Datasheet HT81003, HT81R03 Datasheet (Holtek Semiconductor Inc)

Preliminary

EasyVoice

Features

Operating voltage: 2.4V~3.6V

·

Directly drives an external transistor

·

PWM function directly driver speaker

·

Low standby current (1mA typ. for VDD=3V)

·

Minimal external components

·

240 notes table ROM for key functions

·

Programmable silence length and end-pulse

·

width (minimal end-pulse width is 1.3ms at
8kHz sampling rate)
3-sec voice capacity (based on a 5kHz sam

·

pling rate)
Controllable volume

·

FLAG1 options

·

-

End-pulse output

-

3Hz, 3HzB flash

-

6Hz, 6HzB flash

-

Busy output

-

OFF

HT81003/HT81R03

TM

3-Second Speech

FLAG2 options

·

-

3Hz flash

-

6Hz flash

-

Busy output

-

OFF

2 keys

·

Key options

·

-

Sequential/Directed

-

Repeat (KEY2)

-

-

STOP key (KEY2)

-

Key debounce time: 1.2ms, 22ms, 45ms
(based on a 8kHz sampling rate)

-

One shot/Normal

-

Pull-high resistance: 0, 50kW,
100kW, 200kW

Section options

·

-

Retriggerable

-

Non-retriggerable

Dice form or 16-pin DIP package

·

Applications

Leisure products

·

Alarm clocks

·

Public address system

·

General Description

The HT81003 is a Mask ROM type and
HT81R03 is an OTP type. The HT81003/
HT81R03 is a single-chip voice synthesizer LSI
with 3-second voice capacity at 5kHz sampling
rate. The chip when triggered drives a speaker
through an external transistor with a PWM
output. Negligible current is consumed in the
standby state.

The HT81003/HT81R03 provides 2-key inputs
and 2 programmable FLAG outputs. With

2.4V~5.0V power supply, a complete synthe
sized voice playback system can be easily built
with very few external components.

EasyVoiceTMis a trademark of Holtek Semiconductor Inc.

Alert and warning system

·

Sound effect generators

·

The customer¢s voice sources are recorded 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 HT81003/HT81R03 is ex
cellent for versatile voice applications.

-

1 July 24, 2000

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Block Diagram

Preliminary

HT81003/HT81R03

TG 1

I/O 1

OSCI

VPP

OE

D ebounce

Circuit

O s c illa to r

Circuit

OTP

Circuit

(for H T 81R03 only)

O ne-shot

Tim e Base

G enerator

Audio

C ontroller

ROM Address

C ounter

Data RO M

Status

Display

C ontroller

Selector

Pin Assignment Pad Assignment

NC

16 D IP

16

OE

15

VSS

14

OUT1

13

VDD

12

OUT2

11

VSS

10

I/O 2

9

VDD

OSCI

1

2

NC

VPP

NC

VDD

NC

OSCI

KEY1

I/O 1

1

2

3

4

5

6

7

8

HT81R03

(0 ,0 )

VDD

VSS

I/O 2

OUT1

OUT2

VPP

11

OE

12

10

VSS

9

OUT1

VDD

8

3

KEY1

4

5

I/O 2

I/O 1

Chip size: 1020 ´ 1995 (mm)

7

6

VSS

OUT2

2

* The IC substrate should be connected to VSS

in the PCB layout artwork.

