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CF5762AB0 Datasheet(PDF) 7 Page - Nippon Precision Circuits Inc |
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CF5762AB0 Datasheet(HTML) 7 Page - Nippon Precision Circuits Inc |
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7 / 10 page  CF5762AB0 NIPPON PRECISION CIRCUITS INC.—7 MELODY FUNCTION DESCRIPTION Melodies There are 4 melodies stored, and which can be played hourly. Time Function If the following conditions are satisfied when a HIGH-level hourly signal is input on MT, then hourly melody output occurs. The hourly melody is a combination of melody output and subsequent chime signals. MT has a built-in pull-down resistor. The number of chimes played are determined by time detection in 12-hour mode. <Melody conditions> 1. The hourly signal turns OFF once before turning ON 2. Melody stop at night function is not set for cur- rent time interval (see “Melody Stop at Night”) 3. Melody stop when dark function is not active (see “Melody Stop when Dark”) If S1 to S4 are all HIGH (no chime), then condition number 2 is ignored. If the time information inputs change state and an hourly signal on MT is input during melody output, the output stops and then starts again under the new conditions. Melody Select Switching The melody to be played is selected by the state of SEL1 and SEL2. SEL1 and SEL2 have built-in pull- down resistors. <Melody switch function> Time Detection The time information inputs are only read when the hourly signal is input on MT. At all other times the internal data does not change, even if the time infor- mation inputs change state. The hours 1 through 12 are represented in 12-hour mode with an internal PM flag. The PM flag reverses state when the hour switches from 11 to 12, or from 12 to 11 if the time setting is being reversed to adjust to the correct time. When the S1 to S4 inputs are all HIGH, the melody output plays without chimes. These inputs determine the time detection and are read into internal registers when the hourly signal is input on MT. Other input combinations not shown are invalid. S1 to S4 have built-in pull-down resistors. SEL1 SEL2 Melody (hourly signal) LOW LOW Melody 1 + chime HIGH LOW Melody 2 + chime LOW HIGH Melody 3 + chime HIGH HIGH Melody 4 + chime S4 S3 S2 S1 Time LOW LOW LOW HIGH 1 o’clock LOW LOW HIGH LOW 2 o’clock LOW LOW HIGH HIGH 3 o’clock LOW HIGH LOW LOW 4 o’clock LOW HIGH LOW HIGH 5 o’clock LOW HIGH HIGH LOW 6 o’clock LOW HIGH HIGH HIGH 7 o’clock HIGH LOW LOW LOW 8 o’clock HIGH LOW LOW HIGH 9 o’clock HIGH LOW HIGH LOW 10 o’clock HIGH LOW HIGH HIGH 11 o’clock HIGH HIGH LOW LOW 12 o’clock LOW LOW LOW LOW No change HIGH HIGH HIGH HIGH No chime |
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