TLE7258D_15 Datasheet, PDF (13/31 Pages) Infineon Technologies AG – TLE7258D

4.6
Mode Transition via EN input
TLE7258D
Functional Description
EN
RxD
TxD ¹⁾
V_EN,ON
t_MODE
t_to,rec
V_EN,OFF
Data transmission
Data transmission
Sleep mode
Normal Operation mode
1) _{The TxD signal is driven from the external microcontroller}
Hysteresis
t
t_MODE
t
t
Sleep mode
TLE7258D_ENABLE
Figure 9 Entering Normal Operation mode from Sleep mode
The EN input is used for operation mode control of the TLE7258D. By setting the EN input logical “high” for the
time t_MODE while being Sleep or Standby mode, a transition to Normal Operation mode will be triggered (see
Figure 9). 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 TLE7258D 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 TLE7258D 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_to,rec on the TxD input is
required to release the data communication.
Data Sheet
13
Rev. 1.2, 2014-12-08