M62055FP データシートの表示（PDF） - MITSUBISHI ELECTRIC

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M62055FP

3V POWER SUPPLY with WATCHDOG TIMER

MITSUBISHI ELECTRIC  

MITSUBISHI<Dig./Ana.INTERFACE>

M62055FP

3V POWER SUPPLY with WATCHDOG TIMER

3. Relationship between the input

pulse width and the low pass filter

3.0V

0.0V

V0

R 1K

VIN

WD

-

C

filter

+

(External Element)

1.5V

Addition of a low pass filter makes input

waveform dull. An input pulse width and CR

of a low pass filter is determined referring to

the right figure.

1.5v

t 3 = -C • R • ln VIN

RESET is output in the case of t 4> t WD.

VIN

3.0v

t3

WD 1.5v

2.4v

TC

1.0v

t

t4

t

2.4v

tWD

t

RESET

t

If t3 is too long, the TC waveform changes as

shown in the diagram above.

t3 is set as follows; tWDIN (3 µs) or more and t 2

(charging time) or less.

(t2 is a discharge time while an input is normal)

APPLICATION

VCC

+

10µF

CIN

VCC

CLM

VD

VO

M62055FP

GND

WD

TC

RESET

CTC

RTC

RRST

GND

CLOCK

MCU/MPU

RESET

VDD

+

10µF

CO

Note : hFE of the external PNP transistor, 100 to 300 is recommended.

MITSUBISHI

(6 / 6 )

970508

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