Datasheet HT814D0 Datasheet (Holtek Semiconductor Inc)

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Page 1

8.4-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)

8.4-second voice capacity (based on a 6kHz

sampling rate) 12 keys

Controllable volume

FLAG1 options

End-pulse output

3HzB flash

6HzB flash

Voice output indication

Busy output

HT814D0

FLAG2 options

3Hz flash

6Hz flash

Busy output

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 approximate 6kHz)

One shot (for all KEYs)

Level-trigger

Pull-high resistance (for all KEYs)

Section options

Retriggerable

Non-retriggerable

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

Applications

Leisure products

Alarm clocks

Public address system

General Description

The HT814D0 is a single chip LOG-PCM voice synthesizer LSI with 8.4-second voice capacity at a 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 HT814D0 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 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 HT814D0 is excellent for versatile voice applications.

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Page 2

Block Diagram

HT814D0

KEY1

KEY12

OSC1

OSC2

AUD

D ebounce

Circuit

O s c illa to r

Circuit

DAC & Output C ontrol

Pin Assignment

KEY7

KEY8

KEY9

VDD

AUD

OSC2

H T 8 1 4 D 0

20 D IP/SO P

KEY10

KEY11

KEY12

Speech R OM

O ne-shot

Tim e Base

G enerator

48K

6 -b it

KEY6

KEY5

KEY4

KEY3

KEY2

KEY1

FLAG 2

VSS

FLAG 1

OSC1

Key Table

Table R O M 508 ´ 14-bit

ROM Address Counter

KEY7

KEY8

KEY9

KEY10

KEY11

KEY12

VDD

AUD

OSC2

OSC1

FLAG 1

S ta tu s D isplay C ontroller

H T 8 1 4 D 0

24 D IP/SO P

VDD

VSS

FLAG 1

FLAG 2

KEY6

KEY5

KEY4

KEY3

KEY2

KEY1

FLAG 2

VSS

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Page 3

Pad Assignment

KEY9

KEY8

KEY7

KEY6

HT814D0

KEY5

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

Pad Coordinates

KEY10

KEY11

KEY12

VDD

18 19

5 6

AUD

Chip size: 2270 ´ 2450 (mm)

OSC2

(0 ,0 )

15 16

FLAG 1

OSC1

KEY4

KEY3

KEY2

KEY1

FLAG 2

VSS

Unit: mm

Pad No. X Y Pad No. X Y

1 2 3 4 5 6

-914.500

-987.900 -1048.550

-254.600 -1022.050

-18.900 -1022.050

7 411.900 8 674.700 9 806.100

10 937.900

1023.050 11 912.800 526.250

879.650 12 912.800 664.850

689.050 13 912.800 860.250 14 912.800 1003.850 15 709.500 974.350 16 179.200 974.350

-1022.050

-1052.650

17 22.000 974.350 18 19

-156.400

-734.200

974.350

-1022.050

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Page 4

Pad Description

HT814D0

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

Description

Trigger key, active low. Key features such as debounce time, pull-high resistance and repeat (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 option). Open drain, active low output.

Trigger key, active low. Key features such as debounce time, pull-high resistance and repeat (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

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

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

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HT814D0

Electrical Characteristics

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

¾¾

Functional Description

The HT814D0 is a mask ROM type voice synthe sizer with 8.4-second voice capacity. A group of pre-recorded voice sections is played upon receipt of key trigger input signals. Two FLAG outputs send signals are while playing voices.

The 8.4-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, as well as 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 di rect keys exclusively.

Conditions

Min. Typ. Max. Unit

2.4

¾¾

=0.6V

=0.3V

-1.5 -2 ¾

1.5 3.0

0.8V

=530kW

OSC

Play function block diagram

Key

trigger

Key

features

option

Play control logic

200 400

76 96 116 kHz

Key

function

table ROM

Voice ROM

5.0 V

0.2V

System oscillator

The HT814D0 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 process

of voice programming. As a result, the values of the oscillator resistor may be different for different items.

D/A

Flag

output

Ta=25°C

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HT814D0

OSC1

H T 814D 0

OSC2

OSC

The oscillator is turned on when triggered by a key input. After playing, it is turned off and the chip goes into the standby state.

