TLE7269G Datasheet, PDF (15/34 Pages) Infineon Technologies AG – Twin LIN Transceiver

4.8
Local Wake-Up
V_WK
WK Signal
V_WK,L
t_WK
TLE7269G
Functional Description
Sleep Mode
Stand-By Mode
INH1/
INH2
Figure 9 Local Wake-Up behavior
Beside the remote Wake-Up, a Wake-Up of the TLE7269G via the WK pin is possible. This type of Wake-Up event
is called “Local Wake Up”. A falling edge on the WK pin followed by a “Low” signal for t > t_WK results in a local
Wake-Up (see Figure 9) and changes the operation mode to Stand-By mode.
In Stand-By mode the TxD1 pin indicates the source of the Wake-Up event, the TxD2 pin remains inactive. A
strong pull-down on the pin TxD1 indicates a bus Wake-Up event (see Figure 4). The RxD1 pin signals if a Wake-
Up event or the Power-Up event occurred. A “Low” signal on the RxD1 pin reports a local or bus Wake-Up event,
a logical “High” signal on RxD1 indicates a Power-Up event. A “Low” signal on the RxD2 pin indicates a Wake-Up
event on the pin BUS2.
4.9
Mode Transition via EN pin
EN Signal V_EN
V_EN,ON
EN Hysteresis
V_EN,OFF
t_MODE
t_MODE
Sleep Mode /
Stand-By Mode
Normal Operation Mode
Sleep Mode
Figure 10 Mode Transition via EN pin
It is also possible to change from Sleep mode to Normal Operation mode by setting the EN pin to logical
“High”.This feature is useful if the external microcontroller is continuously powered and not connected to the INH1
pin or the INH2 pin. The EN pin has an integrated pull-down resistor to ensure the device remains in Sleep or
Stand-By mode even if the voltage on the EN pin is floating. The EN pin has an integrated hysteresis to avoid the
toggling of the operation modes during the transition of the EN signal (see Figure 10).
Data Sheet
15
Rev. 1.2, 2007-11-13