Holtek Semiconductor Inc HT813D0 Datasheet
5.6 Second LOG-PCM Speech
Features
•
Operating voltage: 2.4V ~5.0V
•
Directly drives an external transistor
•
Low standby c urr en t ( 1µ A ty p. for VD D= 3 V)
•
Minimal external components
•
380 words table ROM for key functions
•
Programmable silence length and end-pulse
width (minimal end-pulse width is 330
6kHz sampling rate)
•
5.6-second voice capacity (based o n a 6kHz
sampling rate)
•
Controllable volume
•
FLAG1 options:
–
End-puls e output
–
3HzB flash
–
6HzB flash
–
Voice output indication
–
Busy output
•
FLAG2 options:
–
3Hz flash
–
6Hz flash
–
Busy output
µs at a
HT813D0
•
8 keys
•
Key options:
–
Stop key: KEY8
–
Random (only for KEY1)
–
Sequential (only for KEY1)
–
Repeat (for all KEYs)
–
Key debounce time (for all KEYs): 700µs,
22ms, 45ms, 180ms (based on a 6kHz sampling rate)
–
One shot (for al l KEYs )
–
Level-trigger
–
Pull-high resistance (for all KEYs)
•
Section options:
–
Retriggerable
–
Non-retriggerable
•
Dice form or 16-pin DIP/SOP
Applic a tions
•
Toys
•
Alarm clocks
•
Public address system
General Description
The HT813D0 is a single-chip LOG-P CM voice
synthesizer LSI wi th 5.6-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 HT813D0 provides 8 key inputs and 2 programmable FLAG outputs. With 2.4V~5.0V
power supply, a complete synthesized voice
playback system can be ea sily built with very
few external components.
•
Alert & warning system
•
Sound effect generators
The custome r’s voice s ources are reco rded 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 programmable. With such a
flexible structure, the HT813D0 is excellent for
versatile voice applications.
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Pin Assignment Block Diagram
HT813D0
Pad Coordinates
Pad
No.
1 –887.00 702.20 9 903.50 365.80
2 –887.00 524.50 10 886.90 568.00
3 –1007.00 –804.00 11 886.90 743.00
4 –231.30 –754.00 12 626.90 754.00
5 59.80 –754.00 13 76.80 754.00
6 523.50 –754.00 14 –253.70 754.00
7 831.30 –754.00 15 –627.20 754.00
8 1006.90 –804.00
Chip size: 2290
* The IC substrate should be connected to VSS in the PCB layout artwork.
× 1940 (µm)
2
XY
Pin Description
Pin No. Pin Name I/O
1 OSC1 I — Oscillator input pin
2 FLAG1 O
3 VSS I — Negative power supply (GND)
4 FLAG2 O
Internal
Connection
NMOS
Open Drain
NMOS
Open Drain
Description
3HzB/6HzB flash output, busy output, end-pulse or
voice output indication (by mask option). Open
drain, active low output
3Hz/6Hz flash output or busy output (by mask
option). Open drain, active low output
Pad
No.
Unit: µm
XY
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HT813D0
Pin No. Pin Name I/O
Internal
Connection
Description
Trigger key, active low. Key features such as
5~12 KEY1~ KEY8 I Pull-High
debounce time, pull-high resistance and repeat can
be selected by mask option.
13 NC — — No connection
14 VDD I — Positive power supply
15 AUD O
PMOS
Open Drain
Voice output for driving an external transistor
16 OSC2 O — Oscillator output pin
Absolu te Maxim um Ratings *
Supply Voltage ............................... –0.3V to 6V Storage Temperature ............... –50°C to 125°C
Input Voltage ............... V
–0.3V to VDD+0.3V Operating Temperature ............. –20°C to 70°C
SS
*Note: These are stress ra tings on ly. Stresses exceeding the range spe cified un der “Abso lute 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 condition s may affect device reliability.
Electrical Cha racteristics (Ta=25°C)
Symbol Parameter
V
I
DD
I
STB
I
O
I
OL
V
V
f
OSC
Operating Voltage — — 2.4 — 5.0 V
DD
Operating Current 3V
Standby Current 3V — — 1 3 µA
Max. AUD Output Current 3V VOH=0.6V –1.5 –2 — mA
FLAG Sink Current 3V VOL=0.3V 1.5 3.0 — mA
“H” Input Voltage — — 0.8V
IH
“L” Input Voltage — — 0 — 0.2V
IL
Oscillati ng Frequency 3V R
Test Conditions
V
DD
Conditions
No load,
f
=96kHz
OSC
=530kΩ 76 96 116 kHz
OSC
Min. Typ. Max. Unit
DD
µA
V
—200400
—VDDV
DD
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Functional Description
The HT813D0 is a mask ROM type voice synthesizer with 5 .6-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 5.6-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 arrange ment of sections, as well
as key features and FLAG output are all programmable before device fabrication.
The IC provides 8 key inputs (KEY1~KEY8). Of
the 8 keys, KEY1 can b e optioned as a direct,
sequential or rando m trigger key. KEY8 can be
selected as a stop or a direct key. The remaining
6 keys (KEY2~KEY7), are u sed as direct keys
exclusively.
Play function block diagram
Syste m os c ill ator
The HT813D0 has a built-in RC oscillator which
requires only one external res istor for normal applications. The oscillator frequency is typically
96kHz for an external resistor of 530k
quired oscillator frequency m ay vary with different sampling rates in the process of voice
programming . As a res ult , the v alu e of th e osci llator resistor may be different with respect to different items.
Ω. The re-
HT813D0
The oscillator is turned on when triggered by a
key input. After playing, it is immediately turned
off. Then the chip goes into the standby state.
Voice ROM
The voice ROM is originally designed to continuously record the 5.6-second voice data at about
6kHz sampling rate. A higher sampling rate will
generate 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 ex tended
by making use of coding efficiency, silence playing,
section repeating, section cascade, et c.
Section
Section is the basic element constituting the
contents of the voice ROM. During programming, the custome r’s voice sources can be divided into as many sections as required. A
section can be composed of a voice or an interval
of silence. However, the silent length is not
counted in voice ROM. The total number of
sections included should be less than 380 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.
4 5th May ’98
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