Voice ROM

The voice ROM is originally designed to continu ously record the 8.4-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.

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 se c.2 sec.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 op tion.

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

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HT814D0

Group

The HT814D0 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 dif ferent groups. However, KEY1 can be made up of multiple groups when it is optioned as a se quential or random key. Otherwise, each key is composed of one group only.

Key function table

The sections in the voice ROM are played ac cording to the instructions of the key function table. The function table contains group infor mation and the playing order of sections con tained 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.

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, 11 sec tions for the function table. If KEY1 is mo

mentarily triggered, section 1, section 2, section 3 and section 5 are played in sequence and then stops. Triggering KEY2 plays sec

tion 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.

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HT814D0

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 .....

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 is playing and one of KEY2~KEY12 is triggered, the playing sub-group will be terminated, and the newly triggered key group is played instead. 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.

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 speci

fied by the pulse number applied to KEY1

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.

KEY1

KEY2~KEY12

AUD

KEY1

KEY2~KEY12

(Silence)

AUD

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

Reset of KEY1 playing sequence

N pulse

G roup 1-N

KEY1 sub-group selection

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G roup (2~12)

M pulse

G roup 1-1

G roup 1-M

Page 9

HT814D0

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 to

be selected by mask option, namely, 700ms, 22ms, 45ms and 180ms. 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, 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 level hold function can be

optioned as one-shot trigger mode, or level hold mode, or level-trigger mode.

One shot

When one of the 12 keys (KEY1~KEY12) is pressed and held down or pressed momentarily, 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.

KEY N

AUD

Level hold

G roup N

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 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.

AUD

FLAG

: F loating

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HT814D0

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

FLAG

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 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.

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 a floating output when the chip is in the standby state.

The 8050 type transistor with h

ommended for an output driver.

OSC1

VDD

OSC

OSC2

AUD

VSS

8050

HT814D0

@150 is rec-

SPK

: F loating

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Page 11

Application Circuits

General application

HT814D0

SPK

KEY10

KEY11

KEY12

KEY9

KEY8

KEY7

KEY6

KEY5

KEY4

KEY3

KEY2

KEY1

15 16 17 18 19

H T 814D 0

VDD

8050

5 6

AUD

OSC2

OSC

OSC1

FLAG 1

FLAG 2

VSS

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

OSC

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 T814D 0

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Page 12

Parallel application

100W~

330

FLAG1 VDD OSC2 OSC1

FLAG 2

VSS KEY1

Cascade or external driving

H T 814D 0

OSC

AUD

KEY12

100W~

330

FLAG 1

FLAG 2

VDD OSC2 O SC 1

H T 814D 0

VSS KEY1 KEY12

HT814D0

OSC

AUD

8050

OSC

OSC2 OSC1

VSS

KEY1

Power-on play (one shot)

0.1mF

KEY

OSC

1.2M

FLAG 1

AUD

KEY12

100W~ 330

H T 814D 0

FLAG 1

100W~ 330

KEY

trigger out

FLAG 1

H T 814D 0H T 814D 0

OSC

OSC2 OSC1

AUD

8050

VSS

FLAG 2 VD DOSC2 OSC1

AUD

VSS

8050

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Page 13

Power-on play (continuous)

With volume adjustment

KEY

OSC

100W~ 330

FLAG 1

H T 814D 0

100W~ 330

FLAG 2

VDDOSC2 OSC1

AUD

VSS

8050

HT814D0

KEY1

OSC

100W~ 330

FLAG 1

H T 814D 0

100W~ 330

FLAG 2 VD DOSC2 OSC1

AUD

KEY12

VSS

8050

10mF

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Page 14

HT814D0

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

Coupling to power amplifier

KEY1

OSC

330

H T 814D 0

KEY1

OSC

100W~ 330

FLAG 1

H T 814D 0

100W~ 330

FLAG 2

VDDOSC2 OSC1

0.1mF

AUD

KEY12

VSS

560

pow er

10k

am p

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Page 15

HT814D0

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 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.

15 March 15, 2000