Datasheet HT818D0 Datasheet (Holtek Semiconductor Inc)

Download

Page 1

22.4-Second LOG-PCM Speech

Features

Operating voltage: 3.6V~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)

22.4-second voice capacity (based on a 6kHz

sampling rate) Section options

Retriggerable

Non-retriggerable

FLAG1 options

End-pulse output

3HzB flash

6HzB flash

Voice output indication

Busy output

HT818D0

FLAG2 options

3Hz flash

6Hz flash

Busy output

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 6kHz sampling rate)

One shot (for all KEYs)

Level-trigger

Pull-high resistance (for all KEYs)

Dice form or 20/24-pin DIP/SOP package

Applications

Leisure products

Alarm clocks

Public address system

General Description

The HT818D0 is a single chip LOG-PCM voice synthesizer LSI with 22.4-second voice capacity at a 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 HT818D0 provides 12 key inputs and 2 pro grammable FLAG outputs. With a 3.6V~5.0V power supply, a complete synthesized voice playback system can be easily built with very few external components.

Alert and 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 HT818D0 is excellent for versatile voice applications.

1 March 15, 2000

Page 2

Block Diagram

HT818D0

KEY1

KEY12

OSC1

OSC2

AUD

Pin Assignment

KEY7

KEY8

KEY9

KEY10

KEY11

KEY12

VDD

AUD

OSC2

H T818D 0

20 DIP/SO P

KEY6

KEY5

KEY4

KEY3

KEY2

KEY1

FLAG 2

VSS

FLAG 1

OSC1

D ebounce

Circuit

O scillator

Circuit

DAC & O utput

C ontrol

One-shot

Tim e Base

G enerator

Voice R O M

128K ´ 6 -b it

KEY7

KEY8

KEY9

KEY10

KEY11

KEY12

VDD

AUD

OSC2

OSC1

FLAG 1

Key Table

Table R O M 508

R O M Address

C ounter

H T 8 1 8 D 0

24 DIP/SO P

14-bit

KEY6

KEY5

KEY4

KEY3

KEY2

KEY1

FLAG 2

VSS

Status

Display

C ontroller

VDD

VSS

FLAG 1

FLAG 2

2 March 15, 2000

Page 3

HT818D0

Pad Assignment Pad Coordinates

KEY10

KEY11

KEY12

KEY9

VDD

5156

AUD

KEY8

KEY7

KEY6

KEY5

Pad No. X Y

16717818

KEY4

KEY3

KEY2

KEY1

-914.50

-987.90 -2023.45

-254.60 -1996.95

-18.90 -1996.95

7 411.90

8 674.70

9 806.10

(0 ,0 )

10 937.90

11 912.80 1501.15

12 912.80 1639.75

13 912.80 1835.15

14 912.80 1978.75

15 709.50 1949.25

16 179.20 1949.25

17 22.00 1949.25

OSC2

OSC1

FLAG 1

VSS

FLAG 2

-156.40

-734.20

Unit: mm

1997.95

1854.55

1663.95

-1996.95

-2027.55

-1996.95

1949.25

Chip size: 2270 ´ 4400 (mm)

* The IC substrate should be connected to VSS in the PCB layout artwork.

Pad Description

Pad No. Pad Name I/O

1~3 KEY10~KEY12 I Pull-high

4 VDD

5 AUD O

6 OSC2 O

7 OSC1 I

Internal

Connection

¾¾

PMOS

Open Drain

3 March 15, 2000

Description

Trigger key, low active. 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

Page 4

HT818D0

Pad No. Pad Name I/O

8 FLAG1 O

9 VSS

10 FLAG2 O

Internal

Connection

NMOS

Open Drain

¾¾

NMOS

Open Drain

Description

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 option). Open drain, active low output.

Trigger key, low active. Key features such as

11~19 KEY1~KEY9 I Pull-high

debounce time, pull-high resistance and repeat are all by mask option.

Absolute Maximum Ratings

Supply Voltage ................................-0.3V to 6V

Input Voltage .................V

-0.3V to VDD+0.3V

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.

Electrical Characteristics

Storage Temperature ................-50°Cto125°C

Operating Temperature .............-20°Cto70°C

Ta=25°C

Symbol Parameter

STB

OSC

Operating Voltage

Operating Current 3V No load

Standby Current 3V

Max. AUD Output Current 3V

FLAG Sink Current 3V

²H² Input Voltage ¾¾

²L² Input Voltage ¾¾

Oscillating Frequency 3V

Test Conditions

Conditions

¾¾

=0.6V

=0.3V

=530kW

OSC

4 March 15, 2000

Min. Typ. Max. Unit

3.6

200 400

5.0 V

-1.5 -2 ¾

1.5 3.0

0.8V

0.2V

76 96 116 kHz

Page 5

Functional Description

The HT818D0 is a mask ROM type voice synthe sizer with 22.4-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 22.4-second voice capacity can be divided into sections of arbitrary length. Notice that the silence length and end-pulse width are not in cluded in the memory.

By using Holtek¢s programming tools, the con tents and arrangement of sections, as well as key features and FLAG output are all program mable before device fabrication.

The IC provides 12 key inputs (KEY1~KEY12). Of the 12 keys, KEY1 can be optioned as a di rect, 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 di rect keys exclusively.

Play function block diagram

Key

trigger

Key

features

option

Playing control logic

System oscillator

The HT818D0 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 required oscillator frequency may vary with different sampling rates in the pro cess of voice programming. As a result, the value of the oscillator resistor may be differ ent for different items.

