HA16129AFPJ Datasheet, PDF (9/23 Pages) List of Unclassifed Manufacturers – Regarding the change of names mentioned in the document, such as Hitachi Electric and Hitachi XX, to Renesas Technology Corp.

HA16129AFPJ
Calculation Formulas (cont.)
Item
WDT.
Formula
f_Line1
=
0.31
× (Du −
Cf ⋅ Rf
24)
f_Line2 = 24% (fixed)
f_Line3 =
0.024
Cf ⋅ Rf
f_Line4 = 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 f_Line1 to f_Line4 in the figure.
f_Line1
The relationship between
f_Line1 and f_Line3
f_Line1 = f_Line3 × 12.9 (Du − 24)
Du: The P-RUN signal duty cycle
t_H ^tL
Du
=
t_H
t_H +
t_L
×
100
Normal
operation
area
f_Line2
f_Line3
f_Line4
Duty
Rev.1.00 Jun 15, 2005 page 9 of 22