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HT812D0 Datasheet

  • HT812D0

  • 2.8 Second LOG-PCM Speech

  • 616.45KB

  • 15頁(yè)

  • HOLTEK

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HT812D0
2.8 Second LOG-PCM Speech
Features
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Operating voltage: 2.4V~5.0V
Directly drives an external transistor
Low standby current (1
碌
A 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
碌
s at a
6kHz sampling rate)
2.8-second voice capacity
Controllable volume
FLAG1 options:
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End-pulse output
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3Hz flash
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6Hz flash
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Voice output indication
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Busy output
FLAG2 options:
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3Hz flash
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6Hz flash
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Busy output
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Four keys
Key options:
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Stop key: KEY4
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Random (only for KEY1)
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Sequential (only for KEY1)
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Repeat (for all KEYs, under retriggerable
condition)
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Key debounce time (for all KEYs): 700
碌
s,
22ms, 45ms, 180ms (based on a sampling
rate of approximately 6kHz)
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One shot (for all KEYs)
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Level-trigger
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Pull-high resistance (for all KEYs)
Section options:
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Retriggerable
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Non-retriggerable
Applications
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Toys
Alarm clocks
Public address system
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Alert & warning system
Sound effect generators
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鈥檚 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.
1
5th May 鈥?8

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