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
HT815D0
The oscillator is turned on when triggered by a
key input. After playing, it is immediately turned
off and the chip goes into the standby state.
Voice ROM
The voice ROM is originally designed to continu
ously record the 11.2-second voice data at a 6kHz
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 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 silence length is not
counted in voice ROM. The total number of sec
tions included should be less than 508 due to
the space limitation of the function table ROM.
The total length of the included sections is limited 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:
Exam ple 1: O ne section only
sec.1
ROM
Exam ple 2: 3 section division
sec.1 sec.2 se c.3
ROM
Exam ple 3: N section division
sec.2 sec.Nsec.1
ROM
In addition, a section can be set as retriggerable or
non-retriggerable depending on the 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 till
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. On the other hand, if it is a
non-retriggerable section is playing, any key in
-
-
terrupt is ignored.
Group
The HT815D0 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 immediately. For
example, triggering KEY2 plays group 2, and so
on. The same section is allowed to appear in different groups. However, KEY1 can be made up
of multiple groups when it is optioned as a sequential or random key. Otherwise, each key is
composed of one group only.
Key function table
The sections in the voice ROM are played according to the instructions of key function table. The function table contains group
information as well as playing order of sections
in the groups. Notice that the total number of
sections included in the groups should be less
than 508-the space limitation of the function
table ROM.
-
-
6 March 15, 2000
HT815D0
·
KEY1 as a direct key
Each key is mapped to a group in the
function table. If a key is not used, the group
mapped to that key is a piece of silence. The
following is an example of the function table:
Group 1 sec.1 + sec.2 + sec.3 + sec.5
Group 2 sec.3
Group 3 sec.2 + sec.2 + sec.3 + sec.4
Group 4 sec.5 + sec.3
As illustrated in the above table, the voice ROM
is composed of 5 sections and the function table
of 11 sections. If KEY1 is momentarily trig
gered, section 1, section 2, section 3 and section
5 are played in sequence and then stops. Trig
gering KEY2 plays section 3, and so on.
·
KEY1 as a sequential or random key
When KEY1 is optioned as a sequential or ran
dom key, it can include multiple groups
(sub-groups) in the function table. However,
the remaining 11 keys (KEY2~KEY12) are used
as direct keys exclusively and comprise only
one group in the function table. Below is an ex
-
ample:
Group 1-1 sec.4 + sec.2
Group 1-2 sec.1 + sec.3
:
:
:
:
Group 1-N sec.2 + sec.3
Group 2 sec.2 + sec.3
Group 3 sec.3 + sec.5
Group 4 sec.1 + sec.5 + sec.2
-
-
As indicated in the above table, KEY1 can be
made up of sub-groups. The corresponding
sub-groups are played in sequence each time
KEY1 is triggered.
¨
The playing sequence of sequential KEY1 is:
-
Group 1-1 ® Group 1-2 ® Group 1-3 ..... ®
Group 1-N (the last group) ® Group 1-1 .....
¨
The playing sequence of random KEY1 is:
Group 1-3 ® Group 1-5 ..... ® Group 1-N ®
Group 1-3 ® Group 1-5 .....
KEY1
KEY2~KEY12
AUD
KEY1
KEY2~KEY12
(Silence)
AUD
G roup 1-1 G roup 1-2 G roup 1-N
G roup (2~12)
Figure 1 Reset of KEY1 playing sequence
N pulse
G roup 1-N
M pulse
Figure 2 KEY1 sub-group selection
7 March 15, 2000
G roup 1-1
G roup 1-M
HT815D0
That KEY1 functions as a random key is a special
case of sequential key, which combines a particu
lar arrangement of sub-group playing sequence.
¨
Reset of KEY1 playing sequence
If a sub-group of KEY1 group is being played
and one of KEY2~KEY12 is triggered, the
playing sub-group will be terminated, and
the newly triggered key group is played in
stead. The first sub-group will start playing
by retriggering KEY1. In other words, the
KEY1 playing sequence is reset whenever a
key other than KEY1 is triggered (see Figure
1).
¨
Sub-group selection
When KEY1 is triggered with pulses, the de
sired sub-group can be selected by controlling
its corresponding pulse number. However,
the features of KEY1 have to be set in the fol
lowing ways:
–
sequential or random
–
retriggerable
–
minimum key debounce time
(@700ms, f
OSC
=96kHz)
For instance, if sub-group 1-3 is the previous
playing group, sub-group 1-5 will start playing
after 2 pulses are applied to KEY1, and so on.