Key

fu n c tio n

ta b le ROM

OSC1

H T818D 0

OSC2

Voice ROM

OSC

D/A

Flag

output

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 22.4-second voice data at a 6kHz sampling rate. Ahigher sampling rate can gener

ate voices of better playback quality, but will shorten the total recording time. On the other

hand, a lower sampling rate results in longer re

cording 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 voice ROM. During programming, the customer¢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 silence length is not counted in the voice ROM. The total number of sections 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 sec.3

Exam ple 3: N section division

sec.2 sec.Nsec.1

ROM

HT818D0

5 March 15, 2000

Page 6

HT818D0

In addition, a section can be set as retriggerable or non-retriggerable depending on the code op tion.

Retriggerable When the currently playing section is set as

retriggerable, it will be stopped 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 input to interrupt its playing. On the other hand, if a non-retriggerable section is playing, any key interrupt is ignored.

Group

The HT818D0 plays according to the basis of 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 included in the voice ROM are played according to the instructions of the key function table. The function table contains group information and the playing order of sec tions in the groups. Notice that the total num ber of sections included in the groups should be less than 508 the space limitation of the func tion table 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 ta

ble:

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 func tion table of 11 sections. If KEY1 is momen

tarily triggered, section 1, section 2, section 3 and section 5 are played in sequence and then stops. Triggering 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.

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

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. Each time KEY1 is triggered, the corresponding sub-groups are played in sequence.

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 .....

6 March 15, 2000

Page 7

HT818D0

That KEY1 functions as a random key is a special case of sequential key, which com bines a particular 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 when KEY1 is retriggered. In other words, the KEY1 playing sequence is reset when ever 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 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 speci

fied 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 key 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 or 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.

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) G roup 1-1

Figure1 Reset of KEY1 playing sequence

N pulse

G roup 1-N

M pulse

G roup 1-M

Figure 2 KEY1 sub-group selection

7 March 15, 2000

Page 8

HT818D0

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 system 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 hold mode or level-trigger 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

Level trigger

G roup N

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.

Level hold

When one of the 12 keys is pressed and held

down, the group corresponding to that held key will play until the pressed key is re leased, then the group will immediately stop regardless of the rest.

KEY N

AUD

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 indica tor, 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 pin outputs 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 outputs. When the FLAG1 and the FLAG2 pins are optioned as 3HzB and 3Hz outputs, they will be alternately output at a 3Hz rate.

AUD

FLAG

: F loating

KEY N

AUD

G roup N

8 March 15, 2000

Page 9

HT818D0

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, indi cating that the chip is busy.

AUD

FLAG

: F loating

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

Voice indicator output

FLAG1 is active low when voices are playing. 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

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.

AUD

FLAG

: F loating

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. The AUD pin becomes a floating output when the chip is in the standby state.

The 8050 type transistor with h

ommended for an output driver.

OSC1

OSC

OSC2

VDD

AUD

VSS

8050

H T818D 0

@150 is rec-

SPK

FLAG

: F loating

9 March 15, 2000

Page 10

Application Circuits

General application

HT818D0

SPK

KEY10

KEY11

KEY12

KEY9

KEY8

KEY7

KEY6

KEY5

KEY4

KEY3

1718

KEY2

KEY1

H T 818D 0

8050

VDD

OSC2

AUD

Rosc

8910

FLAG 1

OSC1

FLAG 2

VSS

* The IC substrate should be connected to V S S in the PC B layout artw ork.

Rosc

VDD

FLAG 1

FLAG 2

AUD

VSS

OSC2

R=100W~330

8050

SPK

KEY1

KEY2

KEY3

KEY4

KEY5

KEY6

KEY7

KEY8

KEY9

KEY10

KEY11

KEY12

OSC1

H T 818D 0

10 March 15, 2000

Page 11

Parallel application

100W~

330

FLAG 1

FLAG 2

H T 818D 0

VSS KEY1 KEY12

Cascade or external driving

OSC

VDD O SC2 O SC1

AUD

100W~ 330

FLAG 1

VSS

100W~ 330

FLAG 2

VDD OSC 2 O SC 1

H T 818D 0

KEY1

OSC

KEY12

AUD

8050

HT818D0

OSC

OSC2 OSC1

VSS

KEY1

Power-on play (one shot)

0.1mF

KEY

FLAG 1

KEY12

OSC

AUD

1.2M

100W~ 330

100W~

330

FLAG 1

H T 818D 0

KEY

VSS

FLAG 2 V D DOSC2 OSC1

FLAG 1

H T818D 0H T818D 0

AUD

VSS

trigger out

OSC2

OSC

OSC1

AUD

8050

11 March 15, 2000

Page 12

Power-on play (continuous)

KEY

With volume adjustment

HT818D0

100W~

330

FLAG 1

100W~ 330

FLAG 2

VDDOSC2 OSC1

AUD

VSS

8050

OSC

H T 818D 0

100W~ 330

OSC

KEY1

FLAG 1

H T 818D 0

KEY12

FLAG 2 VD DOSC2 OSC1

AUD

8050

10mF

VSS

12 March 15, 2000

Page 13

HT818D0

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.

100W~

330

FLAG 1

KEY12

FLAG 2

VDDOSC2 OSC1

AUD

VSS

1N 4148

8050

8550

430

47mF

KEY1

Coupling to power amplifier

OSC

330

H T 818D 0

KEY1

OSC

100W~ 330

FLAG 1

H T 818D 0

100W~ 330

FLAG 2

VDDOSC2 OSC1

0.1mF

AUD

KEY12

VSS

560

10k

To pow er am p

13 March 15, 2000

Page 14

HT818D0

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

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. The applicationsmentioned 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.

14 March 15, 2000