HT812L0
2.8 Second Enhanced Tone Voice
Pin Assignment
Features
•
Operating voltage: 2.4V~5.0V
•
Low standby current (1µA Typ.)
•
Voice/sound effect/simple melody output
•
2.8-second voice capacity
•
32 tone sections
•
16 words for each tone section
•
Current type D/A output
•
Mask option s
–
Pull-high resi stor: 20kΩ/50kΩ/100kΩ
–
KEY1: Direct or sequential/random key
–
Trigger mode: Retriggerable/Non-retriggerable
–
KEY1 play normal mode or twin mode
Normal mode: one group for KEY1
Twin mode: Two groups for KEY1
–
8 direct key or 4×4 MATRIX keys
–
Two-page trigger
–
Key debounce time: 22ms/45ms
–
Trigger function:
Level hold/one shot/level trigger
–
FLAG1, FLAG2 outputs:
3Hz/sound level/busy/6Hz/endp
–
Melody/tone decay time:
2 sec/1 sec/0.5 sec/0.25 sec
–
Four kinds of envelope shapes for melody
•
Tone shape: tone+2kHz/noise/tone/silence
•
Tempo: 16ms/section~1 sec/section
•
Dice form or 16-pin DIP
Applications
•
Toys
•
Alarm clocks
•
Public address system
•
Alert & warning system
•
Sound effect generators
•
Voice interface products
General Description
The HT812L0 is a single chip PCM voice and
sound effect synthesizer . It provides 2.8 seconds
of voice capacity at a 6kHz sampling rate
(F
SR
=6kHz) and 32 sections of sound effects/simple melodies. A maximum of 8 keys or
4
×4 MATRIX are available. Of the 8 keys or 4×4
MATRIX, KEY1 can be optioned as a direct or
sequential/random key, so that it can play an
interlaced voice/sound effect/simple melody and
generate various speci al sound effects for toys
and sound effect generator applications.
1 5th May ’98
Block Diagram
Pad Coordinates
Unit: µm
Pad No. X Y
1 –822.65 828.40
2 –855.15 –900.10
3 26.65 –823.00
4 176.65 –828.00
5 516.25 –827.60
6 666.25 –827.60
7 830.65 –819.30
8 824.55 394.80
9 816.55 828.40
10 654.75 828.40
11 493.55 828.40
12 331.75 828.40
13 –338.55 828.40
14 –497.15 828.40
15 –664.15 828.40
Chip size: 1970
× 2120 (µm)
2
*The IC substrate should be connected to VSS in the PCB layout artwork.
HT812L0
2 5th May ’98
Pad Description
Pad No. Pad Name I/O
Internal
Connection
Description
2 VDD I — Positive power supply
3AUD O
PMOS
Open Drain
Voice/tone output driving an external transistor
4 OSC2 O — Oscillator output pin
5 OSC1 I — Oscillator input pin
6
FLAG1 O
NMOS
Open Drain
3Hz flash/busy output/6Hz (by code o ption), active
low
7 VSS I — Negative power supply (GND)
8 FLAG2 O
NMOS
Open Drain
3Hz flash/busy output/ENDP/sound level display
(by mask option), active low
9~15, 1 KEY1~KEY8 I Pull-High
Trigger key, active low. KEY1 can be optioned as a
direct or sequential/random key, the 7 keys as
direct keys only or by mask option as 4
×4 matrix
key
Absolu te Maxim um Ratings *
Supply Voltage.................................–0.3V to 6V Storage Temperature.................–50°C to 125°C
Input Voltage................. V
SS
–0.3V to VDD+0.3V Operating Temperature...............–20°C to 70°C
*Note: These are stress ra tings on ly. Stresses exceeding the range specifie d under “Ab solute Maxi -
mum Ratings” ma y 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.