To make easy selection of KEY1 sub-groups,
one of KEY2~KEY12 should be programmed
as silence. Then this silence key has to be
triggered to reset KEY1. By so doing, the
playing sub-group of KEY1 is directly specified by the pulse number applied to KEY1
(see Figure 2).
·
KEY12 as a stop key (by mask option)
When KEY12 functions as a stop key, any
voice output can be stopped by pressing
KEY12.
·
KEY1~KEY11 as a repeat key
KEY1~KEY11 all function as repeat keys if
one of the eleven keys is set as a repeat key. In
other words, once the mode of one of
KEY1~KEY11 is determined, the remaining
10 keys are set accordingly.
As a repeat key, the sections included can be
played sequentially and repeatedly till other
key input is triggered. KEY12 has no other
choice but functions as a stop key when
KEY1~KEY11 are set as repeat keys.
Key features
·
-
Key priority
When two or more keys are triggered simulta
neously, the output voice is determined by the
key priority as shown below:
KEY1>KEY2>......KEY11>KEY12
·
Key debounce time
-
There are four kinds of key-in debounce time
that can be selected by mask option, namely,
700ms, 22ms, 45ms and 180ms. The key
-
debounce time varies with the value of the sys
tem frequency.
·
Pull-high resistance
Four kinds of key input pin pull-high resis
tance can be selected by mask option,
namely, 20kW, 50kW, 100kW and 200kW.
The resistance may vary with VDD, tem
peratures and the chip itself due to process
variations.
·
Trigger mode
All of the 12 keys can be optioned as one-shot
trigger mode, level-trigger mode or level hold
mode.
¨
One shot
When one of the 12 keys (KEY1~KEY12) is
pressed momentarily or held down, the
group corresponding to that key will play
once.
KEY N
AUD
G roup N
G roup N
-
-
-
-
8 March 15, 2000
Level trigger
¨
When one of the 12 keys is pressed and held
down, the corresponding group will keep
playing. Once the pressed key is released,
the group will not stop till the included sec
tions are all completed.
HT815D0
AUD
FLAG
-
: F loating
KEY N
AUD
¨
Level hold
G roup N
G roup N
G roup N
When one of the 12 keys is pressed and held
down, the group corresponding to that held
key will play. When the pressed key is re
leased, the group will immediately stop re
gardless of the rest.
KEY N
AUD
G roup N
G roup N
G roup N
FLAG
When voices are playing, both FLAG1 and
FLAG2 pins are activated to output one of the
following signals through code option.
FLAG1 can be optioned as one of the following
signal outputs:
None, 3HzB flash, Busy, 6HzB flash, Voice indicator, or End-pulse output
FLAG2, on the other hand, can be set as one of
the following signal outputs:
None, 3Hz flash, 6Hz flash, or Busy output
·
3Hz/3HzB flash
When voices are playing, the FLAG1 as well
as FLAG2 pins output a 3Hz signal to drive
an LED. The signal is active low, 25% duty.
Once the voice output is terminated, the
FLAG1 and FLAG2 pins become floating out
puts. When the FLAG1 and the FLAG2 pins
are optioned as 3HzB and 3Hz outputs, they
will be alternately output at a 3Hz rate.
·
6Hz/6HzB flash
When voices are playing, the FLAG1 pin
outputs a 6Hz signal to drive an LED. The
signal is active low, 25% duty. Once the voice
output is terminated, the FLAG1 pin be
comes a floating output. When the FLAG1
and the FLAG2 pins are optioned as 6HzB
-
-
and 6Hz outputs, they will be alternately
output at a 6Hz rate.
AUD
FLAG
: F loating
·
Busy output
When a voice group is playing, the outputs of
both FLAG1 and FLAG2 are turned low, indicating that the chip is busy.
AUD
FLAG
: F loating
In addition to the above-stated output sig
nals, FLAG1 can also generate one of the fol
-
lowing signals by code option:
-
9 March 15, 2000
HT815D0
Voice indicator output
¨
FLAG1 is active low when voices are play
ing. FLAG1 is also turned low when a voice
section is output. The brightness of FLAG1
varies with the volume. FLAG1 becomes a
floating output after the silence section is
output or the voice output is terminated.