2 July 24, 2000

Preliminary

HT81003/HT81R03

Pad Coordinates

Pad No. X Y Pad No. X Y

1
2
3
4
5
6 174.15

-345.85

-361.00 -385.35

-356.60 -691.45

-254.00 -839.95

-11.10 -838.55

850.70 7 343.85
8 343.85
9 343.85

10 334.25
11 305.30 851.65

-842.65

12 128.18 844.24

Unit: mm

-778.05

-514.85

-251.65

-58.75

Pin Description

Pin No. Pin Name I/O

1,3,5,16 NC

2 VPP

4, 12 VDD

6 OSCI I

7 KEY1 I Pull-high Trigger key 1, active low

8 I/O1 I

9 I/O2 O

10, 14 VSS

11 OUT2 O CMOS PWM output +/NMOS output

13 OUT1 O CMOS

15 OE

Internal

Connection

¾¾

¾¾

¾¾

¾

NMOS

Pull-high

NMOS

Pull-high

¾¾

¾¾

Description

No connection

Positive power supply

Oscillator input pin

Trigger key 2, active low/NMOS output

Pull-high/transistor output/NMOS output

Negative power supply

PWM output -/NMOS output

Absolute Maximum Ratings

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 de
vice 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

3 July 24, 2000

-

-

Preliminary

HT81003/HT81R03

Electrical Characteristics

Symbol Parameter

V

I

I

I

I

I

I

I

V

V

DD

STB

OL1

OH1

OL2

OH2

OL3

Operating Voltage

DD

Operating Current 3V No load (OSC on)

Standby Current 3V

OUT1 (PWM+)
PWM Output Current

I/O2 (TR)
Tr Output Current

I/O1 (FLAG Sink Current) 3V

²H² Input Voltage ¾¾

IH

²L² Input Voltage ¾¾

IL

Test Conditions

V

DD

¾¾

3V

3V

3V

3V

Functional Description

The EasyVoiceTMis voice synthesizer with
3-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 3-sec 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 2 key inputs (KEY1~KEY2),
KEY1 can be optioned as a direct, sequential
trigger key. Key 2 can be selected as a stop or a
direct key.

Conditions

¾¾

V

=0.1V

OL

V

OH

V

OL

V

OH

V

OL

=0.9V

=0.1V

=0.9V

=0.1V

DD

DD

DD

DD

DD

0.8V

Play function block diagram

Key

trigger

Key

features

option

Play control logic

Ta=25°C

Min. Typ. Max. Unit

2.4

¾

¾

1000 1200

13

75 90

36

13

-1 -2 ¾

35

¾

DD

0

Key

fu n c tio n

table
ROM

8/16/32

speaker

¾

W

Voice
ROM

3.6 V

¾

¾

¾

¾

V

DD

0.2V

DD

PW M +

PW M

-

Select

TR

Flag

output

mA

mA

mA

mA

mA

mA

mA

V

DD

speaker

V

V

8

W

4 July 24, 2000

Preliminary

HT81003/HT81R03

System oscillator

The EasyVoice

TM

has a built-in RC oscillator
which requires only one external resistor for nor
mal applications. The oscillator frequency is typi
cally 2MHz for an external resistor of 150kW. The
required oscillator frequency may vary with differ
ent sampling rates in the process of voice pro
gramming. As a result, the value of the oscillator
resistor may be different with respect to different
items.

OSCI

H T 81003/

R

OSC

HT81R03

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 continu
ously record the 3-sec voice data at about 5kHz
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 the voice quality.

The playback time can be significantly extended
by making use of coding efficiency, silence play­ing, section repeating, section cascade, etc.

The following are examples of section division:

Exam ple 1: O ne section only

-

-

Exam ple 2: 3 section division

-

-

Exam ple 3: N section division

sec.1 sec.2 sec.3

sec.2 sec.Nsec.1

sec.1

ROM

ROM

ROM

In addition, a section can be set as retriggerable
or non-retriggerable depending on 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 until

-

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. If it is a non-retriggerable section
playing, any key interrupt is invalid.

Section

Section is the basic element constituting the
contents of the voice ROM. During program­ming, 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 silent length is not
counted in the voice ROM. The total number of
sections included should be less than 256 due to
the space limitation of the function table ROM.
The total length of the included sections is lim
ited 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.

