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HA16129

Single Watchdog Timer

Hitachi -> Renesas Electronics 

HA16129FPJ

Calculation Formulas

Item

Reference

voltage

Formula

( Vout = 1.225 1 + 37 // R1

12 // R2

R1, R2; kΩ

Current

limiter

voltage

VCS (150 mV Typ) < IL · RCS

Notes

While the Vout voltage will be 5 V ±1.5% when the

Voadj pin is open, the circuit shown here should be

used to change the Vout voltage externally.

VCC CS Vout R1

Voadj

R2

When this function operates, the base current to the

external transistor connected to the CS pin stops and

the Vout output is lowered.

RCS IL

VCC CS Vout

OVP

tRH, tRL

—

tRH = 3.3 × CR · RR

tRL = 1.1 × CR · RR

t ON

tON = 1.1 × CR · RT

t OFF

tOFF = 6.5 × CR · RR

This function prevents the microprocessor from being

damaged if the Vout voltage is inadvertently increased

to too high a level. The OVP detection voltage is fixed.

These determine the reset pulse frequency and duty.

RES

tRL

tRH

Sets the time from the rise of the NMI signal to the point

the RES output is cleared.

NMI

RES

tON

Sets the time from the point the P-RUN pulse stops to

the point a reset pulse is output.

P-RUN

RES

toff

8

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