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Data Sheet
108
Rev. 1.00
2017-07-31
TLE9263BQXV33
Supervision Functions
15.2
Watchdog Function
The watchdog is used to monitor the software execution of the microcontroller and to trigger a reset if the
microcontroller stops serving the watchdog due to a lock up in the software.
Two different types of watchdog functions are implemented and can be selected via the bit
WD_WIN
:
•
Time-Out Watchdog (default value)
•
Window Watchdog
The respective watchdog functions can be selected and programmed in SBC Normal Mode. The configuration
stays unchanged in SBC Stop Mode.
Please refer to
Table 27
to match the SBC Modes with the respective watchdog modes.
The watchdog timing is programmed via SPI command. As soon as the watchdog is programmed, the timer
starts with the new setting and the watchdog must be served. The watchdog is triggered by sending a valid
SPI-write command to the watchdog configuration register. The trigger SPI command is executed when the
Chip Select input (CSN) becomes HIGH.
When coming from SBC Init, SBC Restart Mode or in certain cases from SBC Stop Mode, the watchdog timer is
always started with a long open window. The long open window (t
LW
= 200ms) allows the microcontroller to
run its initialization sequences and then to trigger the watchdog via SPI.
The watchdog timer period can be selected via the watchdog timing bit field (
WD_TIMER
) and is in the range
of 10 ms to 1000 ms. This setting is valid for both watchdog types.
The following watchdog timer periods are available:
•
WD Setting 1: 10ms
•
WD Setting 2: 20ms
•
WD Setting 3: 50ms
•
WD Setting 4: 100ms
•
WD Setting 5: 200ms
•
WD Setting 6: 500ms
•
WD Setting 7: 1000ms
In case of a watchdog reset, SBC Restart or SBC Fail-Safe Mode is entered according to the configuration and
the SPI bits
WD_FAIL
are set. Once the RO goes HIGH again the watchdog immediately starts with a long open
window the SBC enters automatically SBC Normal Mode.
In SBC Development Mode the watchdog is OFF and therefore no reset and interrupt are generated due to a
watchdog failure.
Table 27 Watchdog Functionality by SBC Modes
SBC Mode
Watchdog Mode
Remarks
INIT Mode
Starts with Long Open
Window
Watchdog starts with Long Open Window after RO is
released
Normal Mode
WD Programmable
Window Watchdog, Time-Out watchdog or switched
OFF for SBC Stop Mode
Stop Mode
Watchdog is fixed or OFF
Sleep Mode
OFF
SBC will start with Long Open Window when
entering SBC Normal Mode.
Restart Mode
OFF
SBC will start with Long Open Window when
entering SBC Normal Mode.
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