HT812D0 View Datasheet(PDF) - Holtek Semiconductor
Part Name
Description
Manufacturer
HT812D0 Datasheet PDF : 15 Pages
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HT812D0
2.8 Second LOG-PCM Speech
Features
• Operating voltage: 2.4V~5.0V
• Directly drives an external transistor
• Low standby current (1µA 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 330µs 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): 700µs,
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
Applications
• Toys
• Alarm clocks
• Public address system
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.
• Alert & 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 HT812D0 is excellent for
versatile voice applications.
1
5th May ’98
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