HT817D0 데이터 시트보기 (PDF) - Holtek Semiconductor
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HT817D0 Datasheet PDF : 15 Pages
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HT817D0
16.8-Second LOG-PCM Speech
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 330ms at a
6kHz sampling rate)
· 16.8-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
Applications
· Leisure products
· Alarm clocks
· Public address system
General Description
The HT817D0 is a single chip LOG-PCM voice
synthesizer LSI with 16.8-second voice capacity
at 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 HT817D0 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.
· FLAG2 options
- 3Hz flash
- 6Hz flash
- Busy output
· 12 keys
· Controllable volume
· 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 of)
- One shot (for all KEYs)
- Level-trigger
- Pull-high resistance (for all KEYs)
· Dice form or 20/24-pin DIP/SOP package
· Alert and warning system
· Sound effect generators
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 HT817D0 is excellent for
versatile voice applications.
1
March 15, 2000
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