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M5295AL

WATCHDOG TIMER

MITSUBISHI ELECTRIC  

MITSUBISHI<Dig.Ana.INTERFACE>

M5295AL/P/FP

WATCHDOG TIMER

TERMINOLOGY

tRST1:Time required for TC pin potential to rise

from 0V VTH3(L) when Vcc is being applied.

tWD: Time required for TC pin potential to rise

from VTH3(L) to VTH3(H).

tRST2:Time required for TC pin potential to go

down from VTH3(H) to VTH3(L).

1.Pin 2 (TC Pin) Charge Time and

Discharge Time

When input to WD pin is abnormal,TC pin output

waveform is as shown below:

TC

0V

tWD

tRST(1)

tRST(2)

tRST(1)=0.51•C•R1

tWD=1.1•C•R1(charge time)

4• R1 -1

tRST(2)=1000•C•in 1000

2• R1

1000

-3

(discharge time)

Vcc

R1

2

C

Resistance R1:10kΩ≤R1≤30kΩ

When R1 is 10kΩ,tRST(2) is 830•C.

2.Pin 1 (WD Pin) Input Frequency,

Input Pulse Width,Charge Time and

Discharge Time

When input to WD pin 1 is normal,TC pin 2 output

waveform is as shown below:

(Vcc=5V)

4V

Pin 2 xV

2V

t1 t2

4

5 •Vcc

Input

2

5 •Vcc

tWDIN

t1=C•R1•in

3

5-x

(charge time)

t2=1000•C•in

R1

1000

+1

x-5

2• R1 -3

1000

(discharge time)

PIN 1 (WD PIN)INPUT REQUIREMENTS

(1)Connect capacitor between WD pin and voltage input.

(Refer to Section 3.)

(2)Input cycle:No more than tWD

(Discharge should start before voltage at WD pin

reaches 4V.)

1

<f

1.1•C•R1

(3)Input pulse width tWDIN:No more than t2

C=104

1ms t

C=103

100µs

t1

Vcc=5V

50µs 0.5

ms

R1=10kΩ

MITSUBISHI

ELECTRIC

t2

234

DISCHARGE VOLTAGE x(V)

( 4/8 )

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