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MM1099AD

System Reset (Built-in Watch Dog Timer)

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Block Diagram

System Reset (Built-in Watch Dog Timer) MM1099

MM1099A

MM1099B

RA

~ - 305k

~ - 350k

RB

~ - 195k

~ - 150k

Note 1. Cp = approx. 0.1µF

Note 2. C ~- 1000pF

Note 3. The watchdog timer can be stopped by grounding the RCT pin.

(Function as voltage detection circuit.)

Note 4. TPR, TWD can be varied by pulling up the RCT pit to VCC using a resisteor.

Timing Chart

VCC

VSH

VSL

0.3V

CK

TCK

CT

RESET

TPR

TWD TWR

TPR

12

34 5 5

67

89

10

11 12

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