LAG640D 查看數據表（PDF） - Mitsumi

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LAG640D

IC for Multifunction Telephones

Mitsumi 

MITSUMI

Block Diagram and Application Circuits

IC for Multifunction Telephones LAG640

1. The watchdog timer time is determined by the values of Rw and Cw.

Tt .=. Rw · Cw where Rw is 56k to 560kΩ

Cw is between 0.01µF and 10µF

2. The beep sound frequency is determined by Rb and Cb.

Fb .=. 1/Rb · Cb where Rb is 56k to 330kΩ

Cb is between 4700PF and 22,000PF.

3. The beep sound volume can be varied through the resistance connected to pin 10.

4.7kΩ the voltage is approx. 4VP-P, and at 47kΩ it is about 0.4VP-P.

4. In overload protection operation the voltage across pins 1 to 30 is tested, with a limit of 100 ±20mV.

On load shorting, the test voltage is dropped to about 1/4 to conserve power.

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