TLE7259G_07 Datasheet, PDF (7/27 Pages) Infineon Technologies AG – LIN Transceiver

TLE7259G
Functional Description
4.4
Sleep Mode
In order to reduce the current consumption the TLE7259G 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.
Switching the TLE7259G from Normal operation mode to Sleep mode, the EN pin needs to be set to “Low”. A
logical “High” on the EN pin sets the device direct back to Normal operation mode (see Figure 3).
While the TLE7259G is in Sleep mode the following functions are available:
• The output stage is disabled and the internal bus termination is switched off (High Impedance on the Bus pin).
An internal current source on the Bus pin ensures that the level on the Bus pin remains dominate and protects
the LIN network against accidental bus wake-up events.
• The receiver is turned off
• RxD and TxD pins are disabled. The logical state on the TxD pin is low, due to the internal pull-down resistor.
The RxD pin is “High” driven by the external pull-up resistor
• The INH output is switched off and floating.
• The BUS wake-up comparator is active and turns the TLE7259G to Stand-By mode in case of a bus wake-up.
• The WK pin is active and turns the TLE7259G to Stand-By mode in case of a local wake-up.
• The EN pin remains active, switching EN pin to “High“ changes the operation mode to Normal operation.
4.5
Wake-up Events
There are 3 different ways to wake-up the TLE7259G from Sleep mode.
• Bus or also called remote wake-up via a dominate signal on the LIN 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 EN pin to logical “High”.
Data Sheet
7
Rev 2.1, 2007-04-27