HT814D0 Datasheet, PDF (1/15 Pages) Holtek Semiconductor Inc – 8.4-Second LOG-PCM Speech

HT814D0
8.4-Second LOG-PCM Speech
Features
· Operating voltage: 2.4V~5.0V
· Directly drives an external transistor
· Low standby current (1mA typ. for V_DD=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)
· 8.4-second voice capacity (based on a 6kHz
sampling rate)
· 12 keys
· Controllable volume
· FLAG1 options
- _{End-pulse output}
- _{3HzB flash}
- _{6HzB flash}
- _{Voice output indication}
- _{Busy output}
· FLAG2 options
- _{3Hz flash}
- _{6Hz flash}
- _{Busy output}
· 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 sampling
rate of approximate 6kHz)
- _{One shot (for all KEYs)}
- _{Level-trigger}
- _{Pull-high resistance (for all KEYs)}
· Section options
- _{Retriggerable}
- _{Non-retriggerable}
· Dice form or 20/24-pin DIP/SOP package
Applications
· Leisure products
· Alarm clocks
· Public address system
General Description
The HT814D0 is a single chip LOG-PCM voice
synthesizer LSI with 8.4-second voice capacity
at a 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 HT814D0 provides 12 key inputs and 2 pro-
grammable 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 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 HT814D0 is excellent for
versatile voice applications.
1
March 15, 2000