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參數(shù)資料
| 型號： | 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 |
| 文件頁數(shù)： | 17/98頁 |
| 文件大?。?/td> | 1117K |
| 代理商： | L99PM62XP |
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Description
L99PM62XP
Doc ID 16363 Rev 2
Figure 14. General procedure to change watchdog timing out of fail safe mode
Figure 15. Change watchdog timing out of fail safe mode (watchdog failure)
2.5
Fail safe mode
2.5.1
Single failures
L99PM62XP enters fail safe mode in case of:
●
Watchdog failure
●
V1 turn on failure
–V1 short (V1 < V1fail for t > 4 ms)
●
V1 undervoltage (V1 < Vrth for t > 8 s)
●
Thermal shutdown TSD2
●
SPI failure
–
DI stuck to GND or VCC (SPI frame = ’00 00 00’ or ‘FF FF FF’
Actions to exit
Fail safe Mode
Procedure to Write new Watchdog timing
long open window
CSN
window mode
[timing as programmed in previous SPI command ; e.g. 50 ms]
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 time [e.g. 50 ms]
...
Fail Safe Mode active
Fail Safe Mode inactive
SPI
Command
SPI
Feedback
Watchdog
Mode
Procedure to Write new Watchdog timing
Actions to exit
Fail safe Mode
write operation
Ctrl Reg 3 WD Time
[e.g. 50 ms]
Feedback:
FSO = 1
write operation blocked
CSN
write operation
Ctrl Reg 1 Trig = 1
Feedback:
FSO = 1
provide propper trigger
read operation
any valid address
Feedback:
check FSO = 1
quit fail safe mode
write operation
Ctrl Reg 3 WD Time
[e.g. 50 ms]
Feedback:
FSO = 0
write operation accepted
write operation
Ctrl Reg 1 Trig = 0
Feedback:
check FSO = 0
change timing for WD
read operation
Ctrl Reg 3
Feedback:
check FSO = 0
check WD time
long open window
window mode [ 10ms]
WD time [10 ms]
window mode
[timing as programmed in previous SPI command ; e.g. 50 ms]
write operation
Ctrl Reg 1 proper triger
WD time [e.g. 50 ms]
...
Fail Safe Mode active
Fail Safe Mode inactive
SPI
Command
SPI
Feedback
Watchdog
Mode
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