Datenblatt-Suchmaschine für elektronische Bauteile |
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SM1125ABV Datenblatt(PDF) 5 Page - Nippon Precision Circuits Inc |
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SM1125ABV Datenblatt(HTML) 5 Page - Nippon Precision Circuits Inc |
5 / 9 page SM1125ABV SEIKO NPC CORPORATION —5 FUNCTIONAL DESCRIPTION Control Functions Reference clock SM1125ABV has built-in RC oscillator circuit (oscillation frequency: 38.4kHz typ). Power-saving function The built-in RC oscillator is stopped when not in playback mode (when ST is LOW), preventing unwanted cur- rent flow. Playback control The ST pin controls the start of playback. While ST is HIGH, the melody is played repeatedly, and when ST goes LOW, playback stops. Melodies are selected by input serial data on pins SI and SC, as shown in table 1. The final 4 serial data bits in any input data string form the valid selection data, and this data is retained even after playback. If serial data is input during playback, the data is ignored and playback continues. Serial data selection Figure 1. Oscillator circuit operation Pin SC should be LOW when either a LOW-to-HIGH or HIGH-to-LOW transition occurs on pin ST. Figure 2. Serial data input timing Table 1. Serial data melody select B3 B2 B1 B0 ST Melody B3 B2 B1 B0 ST Melody LLLL L → H 1st melody L H H L L → H 7th melody LLL H L → H 2nd melody L H H H L → H 8th melody L LHL L → H 3rd melody H L L L L → H 9th melody LL H H L → H 4th melody H L L H L → H 10th melody LHL L L → H 5th melody HLHL L → H 11th melody LHLH L → H 6th melody H L H H L → H 12th melody Melody plays repeatedly when ST is HIGH, and stops immediately when ST goes LOW. Figure 3. Melody repetition timing ST OSC RC Oscillator SI SC ST MTO ?? B3 B2 B1 B0 ? ?? ? Invalid Data Valid Data Invalid Data SI SC ST MTO #n1 Data #n2 Data #n1 Play #n1 Play #n1 Play #n2 Play |
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