TLE7368G Infineon Technologies, TLE7368G Datasheet - Page 33

• Manufacturer Part Number: TLE7368G
• Description: IC REGULATOR LDO DSO-36
• Manufacturer: Infineon Technologies

Specifications of TLE7368G

• Applications: Automotive
• Voltage - Supply: 4.5 V ~ 45 V
• Operating Temperature: -40°C ~ 150°C
• Mounting Type: Surface Mount
• Package / Case: DSO-36
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Current - Supply: -
• Other names: SP000104573; TLE7368G; TLE7368GNT; TLE7368GT; TLE7368GTR

5.10
Figure 8
Principle of Operation:
A Window Watchdog is integrated in the TLE7368 to monitor a microcontroller. The Window Watchdog duty cycle
consists of an "Open window" and a "Closed window". The microcontroller that is being monitored has to send a
periodic falling edge trigger signal to the watchdog input pin WDI within the "Open Window". If a trigger signal is
not sent or if it is sent during the "Closed Window", then Watchdog Output (WDO) switches from high to low
signaling a potential microcontroller fault has occurred. The watchdog cycle time
T
Initialization:
The Watchdog is switched off per default and activated by pulling WDI to low at least for the time
has turned to high. Watchdog input pin WDI has an integrated pull-up resistor
transitions to high before
the watchdog input WDI should transition to high within the "Ignore Window". The WDI signal may also transition
to high during the following "Open Window", but sufficient time must be left for a falling edge transition before the
end of the "Open Window". The watchdog function is turned off following a RO_2 reset, and must be reinitialized
to be turned back on.
Normal Operation:
Please refer to
The Watchdog starts operating in the "Ignore Window" state for a duration of
the microcontroller is given time to initialize. Any signal to watchdog input WDI within the "Ignore Window" is
ignored. After time
a maximum duration of
Data Sheet
Cycle
. An external capacitor connected between pins RT and GND determines
Watchdog Circuit
Window Watchdog State Diagram
Figure
t
WD,IW
8.
Trigger During
Closed Window
t
, the watchdog transitions from the "Ignore Window" state to the "Open Window" state for
WD,W
t
WD,start
. Within the "Open Window" a valid trigger signal must be applied to the watchdog
has elapsed, then the watchdog will not start operation. To initialize the Watchdog
WDO = LOW
Window
Closed
No Trigger
33
Always
Trigger
No Trigger During
Open Window
Detailed Internal Circuits Description
Window
Window
Ignore
AEA03533.VSD
Open
R
t
WD,IW
Always
WDI
T
T
WD
Cycle
connected to Q_LDO2. If WDI
. Within the "Ignore Window"
is derived from the time base
.
Rev. 2.1, 2010-11-22
t
WD,start
TLE7368
after RO_2