TLE7257

Functional Description

Data Sheet

13

Rev. 1.0, 2013-10-16

4.6

Mode Transition via EN input

Figure 9

Entering Normal Operation mode from Sleep mode

The EN input is used for operation mode control of the TLE7257. By setting the EN input logical “high” for the time

t

The EN input has an integrated pull-down resistor to ensure the device remains in Sleep or Standby mode even

if the EN pin is left open. The EN input has an integrated hysteresis.

A signal transition from logical “high” to “low” on the EN input changes the operation mode from Normal Operation

mode to Sleep mode (see Figure 5).

The TLE7257 changes the operation modes regardless of the signal on the BUS pin. In the case of a short circuit

between the LIN bus and GND, resulting in a permanent “dominant” signal, the TLE7257 can be set to Sleep mode

by setting the EN input to logical “low”.

After a mode change to Normal Operation mode, a logical “high” signal for the time

t

required to release the data communication.

TLE7257_ENABLE

V

EN,OFF

Sleep mode

t

to,rec

V

EN,ON

Hysteresis

Normal Operation mode

Sleep mode

t

EN

t

Data transmission

RxD

t

Data transmission

TxD

1)

INH

t

MODE

t

MODE

INH: „high impedance“

INH: „high impedance“

t