參數(shù)資料
型號(hào)： L99PM62XP
廠商： STMICROELECTRONICS
元件分類： 電源管理
英文描述： 4-CHANNEL POWER SUPPLY MANAGEMENT CKT, PDSO36
封裝： ROHS COMPLIANT, POWERSSO-36
文件頁(yè)數(shù)： 16/98頁(yè)
文件大?。?/td> 1117K
代理商： L99PM62XP
L99PM62XP
Description
Doc ID 16363 Rev 2
Figure 12. Change watchdog timing within long open window
Figure 13. Change watchdog timing within window mode
If the device is in fail-safe mode, the control registers are locked for writing. To change the
watchdog timing out of fail-safe mode, first the fail-safe condition must be solved, respective
confirmed from the microcontroller. Afterwards the new watchdog timing can be
programmed using the sequence from Figure 14. Since the actions to remove, a fail-safe
condition can differ from the root cause of the fail safe the following diagram shows the
general procedure how to change the watchdog timing out of fail-safe mode. Figure 15
shows the procedure to change watchdog timing with a previous watchdog failure, since this
is a special fail-safe scenario.
long open window
window mode
[timing as programmed in previous SPI command ; e.g. 50 ms]
CSN
write operation
Ctrl Reg 3 WD Time
[e.g. 50 ms]
Feedback:
FSO = 0
write operation accepted
write operation
Ctrl Reg 1 Trig = 1
Feedback:
check FSO = 0
change timing for WD
read operation
Ctrl Reg 3
Feedback:
check FSO = 0
check WD time
write operation
Ctrl Reg 1 Trig = 0
WD timing [e.g. 50 ms]
...
SPI
Command
SPI
Feedback
Watchdog
Mode
window mode [ 10ms]
write operation
Ctrl Reg 3 WD Time
[e.g. 50 ms]
CSN
write operation
Ctrl Reg 1 proper trigger
read operation
Ctrl Reg 3
write operation
Ctrl Reg 1 proper trigger
WD time [10 ms]
window mode [ 50ms]
write operation
Ctrl Reg 1 propper trigger
Feedback:
FSO = 0
write operation accepted
Feedback:
check FSO = 0
change timing for WD
Feedback:
check FSO = 0
check WD time
WD time [50 ms]
...
SPI
Command
SPI
Feedback
Watchdog
Mode
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