduced to a minimum,

while the device is still able to recognized Wake-up events. The following functions are available in Stop Mode:

•

The power supply

V

CC is active and functional.

•

The LIN transceiver output stage is disabled, no communication to the LIN bus is possible.

•

The LIN transceiver input receiver is disabled.

•

The internal LIN bus termination is switched off.

•

The TxD input and the RxD output is inactive.

•

The EN input is active. A HIGH signal on the EN pin changes the operation mode to Normal Operation Mode.

•

The LIN bus Wake-up receiver is active, a Wake-up event on the LIN bus changes the operation mode to

Stand-By Mode.

•

The wake input WK is active, a Wake-up event on the WK pin changes the operation mode to Stand-By Mode.

Entering Stop Mode is only possible from the Normal Operation Mode, regardless if the device is in Normal Slope

Mode or Software Flash Mode. Setting the signal on the EN pin to LOW, followed by a LOW signal on the TxD pin

for the time

t

Mode1 changes the operation mode to Stop Mode (see Figure 4).

5.2.4

Sleep Mode

The Sleep Mode is a Low Power Mode as well, in comparison to the Stop Mode, the quiescent current of the

TLE8458 is even further reduced. In Sleep Mode the TLE8458 is able as well to recognized Wake-up events.

The Wake-up behavior in Sleep Mode is the same as in Stop Mode. The only difference between Sleep Mode and

Stop Mode is, that in Stop Mode the output voltage

V

CC is active, in Sleep Mode the output voltage VCC is disabled.

Sleep Mode can be entered from Normal Operation Mode by setting the EN pin to LOW and simultaneously setting

the TxD pin to HIGH for the time

t

Mode1 (see Figure 4). The Sleep Mode can be also entered from Stop Mode, by

setting the signal on the TxD pin to HIGH for the time

t

Mode1.

5.2.5

Wake-up Events in Sleep and Stop Mode

A Wake-up event in Sleep Mode or Stop Mode changes the operation mode of the TLE8458 to Stand-By Mode.

There are 3 different options to Wake-up the TLE8458 from Sleep Mode or Stop Mode:

•

A bus Wake-up event, caused by a message on the LIN bus.

•

A local Wake-up event, caused by a logical LOW signal on the WK pin.

•

A signal change to logical HIGH on the EN pin.