HA16129FPJ View Datasheet(PDF) - Renesas Electronics

Part Name

Description

View to exact match

HA16129FPJ

Single Watchdog Timer

Renesas Electronics 

HA16129FPJ

Calculation Formulas

Item

Reference

voltage

Formula

( Vout = 1.225 1 + 37 // R1

12 // R2

R1, R2; kΩ

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.

Current

limiter

voltage

VCS (150 mV Typ) < IL ⋅ RCS

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

tON

tOFF

—

tRH = 3.3 × CR ⋅ RR

tRL = 1.1 × CR ⋅ RR

tON = 1.1 × CR ⋅ RT

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

Rev.3.00 Jun 15, 2005 page 7 of 22

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