TLE7259-2GE Datasheet, PDF (13/31 Pages) Infineon Technologies AG – LIN Transceiver

TLE7259-2GE
Functional Description
The bus Wake-Up event, often called remote Wake-Up, changes the operation mode from Sleep mode to Stand-
By mode. A falling edge on the LIN bus, followed by a dominant bus signal t > t_WK,bus results in a bus Wake-Up
event. The mode change to Stand-By mode becomes active with the following rising edge on the LIN bus. The
TLE7259-2GE remains in Sleep mode until it detects a change from dominant to recessive on the LIN bus (see
Figure 7).
In Stand-By mode the TxD pin indicates the source of the Wake-Up event. A weak pull-down on the pin TxD
indicates a bus Wake-Up event (see Figure 4). The RxD pin signals if a Wake-Up event occurred or the power-
up event. A “Low” signal on the RxD pin reports a local or bus Wake-Up event, a logical “High“ signal on RxD
indicates a power-up event.
4.7
Local Wake-Up
WK Signal
V_WK
V_WK,L
t_WK
Sleep Mode
Stand-By Mode
INH
Figure 8 Local Wake-Up behavior
Beside the remote Wake-Up, a Wake-Up of the TLE7259-2GE 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 8) and changes the operation mode to Stand-By mode.
In Stand-By mode the TxD pin indicates the source of the Wake-Up event. A strong pull-down on the pin TxD
indicates a bus Wake-Up event (see Figure 4). The RxD pin signals if a Wake-Up event or the Power-Up event
occurred. A “Low” signal on the RxD pin reports a local or bus Wake-Up event, a logical “High“ signal on RxD
indicates a Power-Up event.
Data Sheet
13
Rev. 1.1, 2008-09-05