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HT818D0 Datasheet(PDF) 1 Page - Holtek Semiconductor Inc |
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HT818D0 Datasheet(HTML) 1 Page - Holtek Semiconductor Inc |
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1 / 14 page  HT818D0 22.4-Second LOG-PCM Speech 1 March 15, 2000 Features · Operating voltage: 3.6V~5.0V · Directly drives an external transistor · Low standby current (1mA typ. for VDD=3V) · Minimal external components · 508 words table ROM for key functions · Programmable silence length and end-pulse width (minimal end-pulse width is 330msata 6kHz sampling rate) · 22.4-second voice capacity (based on a 6kHz sampling rate) · Section options - Retriggerable - Non-retriggerable · FLAG1 options - End-pulse output - 3HzB flash - 6HzB flash - Voice output indication - Busy output · FLAG2 options - 3Hz flash - 6Hz flash - Busy output · Controllable volume · 12 keys · Key options - Stop key: KEY12 - Random (only for KEY1) - Sequential (only for KEY1) - Repeat (for all KEYs) - Key debounce time (for all KEYs): 700ms, 22ms, 45ms, 180ms (based on a 6kHz sampling rate) - One shot (for all KEYs) - Level-trigger - Pull-high resistance (for all KEYs) · Dice form or 20/24-pin DIP/SOP package General Description The HT818D0 is a single chip LOG-PCM voice synthesizer LSI with 22.4-second voice capacity at a 6kHz sampling rate. The chip when trig- gered drives a speaker through an external transistor with a current switch D/A converter output. Negligible current will be consumed in the standby state. The HT818D0 provides 12 key inputs and 2 pro- grammable FLAG outputs. With a 3.6V~5.0V power supply, a complete synthesized voice playback system can be easily built with very few external components. The customer¢s voice sources are recorded sec- tion by section into an internal mask ROM. The sectional playback arrangement instructions of each key are stored in the table ROM. The key features are also programmable. With such a flexible structure, the HT818D0 is excellent for versatile voice applications. Applications · Leisure products · Alarm clocks · Public address system · Alert and warning system · Sound effect generators |
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