TLE7269G Datasheet, PDF (11/34 Pages) Infineon Technologies AG – Twin LIN Transceiver

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V_EN,ON
EN
TLE7269G
Functional Description
TxD1
t_TxD,SET
Mode
Transition
t_MODE
Data transmission
t_to,rec
Stand-By Mode / Sleep Mode
Low Slope Mode
Figure 6 Timing to enter Low Slope Mode
4.2.3 Flash Mode
In Flash mode it is possible to transmit and receive LIN messages on the LIN bus. The slew rate control
mechanism of the LIN bus signal is disabled. This allows higher data transmission rates, disregarding the EMC
limitations of the LIN network. The Flash mode is intended to be used during the ECU production for programming
the microcontroller via the LIN bus interface.
The TLE7269G can be set to Flash mode either from Normal Slope mode or from Low Slope mode (see Figure 4).
Flash mode is entered by setting the EN pin to “Low” for the time t_fl1 and generating a falling and a rising edge at
the TxD1 pin with the timing t_fl2, t_fl3 and t_fl4 (see Figure 7). Leaving the Flash mode by the same sequence, sets
the TLE7269G back to its previous state, be that either Normal Slope mode or Low Slope mode. Finally to release
the data transmission it is required to set the TxD1 pin and the TxD2 pin to “High” for the time t_to,rec.
The TLE7269G can be set from Flash mode directly to Sleep mode by switching the EN pin to “Low”. Setting the
pin EN to “High” again, the device will return to Flash mode.
Normal Slope Mode
Low Slope Mode
EN
t_fl1
Flash Mode
Normal Slope Mode
Low Slope Mode
t_fl1
TxD1
Data transmission
t_fl2
t_fl3
t_fl4
t_torec
Figure 7 Timing to enter and exit Flash Mode
t_fl2
t_fl3
Data transm.
t_fl4
t_torec
Data Sheet
11
Rev. 1.2, 2007-11-13