M62254 データシートの表示（PDF） - MITSUBISHI ELECTRIC

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M62254

Standard Battery Charger Controller

MITSUBISHI ELECTRIC  

Mitsubishi Semiconductor < DIGI•ANA Interface >

M62254FP

(3) Watch Dog Timer

V DD

TC

5V

VTH+∆VTH

0V

2.7V

0.2V

0V

Standard Battery Charger Controller

VTH

WD

0V

RESET

0V

t RT(1)

td

t RT(2)

t WD

t WDIN

12

34

5

67

8

9

1 When VDD reaches 4.75V (VTH1+∆VTH1); after fixed amount of time (td), Reset pin outputs "High"

and begin charging of the condenser connected TC pin.

2 3 When TC pin reaches 2.7V (VTH2(H)); the condenser connected TC pin begin discharge, and the

Reset pin outputs "Low". During the Reset outputs "High" for the first time; the time of charge will

be tWD + tRT(1), since TC pin begin charging its condenser starting from 0V.

4 When TC pin drops to 0.2V (VTH2(L)); the Reset will outputs "High" again. At same time, TC pin will

begin charging again. Unless correct clock input is given to WD pin, the TC pin will repeats the

charging from 0.2V to 2.7V, and the Reset will also repeats "High" during the tWD cycle, and "Low"

during tRT(2) cycle.

5 6 When correct clock input is given to WD pin before TC pin reaches 2.7V, the Reset holds "High"

output.

7 8 When incorrect clock is given to WD pin, the TC pin will repeats the charging from 0.2V to 2.7V, and

the Reset will also repeats "High" during the tWD cycle, and "Low" during tRT(2) cycle.

9 When VDD drops down to 4.25V (VTH1), the Reset circuit will function, and it will output "Low" to

Reset pin and TC pin changes to discharging state.

(4) Reset circuit

∆VTH1

VTH1

VDD

0.65

RESET

Output

td

1

td

23

1 When VDD reaches 4.75V (VTH1+∆VTH1), the Reset outputs

"High" after fixed amount of time (td).

2 When VDD drops below 4.25V (VTH1), the Reset outputs

"Low"

3 When VDD reaches 4.75V (VTH1+∆VTH1) again, the Reset

outputs "High" after fixed amount of time (td). Also, Reset

output will be "Low" until VDD reaches 0.65V(typ).

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