TLE7258D_15 Datasheet, PDF (12/31 Pages) Infineon Technologies AG – TLE7258D

4.5
Bus Wake-up Event
TLE7258D
Functional Description
V_BUS
V_BUS,wk
LIN bus signal
t_WK,bus
Sleep mode
V_BUS,wk
t
Standby mode
EN
TxD
TxD¹⁾: „high impedance“
RxD
RxD: „high“ because of the external pull-up to the microcontroller supply voltage
1) _{In case the TxD input is open}
t
TxD¹⁾: „high“ because of
internal pull-up current source
t
RxD: „low“ indicates bus
wake-up event
t
TLE7258D_BUS_WAKE
Figure 8 Bus wake-up behavior
A bus wake-up event, also called remote wake-up, changes the operation mode from Sleep mode to Standby
mode. A falling edge on the LIN bus, followed by a “dominant” bus signal for the time t_WK,bus results in a bus wake-
up event. The mode change to Standby mode becomes active with the following rising edge on the LIN bus. The
TLE7258D remains in Sleep mode until it detects a state change on the LIN bus from “dominant” to “recessive”
(see Figure 8).
In Standby mode a logical “low” signal on the RxD output indicates a bus wake-up event.
In case the TLE7258D detects a bus wake-up event while already being in Standby mode after power-up, the
wake-up event will be signaled with a logical “low” level on RxD and override the power-on wake source (See
Figure 6).
Data Sheet
12
Rev. 1.2, 2014-12-08