Holtek Semiconductor Inc HT817D0 Datasheet
16.8-Second LOG-PCM Speech
Features
Operating voltage: 3.6V~5.0V
·
Directly drives an external transistor
·
Low standby current (1mA typ. for VDD=3V)
·
Minimal external components
·
508 words table ROM for key functions
·
Programmable silence length and end-pulse
·
width (minimal end-pulse width is 330msata
6kHz sampling rate)
16.8-second voice capacity (based on a 6kHz
·
sampling rate)
Section options
·
-
Retriggerable
-
Non-retriggerable
FLAG1 options
·
-
End-pulse output
-
3HzB flash
-
6HzB flash
-
Voice output indication
-
Busy output
HT817D0
FLAG2 options
·
-
3Hz flash
-
6Hz flash
-
Busy output
12 keys
·
Controllable volume
·
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 6kHz
sampling rate of)
-
One shot (for all KEYs)
-
Level-trigger
-
Pull-high resistance (for all KEYs)
Dice form or 20/24-pin DIP/SOP package
·
Applications
Leisure products
·
Alarm clocks
·
Public address system
·
General Description
The HT817D0 is a single chip LOG-PCM voice
synthesizer LSI with 16.8-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 HT817D0 provides 12 key inputs and 2 pro
grammable FLAG outputs. With a 3.6V~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 section 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 HT817D0 is excellent for
versatile voice applications.
-
1 March 15, 2000
Block Diagram
HT817D0
KEY1
KEY12
OSC1
OSC2
AUD
Pin Assignment
KEY7
KEY8
KEY9
KEY10
KEY11
KEY12
NC
VDD
AUD
OSC2
H T 8 1 7 D 0
20 D IP/SO P
20
1
19
2
18
3
17
4
16
5
15
6
14
7
13
8
12
9
11
10
KEY6
KEY5
KEY4
KEY3
KEY2
KEY1
FLAG 2
VSS
FLAG 1
OSC1
D ebounce
Circuit
O scillator
Circuit
DAC &
O utput
C ontrol
One-shot
Tim e Base
G enerator
Voice RO M
96K ´ 6 -b it
KEY7
KEY8
KEY9
KEY10
KEY11
KEY12
NC
VDD
AUD
OSC2
OSC1
FLAG 1
Key Table
Table R O M
508
´
R O M A ddress
C ounter
1
2
3
4
5
6
7
8
9
10
11
12
24
23
22
21
20
19
18
17
16
15
14
13
H T 8 1 7 D 0
24 D IP/SO P
14-bit
KEY6
KEY5
KEY4
KEY3
KEY2
KEY1
NC
NC
NC
NC
FLAG 2
VSS
Status
Display
C ontroller
VDD
VSS
FLAG 1
FLAG 2
2 March 15, 2000
HT817D0
Pad Assignment
KEY10
KEY11
KEY12
KEY9
1
19
2
3
KEY8
KEY7
KEY6
16
18
17
(0 ,0 )
KEY5
14
15
KEY4
13
KEY3
12
KEY2
11
KEY1
6
4
VDD
5
OSC2
AUD
Chip size: 2270 ´ 3630 (mm)
7
OSC1
10
8
9
VSS
FLAG 1
2
* The IC substrate should be connected to VSS in the PCB layout artwork.
