Datasheet

DocID15234 Rev 6 23/40
VNI8200XP Functional pin description
9.11 Programmable watchdog counter reset (WD)
If SEL2 = H, the VNI8200XP embeds a watchdog counter that must be erased, with a
negative pulse on the WD pin, before it expires. If the WD counter elapses, the VNI8200XP
goes into an internal RESET state where all the outputs are disabled; to restart normal
operation a negative pulse must be applied to the WD pin.
The watchdog enable/disable pin should be connected through an external divider to V
REG
.
The watchdog time is fixed in the following Table 14:
Table 14. Programmable watchdog time
V
WD_EN
t
WM
0.25 V
REG
> V
WD_EN
Disable
0.25 V
REG
≤ V
WD_EN
< 0.5 V
REG
40 ± 12% ms
0.5 V
REG
≤ V
WD_EN
< 0.75 V
REG
80 ± 12% ms
0.75 V
REG
≤ V
WD_EN
= V
REG
160 ± 12% ms
Figure 8. Watchdog reset
WD
t WD
t
WM
t
AM11802v1