HA16129 データシートの表示（PDF） - Hitachi -> Renesas Electronics
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HA16129 Datasheet PDF : 24 Pages
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HA16129FPJ
Calculation Formulas (cont)
Item
WDT.
Formula
fLine1
=
0.31
× (Du –
Cf · Rf
24)
fLine2 = 24% (fixed)
fLine3 =
0.024
Cf · Rf
fLine4 = 99%
The relationship between
fLine1 and fLine3
fLine1 = fLine3 × 12.9 (Du – 24)
Du: The P-RUN signal duty cycle
tH tL
Du
=
tH
tH +
tL
×
100
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 f Line1 to
fLine4 in the figure.
fLine1
Normal
operation
area
fLine2
fLine3
fLine4
Duty
10
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