Data Sheet
112
Rev. 1.00
2017-07-31
TLE9263BQXV33
Supervision Functions
15.2.4
Watchdog during SBC Stop Mode
The watchdog can be disabled for SBC Stop Mode in SBC Normal Mode. For safety reasons, there is a special
sequence to be followed in order to disable the watchdog as described in
Figure 50
. Two different SPI bits
(
WD_STM_ EN_0
,
WD_STM_ EN_1
) in the registers
WK_CTRL_1
and
WD_CTRL
need to be set.
Figure 50 Watchdog disabling sequence in SBC Stop Mode
If a sequence error occurs, then the bit
WD_STM_ EN_1
will be cleared and the sequence has to be started
again.
The watchdog can be enabled by triggering the watchdog in SBC Stop Mode or by switching back to SBC
Normal Mode via SPI command. In both cases the watchdog will start with a long open window and the bits
WD_STM_EN_1 and WD_STM_ EN_0 are cleared. After the long open window the watchdog has to be served
as configured in the
WD_CTRL
register.
Note:
The bit
WD_STM_ EN_0
will be cleared automatically when the sequence is started and it was 1
before.
Correct WD disabling
sequence
Set bit
WD_STM_EN_1 = 1
Set bit
WD_STM_EN_0 = 1
with next WD Trigger
WD is switched off
Sequence Errors
•
Missing to set bit
WD_STM_EN_0 with the
next watchdog trigger after
having set WD_STM_EN_1
•
Staying in Normal Mode
instead of going to Stop
Mode with the next trigger
Change to
SBC Stop Mode
Before subsequent WD Trigger
Will enable the WD :
•
Switching back to SBC
Normal Mode
•
Triggering the watchdog
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