Holtek Semiconductor Inc HT815D0 Datasheet
11.2-Second LOG-PCM Speech
Features
Operating voltage: 2.4V~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)
11.2-second voice capacity (based on a 6kHz
·
sampling rate)
FLAG1 options
·
–
End-pulse output
–
3HzB flash
–
6HzB flash
–
Voice output indication
–
Busy output
FLAG2 options
·
–
3Hz flash
–
6Hz flash
–
Busy output
HT815D0
Controllable volume
·
12 keys
·
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 6kHz)
–
One shot (for all KEYs)
–
Level-trigger
–
Pull-high resistance (for all KEYs)
Section options
·
–
Retriggerable
–
Non-retriggerable
Dice form or 16/20/24-pin DIP,
·
20/24-pin SOP package
Applications
Leisure products
·
Alarm clocks
·
Public address system
·
General Description
The HT815D0 is a single chip LOG-PCM voice
synthesizer LSI with 11.2-second voice capacity
at 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 HT815D0 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 & 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 HT815D0 is excellent for
versatile voice applications.
-
1 March 15, 2000
Block Diagram
HT815D0
KEY1
KEY12
OSC1
OSC2
AUD
Pin Assignment
1
NC
NC
2
NC
3
NC
4
VDD
5
6
AUD
OSC2
OSC1
7
8
H T815D 0
1 6 D IP
16
15
14
13
12
11
10
9
D ebounce
Circuit
O scillato r
Circuit
DAC &
O utput
C ontrol
NC
NC
KEY3
KEY2
KEY1
FLAG 2
VSS
FLAG 1
O ne-shot
Tim e Base
G enerator
Speech R O M
64K ´ 6 -b it
KEY7
KEY8
KEY9
KEY10
KEY11
KEY12
NC
VDD
AUD
OSC2
Key Table
Table R O M
508 ´13-bit
Address
C ounter
20
1
19
2
18
3
17
4
16
5
15
6
14
7
13
8
12
9
11
10
H T815D 0
20 DIP/SO P
ROM
KEY6
KEY5
KEY4
KEY3
KEY2
KEY1
FLAG 2
VSS
FLAG 1
OSC1
Status
Display
C ontroller
KEY7
KEY8
KEY9
KEY10
KEY11
KEY12
NC
VDD
AUD
OSC2
OSC1
FLAG 1
VDD
VSS
FLAG 1
FLAG 2
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 815D 0
24 DIP/SO P
KEY6
KEY5
KEY4
KEY3
KEY2
KEY1
NC
NC
NC
NC
FLAG 2
VSS
2 March 15, 2000
HT815D0
Pad Assignment
KEY10
KEY11
KEY12
KEY9
1
2
3
KEY8
KEY7
(0 ,0 )
KEY6
KEY5
14
13
12
11
KEY4
KEY3
KEY2
KEY1
15 16 17 18 19
VDD
4
5 6
AUD
OSC2
Chip size: 2270 ´ 2840 (mm)
7
OSC1
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 -1241.95
-254.60 -1215.45
-18.90 -1215.45
7 411.90
8 674.70
9 806.10
10 937.90
1216.45 11 912.80 719.65
1073.05 12 912.80 858.25
882.45 13 912.80 1053.65
14 912.80 1197.25
15 709.50 1167.75
16 179.20 1167.75
-1215.45
-1215.45
-1246.05
17 22.00 1167.75
18
19
-156.40
-734.20
-1215.45
3 March 15, 2000
8
FLAG 1
Unit: mm
1167.75
1167.75
10
9
FLAG 2
VSS
Pad Description
HT815D0
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
NMOS
Open Drain
¾¾
NMOS
Open Drain
Absolute Maximum Ratings
¾
¾
Description
Trigger key, active low. 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 op
tion). 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
HT815D0
Electrical Characteristics
Symbol Parameter
V
I
I
I
I
V
V
f
OSC
DD
STB
O
OL
Operating Voltage
DD
Operating Current 3V No load
Standby Current 3V
Max. AUD Output Current 3V
FLAG Sink Current 3V
²H² Input Voltage ¾¾
IH
²L² Input Voltage ¾¾
IL
Oscillating Frequency 3V
Test Conditions
V
DD
¾¾
Functional Description
The HT815D0 is a mask ROM type voice synthe
sizer with 11.2-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 11.2-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, 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. The re
maining 10 keys (KEY2~KEY11), are used as
direct keys exclusively.
Conditions
Min. Typ. Max. Unit
2.4
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
P la y c o n tro l lo g ic
¾
0
DD
Key
fu n c tio n
ta b le
ROM
¾
200 400
13
¾
¾
Voice
ROM
5.0 V
¾
V
0.2V
System oscillator
The HT815D0 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 re
quired oscillator frequency may vary with differ
ent sampling rates in the process of voice
programming. As a result, the value of the oscilla
tor resistor may be different for different items.
OSC1
DD
DD
D/A
Flag
output
Ta=25°C
mA
mA
mA
mA
V
V
V
DD
-
-
-
H T 815D 0
OSC2
5 March 15, 2000
R
OSC
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