SM1350 View Datasheet(PDF) - Nippon Precision Circuits
Part Name
Description
MFG CO.
'SM1350' PDF : 21 Pages View PDF
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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