Group

The EasyVoice

TM

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. For example, trig
gering KEY2 plays group 2, and so on. The
same section is allowed to appear in different
groups. However, KEY1 can be made up of mul
tiple groups when it is optioned as a sequential
key. Otherwise, each key is composed by one
group only.

-

Key function table

The voice ROM sections are played according to
the instructions of the key function table. The
function table contains group information and

5 July 24, 2000

-

-

-

Preliminary

HT81003/HT81R03

the playing order of the sections in the groups.
Notice that the total amount of sections in
cluded in the groups should be less than 256
which is the space limitation of the function ta
ble ROM.

·

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.4

Group 2 sec.3

As illustrated in the table, voice ROM is com
posed of 4 sections, and 5 sections for the
function table. If KEY1 is momentarily trig
gered, section 1, section 2, section 3 and sec
tion 4 are played in sequence and then
stopped. Triggering KEY2 plays section 3.

·

KEY1 as a sequential key
When KEY1 is optioned as a sequential key, it

can include multiple groups (sub-groups) in
the function table. However, KEY2 is used as a
direct key exclusively and comprise of only
one group in the function table.
An example is shown below:

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

As indicated in the above table, KEY1 can be
made up of sub-groups. The corresponding
sub-groups is 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 .....

-

¨

Reset of KEY1 playing sequence

If a sub-group of KEY1 group is being played
and KEY2 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, a 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

-

retriggerable

-

minimum key debounce time

(@1.2ms, f

OSC

=2MHz)

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 a selection of KEY1 sub-groups more
easy, KEY2 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).

·

KEY2 as a stop key (by mask option)
When KEY2 functions as a stop key, any voice

output can be stopped by pressing KEY2.

KEY1

KEY2

AUD

G roup 1-1 G roup 1-2 G roup 1-N

Figure 1. Reset of KEY1 playing sequence

6 July 24, 2000

G roup (2~8)

G roup 1-1

KEY1

KEY2

(S ile n c e )

AUD

Preliminary

N pulse

G roup 1-N

Figure 2. KEY1 sub-group selection

HT81003/HT81R03

M pulse

G roup 1-M

·

KEY2 as a repeat key
As a repeat key, the sections included can be

played sequentially and repeatedly until
other key input is triggered.

Key features

·

Key priority
When two keys are triggered simultaneously,

the output voice is determined by the key pri
ority as shown below:

KEY1>KEY2

·

Key debounce time
There are three kinds of key-in debounce time to

be selected by mask option, namely, 1.2ms,
22ms, 45ms. The key debounce time varies with
the value of the system frequency.

·

Pull-high resistance
Four kinds of key input pin pull-high resis-

tance can be selected by mask option,
namely, 0kW, 50kW, 100kW and 200kW. The
resistance may vary with VDD, tempera­tures and the chip itself due to process vari­ations.

·

Trigger mode
The two keys can optioned as one-shot trigger

mode or normal mode.

¨

One shot

When one of the two keys (KEY1, KEY2) is
pressed momentarily or held down, the
group corresponding to that key will play
once.

KEY N

¨

Normal trigger

When one of the two keys is pressed and
held down, the corresponding group will
continue playing. Once the pressed key is
released, the group will not stop until the
included sections are all completed.

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:

OFF, 3HzB flash, Busy, 6HzB flash, 3hz, 6Hz or
End-pulse output

FLAG2, on the other hand, can be set as one of
the following signal outputs:

OFF, 3Hz flash, 6Hz flash, or Busy output

·

3Hz/3HzB flash
When voices are playing, FLAG1 as well as

FLAG2 pin outputs a 3Hz signal to drive a
LED. The signal is active low, 25% duty. Once
the voice output is terminated, the FLAG1
and FLAG2 pins become floating outputs.
When the FLAG1 and the FLAG2 pins are
optioned as 3HzB and 3Hz output, they will
alternately output at a 3Hz rate.

