HT812D0 Datasheet, PDF (1/15 Pages) Holtek Semiconductor Inc – 2.8 Second LOG-PCM Speech

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