Electrical Characteristics (Ta=25°C)
Symbol Parameter
Test Conditions
Min. Typ. Max. Unit
V
DD
Conditions
V
DD
Operating Voltage — — 2.4 — 5.0 V
I
OP
Operating Current 3V
No load,
f
OSC
=96kHz
—200400
µA
I
STB
Standby Current 3V — — 1 3 µA
I
O
Max. AUD Output Current 3V VOH=0.6V –1.5 –2 — mA
I
OL
FLAG Sink Current 3V VOL=0.3V 2 3 — mA
V
IH
“H” Input Voltage — — 0.8V
DD
—VDDV
V
IL
“L” Input Voltage — — 0 — 0.2V
DD
V
f
OSC
Oscillating Frequency 3V — — 96 — kHz
HT812L0
3 5th May ’98
Functional Description
The HT812L0 is a voice and melody synthesizer
LSI with 2.8-second voice capacity at 6kHz
sampling rate and 32 sections of sound effects/simple melodies. The 2.8 seconds of voi ce
capacity can be divided into sections of arbitrary length. Notice that the silence length is
not included in the memo ry. A s for the 32-section tone table, various sound effects can be
generated.
The HT812L0 provides a maximum of 8 keys, 2
status indicator driving pins and a current type
D/A output. Of the 8 keys, only KEY1 can be
optioned as a sequentia l (random) or a direct
key. Th e remaining 7 keys (KEY2~KEY8) are
used as direct keys exclus ively or by mask option as matrix key input (4
×4).
Voice section and group
•
Voice section
The total synthesized voi ce contents (2.8 sec-
onds) can be partitioned into the desired number of sections depending on the si ze of the
ROM table. The length of each section is decided by the requirements of the voice contents. For example:
•
Melody section
The HT812L0 provides 32 melody/tone sec-
tions at maximum . Each secti on is comp osed
of 16 tone codes and e ach code stands for a
period of tone output. The tone frequency en velope shape, envelope length and speed of
tone (tempo) are all programmable. There-
fore, a variety of sound effects and melodies
can be generated.
•
Group
A group can consist of one or mo re sections
and be made up solely of voice or melody or a
combination of b oth sounds. The same voice
and melody sections can appear in different
groups, as shown below:
Group 1 sec.1 + sec.2 + Melody.1 + sec.5
Group 2 sec.3 + Melody.2 + Melody.1
Group 3 sec.2 + sec1
Group 4 sec.2 + Melody.3 + sec.4
:
:
:
:
Group 16 None
The maximum amoun t of groups included in
the HT812L0 is decided by the setting of
KEY1, as described in the following:
♦
KEY1 as a direct key
When KEY1 is selected as a dire ct key, the
maximum amount of groups included in the
HT812L0 is 16. And the sum of the voice and
melody sections o f the 16 groups has to be
less than 256. When one of the 8 keys is
triggered, the sections of the correspo ndi ng
group is played in sequence.
♦
KEY1 as a sequential (or random) key
When KEY1 is set as a sequential (or ran-
dom) key, the maximum amount of grou ps
included in the HT812L0 can be defined by
the user under the conditio n that the total
number of the voice an d melody sections o f
the groups is less than 256 . Of the 8 keys,
only KEY1 can be made up of more than one
group . The remaining 7 keys (KEY2~KEY8)
comprised one group only.
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4 5th May ’98
For example:
Group 1-1 sec.1 + sec.4
Group 1-2 sec.3 + Melody.1
:
:
:
:
Group 1-N sec.2 + sec1 + Melody.1 + sec.1
Group 2 Melody.1 + Melody.3 + sec.1
Group 3 sec.2 + sec.3
:
:
:
:
Group 16 sec.1 + Melody.2 + Melody.3
Each time KEY1 is triggered, the corresponding group is played in sequence. When
the last group is finished th e KEY1 group
sequence will be repeated by successive trigger inputs.
♦
KEY1 as a two-group key (TWIN mode).