AUD
FLAG
: F loating
¨
End-pulse output
When the voice output is completed, the
FLAG1 pin outputs an active low pulse. The
pulse width can be programmed depending
on the customer¢s requirements.
The FLAG1 and FLAG2 pins are both float
ing outputs when the chip is in the standby
state.
AUD
Volume control
-
The function of volume control can be set by
mask option. A code is written in the function
table for the purpose of controlling the volume
of each section output after the volume control
function is chosen. There are two volume op
tions, namely, full range and half range.
AUD
The AUD pin is a PMOS open drain structure.
It outputs voice signals to drive a speaker
through an external NPN transistor when the
chip is active. However, the AUD pin becomes
floating when the chip is in the standby state.
The 8050 type transistor with h
FE
ommended for an output driver.
OSC1
VDD
R
OSC
-
OSC2
AUD
VSS
8050
H T 815D 0
@150 is rec
V
DD
SPK
-
-
FLAG
: F loating
10 March 15, 2000
Application Circuits
General application
HT815D0
SPK
8
KEY10
KEY11
KEY12
KEY9
1
2
3
KEY8
KEY7
KEY6
KEY5
KEY4
14
13
12
11
KEY3
KEY2
KEY1
15 16 17 18 19
H T815D 0
V
DD
VDD
W
8050
4
R
R
5 6
AUD
OSC2
Rosc
8
7
OSC1
10
9
FLAG 1
FLAG 2
VSS
* The IC substrate should be connected to VS S in the P C B layout artw ork.
V
DD
19
20
21
22
23
24
1
2
3
4
5
6
11
KEY1
KEY2
KEY3
KEY4
KEY5
KEY6
KEY7
KEY8
KEY9
KEY10
KEY11
KEY12
OSC1
H T815D 0
Rosc
VDD
FLAG 1
FLAG 2
AUD
NC
NC
NC
NC
NC
VSS
OSC2
8
12
14
9
7
15
16
17
18
13
10
R=100W~330
R
R
SPK
8
W
8050
W
11 March 15, 2000
Parallel application
100W~
100W~
330
330
W
W
FLAG1 VDD OSC2 OSC1
FLAG 2 FLAG1 VDD OSC2 OSC1
H T 815D 0
VSS KEY1 KEY12
Cascade or external driving
HT815D0
V
DD
100W~
100W~
330
R
OSC
AUD
330
W
W
FLAG 2
R
OSC
H T 815D 0
VSS KEY1 KEY12
AUD
V
8050
DD
R
OSC
OSC2 OSC1
VSS
KEY1
Power-on play (one shot)
0.1mF
KEY
R
FLAG 1
KEY12
OSC
1.2M
AUD
100W~
330
W
FLAG 1
H T 815D 0
W
100W~
330
KEY
VSS
W
FLAG 2
trigger
out
FLAG OSC2 OSC1
H T 815D 0H T 815D 0
VDDOSC2 OSC1
AUD
VSS
R
OSC
V
DD
SW
8050
AUD
8050
12 March 15, 2000
Power-on play (continuous)
With volume adjustment
KEY
R
OSC
100W~
330
W
FLAG 1
H T 815D 0
100W~
330
HT815D0
V
DD
SW
W
FLAG 2 V D DOSC2 OSC1
AUD
VSS
8050
V
DD
SW
KEY1
R
OSC
100W~
330
W
FLAG 1
H T 815D 0
100W~
330
W
FLAG 2
VDDOSC2 OSC1
AUD
1k
10mF
8050
W
KEY12
VSS
13 March 15, 2000
HT815D0
Push-pull output
To prevent the speaker and driver transistor from damage due to excess power dissipation which re
sults from a high voltage power supply (4.5V~5.5V), the following push-pull output stage is recom
mended.
V
DD
SW
100W~
100W~
330
W
330
FLAG 1
W
W
FLAG 2 V D DOSC2 OSC1
KEY12
100W~
330
1N 4148
8050
47mF
8550
430
W
V
DD
AUD
VSS
W
KEY1
Coupling to power amplifier
R
OSC
R
OSC
H T 815D 0
100W~
330
-
-
KEY1
FLAG 1
H T 815D 0
KEY12
FLAG 2 VD DOSC2 OSC1
AUD
VSS
0.1mF
560
W
10k
W
To
pow er
am p
14 March 15, 2000
HT815D0
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 ã 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. Theapplications mentionedherein 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.
15 March 15, 2000
-
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