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| HA16129FPJ Datasheet, PDF (9/23 Pages) Hitachi Semiconductor – Single Watchdog Timer | |||
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HA16129FPJ
Calculation Formulas (cont.)
Item
WDT.
Formula
fLine1
=
0.31
à (Du â
Cf â
Rf
24)
fLine2 = 24% (fixed)
fLine3 =
0.024
Cf â
Rf
fLine4 = 99%
Notes
The WDT function judges whether the P-RUN pulse signal is
normal or not. If the WDT function judges the P-RUN pulse
signal to be abnormal, it outputs a reset signal. The normal
range is the area enclosed by fLine1 to fLine4 in the figure.
fLine1
The relationship between
fLine1 and fLine3
fLine1 = fLine3 Ã 12.9 (Du â 24)
Du: The P-RUN signal duty cycle
tH tL
Du
=
tH
tH +
tL
Ã
100
Normal
operation
area
fLine2
fLine3
fLine4
Duty
Rev.3.00 Jun 15, 2005 page 9 of 22
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