HA16129 Ver la hoja de datos (PDF) - Hitachi -> Renesas Electronics

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HA16129

Single Watchdog Timer

Hitachi -> 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%

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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