TLE7259-2GE Datasheet, PDF (12/31 Pages) Infineon Technologies AG – LIN Transceiver

TLE7259-2GE
Functional Description
4.4
Sleep Mode
In order to reduce the current consumption the TLE7259-2GE offers a Sleep mode. In Sleep mode the quiescent
current on V_S and the leakage current on the pin BUS are cut back to a minimum.
To switch the TLE7259-2GE from Normal Operation mode to Sleep mode, the EN pin has to be set to “Low”.
Conversely a logical “High” on the EN pin sets the device directly back to Normal Operation mode (see Figure 4).
While the TLE7259-2GE is in Sleep mode the following functions are available:
• The output stage is disabled and the internal bus terminations are switched off (High Impedance on the pin
BUS). The internal current source on the bus pin ensures that the level on the pin BUS remains recessive and
protects the LIN network against accidental bus Wake-Up events.
• The receiver stage is turned off.
• RxD output pin is “High” if a pull-up resistor is connected to the external microcontroller supply. The TxD pin is
disabled. The logical state on the TxD pin is “Low”, due to the internal pull-down resistor.
• The INH output is switched off and floating.
• The bus Wake-Up comparator is active and turns the TLE7259-2GE to Stand-By mode in case of a bus Wake-
Up event.
• The WK pin is active and turns the TLE7259-2GE to Stand-By mode in case of a local Wake-Up.
• The EN pin remains active, switching the EN pin to “High“ changes the operation mode to Normal Slope mode.
4.5
Wake-Up Events
A Wake-Up event changes the operation mode of the TLE7259-2GE from Sleep mode to Stand-By mode. There
are 3 different ways to wake-up the TLE7259-2GE from Sleep mode.
• Bus Wake-Up via a minimum dominant signal (t_WK,bus) on the pin BUS.
• Local Wake-Up via a minimum dominant time (t_WK) on the WK pin.
• Mode change from Sleep mode to Normal Operation mode, by setting the EN pin to logical “High”.
4.6
Bus Wake-Up via LIN bus
V_BUS
V_BUS,dom
LIN BUS Signal
t_WK,bus
V_BUS,wk
Sleep Mode
INH
Figure 7 Bus Wake-Up behavior
Data Sheet
12
Stand-By Mode
Rev. 1.1, 2008-09-05