Datasheet

TLE7269G
Functional Description
Data Sheet 16 Rev. 1.2, 2007-11-13
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
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).
Supply voltage Vs
Power on reset level V
S,UV,PON
Power On reset
Normal Operation
Mode
Reset and
Communication
blocked
Stand-By
Mode
Blanking time t
blank,UV
Supply voltage Vs
Power on reset level V
S,UV,PON
Normal Operation
Mode
Communication
blocked
Blanking time t
blank,UV
Undervoltage level V
S,UV,BLK
Normal Operation
Mode
Under Voltage
Detection V
S
Supply voltage V
IO
Normal Operation
Mode
Communication
blocked
Blanking time t
blank,UV
Undervoltage level V
IO,UV
Normal Operation
Mode
Under Voltage
Detection V
IO