HA16129FPJ View Datasheet(PDF) - Renesas Electronics

Part Name

Description

View to exact match

HA16129FPJ

Single Watchdog Timer

Renesas Electronics 

HA16129FPJ

Calculation Formulas (cont.)

Item

WDT.

Formula

fLine1

=

0.31

× (Du −

Cf ⋅ Rf

24)

fLine2 = 24% (fixed)

fLine3 =

0.024

Cf ⋅ 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 × 12.9 (Du − 24)

Du: The P-RUN signal duty cycle

tH tL

Du

=

tH

tH +

tL

×

100

Normal

operation

area

fLine2

fLine3

fLine4

Duty

Rev.3.00 Jun 15, 2005 page 9 of 22

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