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PDF HT81R03 Data sheet ( Hoja de datos )
| Número de pieza | HT81R03 | |
| Descripción | EasyVoiceTM 3-Second Speech | |
| Fabricantes | Holtek Semiconductor Inc | |
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HT81003/HT81R03
Preliminary EasyVoiceTM 3-Second Speech
Features
· Operating voltage: 2.4V~3.6V
· 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)
· 3-sec voice capacity (based on a 5kHz sam-
pling rate)
· Controllable volume
· FLAG1 options
- End-pulse output
- 3Hz, 3HzB flash
- 6Hz, 6HzB flash
- Busy output
- OFF
Applications
· Leisure products
· Alarm clocks
· Public address system
General Description
The HT81003 is a Mask ROM type and
HT81R03 is an OTP type. The HT81003/
HT81R03 is a single-chip voice synthesizer LSI
with 3-second voice capacity at 5kHz sampling
rate. The chip when triggered drives a speaker
through an external transistor with a PWM
output. Negligible current is consumed in the
standby state.
The HT81003/HT81R03 provides 2-key inputs
and 2 programmable FLAG outputs. With
2.4V~5.0V power supply, a complete synthe-
sized voice playback system can be easily built
with very few external components.
· FLAG2 options
- 3Hz flash
- 6Hz flash
- Busy output
- OFF
· 2 keys
· Key options
- Sequential/Directed
- Repeat (KEY2)
- STOP key (KEY2)
- 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
· Dice form or 16-pin DIP package
· Alert and warning system
· Sound effect generators
The customer¢s voice sources are recorded sec-
tion 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 programmable. With such a
flexible structure, the HT81003/HT81R03 is ex-
cellent for versatile voice applications.
EasyVoiceTM is a trademark of Holtek Semiconductor Inc.
1
July 24, 2000
1 page  
Preliminary
HT81003/HT81R03
System oscillator
The EasyVoiceTM has a built-in RC oscillator
which requires only one external resistor for nor-
mal applications. The oscillator frequency is typi-
cally 2MHz for an external resistor of 150kW. The
required oscillator frequency may vary with differ-
ent sampling rates in the process of voice pro-
gramming. As a result, the value of the oscillator
resistor may be different with respect to different
items.
O SCI
H T81003/
H T81R 03
R O SC
The oscillator is turned on when triggered by a
key input. After playing, it is immediately turned
off. Then the chip goes into the standby state.
Voice ROM
The voice ROM is originally designed to continu-
ously record the 3-sec voice data at about 5kHz
sampling rate. A higher sampling rate will gener-
ate voices of better playback quality, but will
shorten the total recording time. On the other
hand, a lower sampling rate will result in longer
recording time but sacrifice the voice quality.
The playback time can be significantly extended
by making use of coding efficiency, silence play-
ing, section repeating, section cascade, etc.
Section
Section is the basic element constituting the
contents of the voice ROM. During program-
ming, the customer¢s voice sources can be di-
vided into as many sections as required. A
section can be composed of a voice or an interval
of silence. However, the silent length is not
counted in the voice ROM. The total number of
sections included should be less than 256 due to
the space limitation of the function table ROM.
The total length of the included sections is lim-
ited by the voice ROM.
A section, when triggered by a key input, can be
played once, repeatedly or cascaded with other
sections, depending on the key function table
instructions.
The following are examples of section division:
E x a m p le 1 : O n e s e c tio n o n ly
s e c .1
ROM
E x a m p le 2 : 3 s e c tio n d iv is io n
s e c .1 s e c .2
ROM
s e c .3
E x a m p le 3 : N s e c tio n d iv is io n
s e c .1 s e c .2
ROM
s e c .N
In addition, a section can be set as retriggerable
or non-retriggerable depending on code option.
· Retriggerable
When the currently playing section is set as
retriggerable, it will stop immediately upon
receipt of other key inputs.
· Non-retriggerable
When the currently playing section is selected
as non-retriggerable, it will go on playing until
the whole section is completed, whether or not
there is a key input in the process of playing.
For a key group, some sections can be set as
retriggerable and some as non-retriggerable.
When a retriggerable section of a key group is
playing, any key can be triggered to interrupt
its playing. If it is a non-retriggerable section
playing, any key interrupt is invalid.
Group
The EasyVoiceTM plays groups according to the
key input. A group can be made up of one or
more sections. When a key is triggered, the cor-
responding group is played. For example, trig-
gering KEY2 plays group 2, and so on. The
same section is allowed to appear in different
groups. However, KEY1 can be made up of mul-
tiple groups when it is optioned as a sequential
key. Otherwise, each key is composed by one
group only.
Key function table
The voice ROM sections are played according to
the instructions of the key function table. The
function table contains group information and
5 July 24, 2000
5 Page 
Preliminary
HT81003/HT81R03
Holtek Semiconductor Inc. (Headquarters)
No.3 Creation Rd. II, Science-based Industrial Park, Hsinchu, Taiwan, R.O.C.
Tel: 886-3-563-1999
Fax: 886-3-563-1189
Holtek Semiconductor Inc. (Taipei Office)
5F, No.576, Sec.7 Chung Hsiao E. Rd., Taipei, Taiwan, R.O.C.
Tel: 886-2-2782-9635
Fax: 886-2-2782-9636
Fax: 886-2-2782-7128 (International sales hotline)
Holtek Semiconductor (Hong Kong) Ltd.
RM.711, Tower 2, Cheung Sha Wan Plaza, 833 Cheung Sha Wan Rd., Kowloon, Hong Kong
Tel: 852-2-745-8288
Fax: 852-2-742-8657
Copyright Ó 2000 by HOLTEK SEMICONDUCTOR INC.
The information appearing in this Data Sheet is believed to be accurate at the time of publication. However, Holtek
assumes no responsibility arising from the use of the specifications described. The applications mentioned herein are
used solely for the purpose of illustration and Holtek makes no warranty or representation that such applications
will be suitable without further modification, nor recommends the use of its products for application that may pres-
ent a risk to human life due to malfunction or otherwise. Holtek reserves the right to alter its products without prior
notification. For the most up-to-date information, please visit our web site at http://www.holtek.com.tw.
11 July 24, 2000
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| PDF Descargar | [ Datasheet HT81R03.PDF ] | |
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