SM1350 查看數據表（PDF） - Nippon Precision Circuits

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SM1350

High Tone Quality Melody LSI

Nippon Precision Circuits  

SM1350 series

FUNCTIONAL DESCRIPTION

Chattering Prevention

STN, STOP chattering prevention function

Standby Mode

The oscillator starts when STN goes from HIGH to

LOW in standby mode. Input data is received and

melody data output starts 81.9 ms after the oscillator

starts if STN is LOW.

Internal

Clock

STN

81.9ms

81.9ms

OSC

Input

Reception

Melody

Output

Note: Refer to the "TIMING DIAGRAMS" section to confirm melody timing specifics.

Figure 1. STN, STOP chattering prevention timing (standby mode)

Oscillator starts running

After the oscillator starts running, input data is

considered valid 81.9 ms after STN and STOP have

last changed state. Input data is considered invalid

for intervals less than 65.5 ms.

Internal

Clock

STN or

STOP

65.5ms

81.9ms

Input

Reception

Note: Refer to the "TIMING DIAGRAMS" section to confirm melody timing specifics.

Figure 2. STN, STOP chattering prevention timing ( oscillator running)

NIPPON PRECISION CIRCUITS—7

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