Pad Coordinates
Pad No. X Y Pad No. X Y
1
2
3
4
5
6
-914.50
-914.50
-914.50
-987.90 -1638.25
-254.60 -1611.75
-18.90 -1611.75
7 411.90
8 674.70
9 806.10
10 937.90
1612.75 11 912.80 1115.95
1469.35 12 912.80 1254.55
1278.75 13 912.80 1449.95
14 912.80 1593.55
15 709.50 1564.05
16 179.20 1564.05
-1611.75
-1611.75
-1642.35
17 22.00 1564.05
18
19
-156.40
-734.20
-1611.75
3 March 15, 2000
FLAG 2
Unit: mm
1564.05
1564.05
Pad Description
HT817D0
Pad No. Pad Name I/O
1~3 KEY10~KEY12 I Pull-high
4 VDD
5 AUD O
6 OSC2 O
7 OSC1 I
8 FLAG1 O
9 VSS
10 FLAG2 O
11~19 KEY1~KEY9 I Pull-high
Internal
Connection
¾¾
PMOS
Open Drain
¾
¾
NMOS
Open Drain
¾¾
NMOS
Open Drain
Absolute Maximum Ratings
Description
Trigger key, low active. Key features such as
debounce time, pull-high resistance and repeat
are all by mask option.
Positive power supply
Voice output for driving an external transistor
Oscillator output pin
Oscillator input pin
3HzB/6HzB flash output, busy output,
end-pulse or voice output indication (by mask
option). Open drain, active low output.
Negative power supply, ground
3Hz/6Hz flash output or busy output (by mask
option). Open drain, active low output.
Trigger key, active low. Key features such as
debounce time, pull-high resistance and repeat
are all by mask option.
Supply Voltage ................................-0.3V to 6V
Input Voltage ............... V
Note: These are stress ratings only. Stresses exceeding the range specified under ²Absolute Maxi-
mum Ratings² may cause substantial damage to the device. Functional operation of this device at other conditions beyond those listed in the specification is not implied and prolonged
exposure to extreme conditions may affect device reliability.
-0.3V to VDD+0.3V
SS
Storage Temperature ............... -50°Cto125°C
Operating Temperature .............-20°Cto70°C
4 March 15, 2000
Electrical Characteristics
HT817D0
Symbol Parameter
Test Conditions
V
DD
V
I
I
I
I
V
V
f
DD
DD
STB
O
OL
IH
IL
OSC
Operating Voltage
¾¾
Operating Current 3V No load
Standby Current 3V
Max. AUD Output Current 3V
FLAG Sink Current 3V
²H² Input Voltage ¾¾
²L² Input Voltage ¾¾
Oscillating Frequency 3V
Functional Description
The HT817D0 is a mask ROM type voice synthe
sizer with 16.8-second voice capacity. A group of
pre-recorded voice sections is played upon receipt
of key trigger input signals. Two FLAG signals
are output while playing voices.
The 16.8-second voice capacity can be divided
into sections of arbitrary length. Notice that the
silence length and end-pulse width are not included in the memory.
By using Holtek¢s programming tools, the contents and arrangement of sections, as well as
key features and FLAG output are all programmable before device fabrication.
The IC provides 12 key inputs (KEY1~KEY12).
Of the 12 keys, KEY1 can be optioned as a direct, sequential or random trigger key. KEY12
can be selected as a stop or direct key. As for the
remaining 10 keys (KEY2~KEY11), they are
used as direct keys exclusively.
Conditions
Min. Typ. Max. Unit
3.6
¾¾
V
=0.6V
OH
V
=0.3V
OL
-1.5 -2 ¾
1.5 3.0
0.8V
=530kW
R
OSC
Play function block diagram
-
Key
trigger
76 96 116 kHz
Key
features
option
Playing control logic
¾
0
DD
Key
fu n c tio n
ta b le
ROM
¾
200 400
13
¾
¾
Voice
ROM
0.2V
5.0 V
¾
V
System oscillator
The HT817D0 has a built-in RC oscillator
which requires only one external resistor for
normal applications. The oscillator frequency
is typically 96kHz for an external resistor of
530kW. The required oscillator frequency may
vary with different sampling rates in the pro
cess of voice programming. As a result, the
value of the oscillator resistor may be differ
ent for different items.
DD
DD
D/A
Flag
output
V
mA
mA
mA
mA
V
V
DD
-
-
OSC1
R
HT817D0
OSC2
5 March 15, 2000
OSC
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