HT81xxx
EasyVoiceTM Speech
Features
· Operating voltage: 2.4V~5V
· Directly drives an external transistor
· PWM function directly driver speaker
· Low standby current (1mA typ. for VDD=3V)
· Minimal external components
· 240 notes table ROM for key functions
· Programmable silence length and end-pulse width
(minimal end-pulse width is 1.3ms at 8kHz sampling
rate)
· Controllable volume
· FLAG1 options
- End-pulse output
- 3Hz, 3HzB flash
- 6Hz, 6HzB flash
- Busy output
- OFF
· FLAG2 options
- 3Hz flash
- 6Hz flash
- Busy output
- OFF
· 6 keys (Directed)
· 8 keys (Matrix key)
· Key options
- Sequential/Directed
- Repeat (KEY2~KEY6)
- STOP key (KEY6)
- Key debounce time: 1.2ms, 22ms, 45ms
(based on a 8kHz sampling rate)
- One shot/Normal
- Pull-high resistance: 0, 50kW, 100kW, 200kW
· Section options
- Retriggerable
- Non-retriggerable
· Package types:
HT81006/009/012/018: 16-pin DIP package
HT81R09/R18/R36: 16-pin SOP package
Applications
· Leisure products
· Alarm clocks
· Alert and warning system
· Sound effect generators
General Description
The EasyVoiceTM is a single-chip voice synthesizer LSI .
The chip when triggered drives a speaker directly or
through an external transistor with a PWM output. Negli-
gible current is consumed in the standby state.
The HT81xxx provides direct key or Matrix key input and
2 programmable FLAG outputs. With 2.4V~5.0V power
supply, a complete synthesized voice playback system
can be easily built with very few external components.
The customer¢s voice sources are recorded section by
section into an internal mask ROM. The instructions of
section playback arrangement of each key are stored in
the table ROM. The key features are also programma-
ble. With such a flexible structure, the EasyVoiceTM is
excellent for versatile voice applications.
Selection Table
Part No.
Mask
OTP
HT81003
HT81R03
HT81006
HT81009
HT81R09
HT81012
HT81018
HT81R18
Voice Capacity
3 sec
6 sec
9 sec
12 sec
18 sec
Note: The voice capacity is calculated based on 5kHz sampling rate.
For 3-second capacity HT81003/HT81R03 devices, refer to the its relevant data sheet.
HT81R36
36 sec
EasyVoiceTM is a trademark of Holtek Semiconductor Inc.
Rev. 1.60
1
May 25, 2018
