SPSB081 datasheet(22/137 Pages) STMICROELECTRONICS

22 / 137 page

Figure 12. Watchdog with error conditions

OFF

long

open

window

Window

Mode

proper trigger in

Window mode

TRIG = 1

V1 < VRTx

Vbat standby mode

*) forced VBAT: 15x WD fail

7x TSD2

Short V1

Active mode

Fail-Safe

Event

Fail-Safe

Event

forced Vbat stby *)

V1 < VRTx

V1 > VRTx

Figure 13. Watchdog in debug mode

Note:

Whenever the device is operated without servicing the mandatory watchdog trigger events, a sequence

of 15 consecutive reset events is performed and the device is forced into Vbat_Stby mode with bit

FORCED_SLEEP_WD in SR1 set.

If the device is woken up after such a forced Vbat_Stby condition and the watchdog is still not serviced, the

device, after one long open watchdog window is reforced into the same Vbat_Stby mode until the next wake-up

event. In this case, an additional watchdog failure is generated, but the fail counter is not cleared, keeping the

maximum number of 15 failures. This sequence is repeated until a valid watchdog trigger event is performed by

writing TRIG = 1.

SPSB081

Configurable window watchdog

DS14048 - Rev 3

page 22/137

SPSB081 数据表(PDF) 22 Page - STMicroelectronics

SPSB081 数据表(HTML) 22 Page - STMicroelectronics

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

数据表下载