TLE7269G Datasheet, PDF (16/34 Pages) Infineon Technologies AG – Twin LIN Transceiver

TLE7269G
Functional Description
A transition from logical “High” to logical “Low” on the EN pin changes the operation mode from Normal Operation
mode to Sleep mode. If the TLE7269G is already in Sleep mode, changing the EN from “Low” to “High” results into
a mode change from Sleep mode to Normal Operation mode. If the device is in Stand-By mode a change from
“Low” to “High” on the EN pin changes the mode to Normal Operation mode (see Figure 4).
4.10
Power-On Reset
Supply voltage Vs
Power On reset
Normal Operation
Mode
Reset and
Communication
blocked
Power on reset level V_S,UV,PON
Blanking time t_blank,UV
Stand-By
Mode
Supply voltage Vs
Under Voltage
Detection V_S
Normal Operation
Mode
Communication
blocked
Undervoltage level V_S,UV,BLK
Power on reset level V_S,UV,PON
Blanking time t_blank,UV
Normal Operation
Mode
Supply voltage V_IO
Under Voltage
Detection V_IO
Normal Operation
Mode
Communication
blocked
Undervoltage level V_IO,UV
Blanking time t_blank,UV
Normal Operation
Mode
Figure 11 Power-on reset and Under-Voltage situation
A dropping power supply V_S or a dropping microcontroller supply V_IO on a local ECU can effect the communication
of the whole LIN network. To avoid any blocking of the LIN network by a local ECU the TLE7269G has an
integrated Power-On reset at the supply V_S and an Under-Voltage detection at the supply V_S and the supply V_IO.
In case the supply voltage V_S is dropping below the Power-On reset level V_S < V_S,UV,PON, the TLE7269G changes
the operation mode to Stand-By mode. In Stand-By mode the output stage of the TLE7269G is disabled and no
communication to the LIN bus is possible. The internal bus termination remains active as well as the INH pins (see
Figure 11 and Figure 4).
Data Sheet
16
Rev. 1.2, 2007-11-13