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HT812D0 Datasheet(PDF) 1 Page - Holtek Semiconductor Inc |
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HT812D0 Datasheet(HTML) 1 Page - Holtek Semiconductor Inc |
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1 / 15 page  HT812D0 2.8 Second LOG-PCM Speech Features • Operating voltage: 2.4V~5.0V • Directly drives an external transistor • Low standby current (1 µA Typ. for VDD=3V) • Minimal external components • 124 words table ROM for key functions • Programmable silence length and end-pulse width (minimal end-pulse width is 330 µs at a 6kHz sampling rate) • 2.8-second voice capacity • Controllable volume • FLAG1 options: – End-pulse output – 3Hz flash – 6Hz flash – Voice output indication – Busy output • FLAG2 options: – 3Hz flash – 6Hz flash – Busy output • Four keys • Key options: – Stop key: KEY4 – Random (only for KEY1) – Sequential (only for KEY1) – Repeat (for all KEYs, under retriggerable condition) – Key debounce time (for all KEYs): 700 µs, 22ms, 45ms, 180ms (based on a sampling rate of approximately 6kHz) – One shot (for all KEYs) – Level-trigger – Pull-high resistance (for all KEYs) • Section options: – Retriggerable – Non-retriggerable General Description The HT812D0 is a single chip LOG-PCM voice synthesizer LSI with 2.8-second voice capacity at 6kHz sampling rate. The chip when triggered 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 HT812D0 provides four key inputs and two programmable FLAG outputs. With a 2.4V~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 HT812D0 is excellent for versatile voice applications. Applications • Toys • Alarm clocks • Public address system • Alert & warning system • Sound effect generators 1 5th May ’98 |
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Similar Description - HT812D0 |
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