KEY1 can play two groups, if KEY 1 is h eld
down, the group 1 can be played repeatedly
till KEY1 is released, and immediately then
the group 2 will be played one cycle by the
rising edge of KEY1. (see Figure 1)
Key operation functions
KEY1~KEY8 all function as trigger keys. By
mask option, the HT 81 2L0 provi des three trigger functions for the 8 keys , namely: “one shot”,
“level hold” and “level trigge r”. All of the three
trigger functions can be optioned as retriggerable or non-retriggerable.
•
Trigger function
♦
One shot
When one of the 8 keys (KEY1~KEY8) is
pressed and held down, or pressed momentarily, the group corresp ond ing to that he ld
or pressed key will play once.
♦
Level hold
When one of the 8 keys is triggered, the
group corresponding to the triggered key
will keep playing till that key is released.
♦
Level trigger
When one of the 8 keys is pressed and held
down, the corresponding group will keep
playing. Once the pressed key is release d,
the group will not stop till the included sections are all completed.
Figure 1 One key two groups function (TWIN mode)
HT812L0
5 5th May ’98
•
Trigger mode
♦
Retriggerable
When a group is playing corresponding to a
momentarily triggered key, any further key
input can terminate the currently playing
group and start playing the group corresponding to the newly triggered key. However, if a group of KEY1~KEY 8 is playing
but the key corresponding to the playing
group is still held down , whether the currently playing group will be forcefully
stopped or not, depends on the key priority,
namely;
KEY1>KEY2> KEY3>KEY4
…>KEY 8.
♦
Non-retriggerable
In the non-retriggerable mod e, when one o f
the 8 keys (KEY1~KEY8) is pressed, the
corresponding group will not start playing
till the currently playing group is completed.
AUD
The AUD pin is a PM OS op en dra in stru cture.
It outputs voice and tone signals to drive a
speaker through an external NPN transistor
when the chip is active. However, the AUD pin
becomes a floatin g output when the ch ip is in
the standby state.
The 8050 type transis tor with h
FE
≅150 is rec-
ommended for an output driver.
System oscillator
The HT812L 0 has an RC oscillator which re quires only one external resistor for normal
applications. The oscillator frequency is typically 96kHz for an external resistor.
The oscillator is turned on when triggered by a
key input. After playing, the oscillator is turned
off and the chip goes into the standby state.
Mask opt ions
The HT812L0 provides the following mask options for different applications. Before manufacture, all of the options must be defined to
enable a proper syste m of op eration.
•
Mask options for keys:
♦
Keys debounce time: 22ms/45ms
♦
Pull-high resistor: 20kΩ/50kΩ/100kΩ
♦
Trigger function: Level hold/One shot/Level
trigger
♦
Direct key or matrix key (4×4)
♦
Normal or two pages (Direct key=16 trigger,
matrix key=32 trigger)
•
FLAG2 outputs: 3Hz/sound level/busy/endp
(Mask option)
♦
3Hz flash
When voices are playing, the FLAG LED
flashes with a 3Hz rate. The LED turned on
duty is 25%.
In the standby s tate, the FLAG pin is a floating
output.
HT812L0
6 5th May ’98
♦
Busy output
When voices are playing, the FLAG pin is
turned low and the FLAG LED is switched
on. Once the voice output is terminated,
FLAG becomes a floating output and the
FLAG LED is switched off.
♦
Sound level display
The brightness o f the LED will vary with
the volume in the voice output state.
Programmable items
•
Voice section
•
Tempo
•
Decay time and envelope shape
There are four programmable envelope
shapes and decay time to smooth out tone and
melody sounds.
♦
Decay time: 2 sec, 1 sec, 0.5 sec, 0.25 sec
♦
Tone shape: tone+2kHz, noise, tone, silence
•
Trigger mode: retriggerable/ non- ret riggerable
•
REPEAT functi on
•
FLAG1 outputs, 3Hz/6Hz/Busy/Off
HT812L0
7 5th May ’98
Application Circuits
Direct key application
HT812L0
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Key Matrix (4×4) application
Standard Item List
Item Name R
OSC
Remorks
HT812LA DJDRUM 436kΩ Matrix key and option page
HT812L0
9 5th May ’98
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