AUD

G roup N

G roup N

7 July 24, 2000

Preliminary

HT81003/HT81R03

AUD

FLAG

: Floating

·

6Hz/6HzB flash
When voices are playing, the FLAG1 pin

outputs a 6Hz signal to drive a 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 alternately out
put at a 6Hz rate.

AUD

FLAG

: F lo a tin g

·

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

AUD

FLAG

: Floating

Volume control

The function of the 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.

-

I/O2

The I/O2 pin is a PWM structure. It outputs
voice signals to drive a speaker through an ex
ternal NPN transistor when the chip is active.
The OUT1 and OUT2 pins are configured as
PWM structure which can drive 8/16/32W
speaker directly.

An 8050 type transistor with h

@150 is recom

FE

mended for an output driver.

OUT1OSCI

R

OSC

OUT2

-

-

-

SPK

FLAG

: Floating

In addition to the above-stated output sig
nals, FLAG1 can also generate one of the fol
lowing signals by code option:

¨

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 as well as FLAG2 pins are both
floating outputs when the chip is in the
standby state.

H T 81003/H T 81R 03

V

DD

SPK

-

-

R

OSC

I/O 2OSCI

H T 81003/H T 81R 03

8 July 24, 2000

Application Circuits

Preliminary

HT81003/HT81R03

OSCI

KEY1

I/O 1

VDD

1

HT81R03

2

3

4

VDD

V

DD

VPP

OE

12

11

VDD

1

V

DD

VPP

OE

200

W

12

11

LED 1 LE D 2

HT81R03

VSS

10

104pF

9

OUT1

VDD

8

7

5

I/O 2

V

OUT2

6

VSS

200

W

DD

VPP

OE

8W/1 6W/3 2

8050

Speaker

Speaker

8

W

W

OSCI

KEY1

I/O 1

2

3

4

5

6

I/O 2

V

DD

VDD

VPP

VSS

10

104pF

9

OUT1

VDD

8

7

OUT2

8050

Speaker

8

W

VSS

200

W

OE

OSCI

KEY1

1

HT81R03

2

3

4

I/O 1

12

11

200

W

LED 2

VSS

10

104pF

9

OUT1

VDD

8

200

7

5

6

I/O 2

VSS

W

OUT2

LED 1

Speaker

8W/1 6W/3 2

LED 2

W

OSCI

KEY1

I/O 1

1

HT81R03

2

3

4

12

11

VSS

10

104pF

9

OUT1

VDD

8

7

5

I/O 2

OUT2

6

VSS

8W/1 6W/3 2

8050

Speaker

Speaker

8

W

W

9 July 24, 2000

Preliminary

V

DD

HT81003/HT81R03

V

DD

OSCI

KEY1

I/O 1

VDD

1

HT81R03

2

3

4

VPP

OE

12

11

VDD

1

VPP

OE

12

11

HT81R03

9

8

7

Tone In

VSS

104pF

OUT1

VDD

OUT2

Speaker

8W/1 6W/3 2

W

VSS

10

104pF

9

OUT1

VDD

8

7

5

6

I/O 2

OUT2

200

LED 1

W

VSS

Speaker

8W/1 6W/3 2

W

OSCI

KEY1

I/O 1

2

3

4

10

5

6

I/O 2

VSS

10 July 24, 2000

Preliminary

HT81003/HT81R03

Holtek Semiconductor Inc. (Headquarters)

No.3 Creation Rd. II, Science-based Industrial Park, Hsinchu, Taiwan, R.O.C.
Tel: [phone]
Fax: [phone]

Holtek Semiconductor Inc. (Taipei Office)

5F, No.576, Sec.7 Chung Hsiao E. Rd., Taipei, Taiwan, R.O.C.
Tel: [phone]
Fax: [phone]
Fax: [phone] (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: [phone]
Fax: [phone]

Copyright Ó 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 arisingfrom the use of the specifications described. The applications mentioned herein 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.

11 July 24, 2000

-