M5295AL Ver la hoja de datos (PDF) - MITSUBISHI ELECTRIC

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M5295AL

WATCHDOG TIMER

MITSUBISHI ELECTRIC  

OPERATING EXPLANETION

VTH2(H)

Vcc

VTH1

0V

VTH3(H)

VTH3(L)

TC

0V

VIN

0V

MITSUBISHI<Dig.Ana.INTERFACE>

M5295AL/P/FP

WATCHDOG TIMER

VTH2(L)

VTH1

RST1

0V

RST2

0V

tRST(1)

tWD

tRST(2)

12 3

45

6

78

9 10 11

1 The Vcc rises up to 0.8V,then Reset1 and 2

generate Low output,and Rising up to 4.25V,charge

of C1 begins.

2 The Vcc rises up to 4.7V,then Reset2 generates

high.

3 , 4 The voltage at TC pin is 2V,then Reset2 generates

high,when 4V,C1 is discharged and Reset1

generates Low.

5 The voltage at TC pin falls to 2V,then Reset1

generates high unless normal clock signal is entered

to WD pin,Reset1 repeats this operation.

6 , 7 Before the voltage at TC pin reaches 4V,if normal

clock signal is entered to WD pin,Low Reset1 is

canceled.

8 , 9 In the case of entrance of abnormal signal input,

as the waveform of TC pin repeats charge and

discharge of Reset1 alternatively from 2V to 4V,the

Reset1 repeats high and low output operation.

10 The Vcc falls to 4.6V,then Reset2 generates Low,

this detective voltage has a 100mV hysteresis.

11 When Vcc goes down to 4.25V(VTH1),the status of

TC pin is switched to discharge.When the potentional

at TC pin is detected being VTH3(H) or VTH3(L),the

status of Reset1 becomes "low".

MITSUBISHI

ELECTRIC

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