HT81XXX
EasyVoice
TM
Speech
Selection Table
Part No.
Mask
HT81003
HT81006
HT81009
HT81012
HT81018
OTP
HT81R03
HT81R09
HT81R18
HT81R36
Voice Capacity
3 sec
6 sec
9 sec
12 sec
18 sec
36 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.
Rev. 1.40
1
March 1, 2005
Features
Operating voltage: 2.4V~5V
Directly drives an external transistor
PWM function directly driver speaker
Low standby current (1
mA typ. for V
DD
=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, 50k
W, 100kW, 200kW
Section options
-
Retriggerable
-
Non-retriggerable
Dice form or 16-pin DIP package
General Description
The EasyVoice
TM
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 compo-
nents.
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 EasyVoice
TM
is
excellent for versatile voice applications.
Applications
Leisure products
Alarm clocks
Alert and warning system
Sound effect generators
EasyVoice
TM
is a trademark of Holtek Semiconductor Inc.
Block Diagram
Pin Assignment
Pad Assignment
HT81006/HT81009
HT81XXX
Rev. 1.40
2
March 1, 2005
I / O 2
I / O 1
K E Y 4
V D D
O S C I
K E Y 1
K E Y 2
K E Y 3
V P P
V S S
O U T 3
V S S
O U T 2
V D D
O U T 1
1 6
1 5
1 4
1 3
1 2
1 1
1 0
9
1
2
3
4
5
6
7
8
H T 8 1 R 0 9 / H T 8 1 R 1 8 / H T 8 1 R 3 6
1 6 D I P - A
O E
I / O 2
I / O 1
K E Y 4
V D D
O S C I
K E Y 1
K E Y 2
K E Y 3
N C
V S S
O U T 3
V S S
O U T 2
V D D
O U T 1
H T 8 1 0 0 6 / H T 8 1 0 0 9
H T 8 1 0 1 2 / H T 8 1 0 1 8
1 6 D I P - A
N C
1 6
1 5
1 4
1 3
1 2
1 1
1 0
9
1
2
3
4
5
6
7
8
D e b o u n c e
C i r c u i t
O n e - s h o t
O s c i l l a t o r
C i r c u i t
T i m e B a s e
G e n e r a t o r
R O M A d d r e s s
C o u n t e r
A u d i o
C o n t r o l l e r
D a t a R O M
I / O 1
I / O 2
S t a t u s
D i s p l a y
C o n t r o l l e r
V D D
V S S
O S C I
S e l e c t o r
O U T 2
O U T 3
O U T 1
K E Y 1 ~ 4
1
2
V D D
O S C I
K E Y 3
V S S
O U T 1
V D D
O U T 2
I / O 2
I / O 1
K E Y 4
K
E
Y
2
K
E
Y
1
O
U
T
3
V
S
S
3
4
5
6
7
8
9
1 0
1 1
1 2
1 3
1 4
( 0 , 0 )
Chip size: 41.9
70.3 (mil)
2
* The IC substrate should be connected to VSS in the PCB layout artwork.
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