Datasheet HT817D0 Datasheet (Holtek Semiconductor Inc)

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Page 1

16.8-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)

16.8-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

HT817D0

FLAG2 options

3Hz flash

6Hz flash

Busy output

12 keys

Controllable volume

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 of)

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 HT817D0 is a single chip LOG-PCM voice synthesizer LSI with 16.8-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 HT817D0 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 HT817D0 is excellent for versatile voice applications.

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Page 2

Block Diagram

HT817D0

KEY1

KEY12

OSC1

OSC2

AUD

Pin Assignment

KEY7

KEY8

KEY9

KEY10

KEY11

KEY12

VDD

AUD

OSC2

H T 8 1 7 D 0

20 D IP/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 RO M

96K ´ 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 A ddress

C ounter

H T 8 1 7 D 0

24 D IP/SO P

14-bit

KEY6

KEY5

KEY4

KEY3

KEY2

KEY1

FLAG 2

VSS

Status

Display

C ontroller

VDD

VSS

FLAG 1

FLAG 2

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HT817D0

Pad Assignment

KEY10

KEY11

KEY12

KEY9

KEY8

KEY7

KEY6

(0 ,0 )

KEY5

KEY4

KEY3

KEY2

KEY1

VDD

OSC2

AUD

Chip size: 2270 ´ 3630 (mm)

OSC1

VSS

FLAG 1

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

Pad Coordinates

Pad No. X Y Pad No. X Y

1 2 3 4 5 6

-914.50

-987.90 -1638.25

-254.60 -1611.75

-18.90 -1611.75

7 411.90 8 674.70 9 806.10

10 937.90

1612.75 11 912.80 1115.95

1469.35 12 912.80 1254.55

1278.75 13 912.80 1449.95 14 912.80 1593.55 15 709.50 1564.05 16 179.20 1564.05

-1611.75

-1642.35

17 22.00 1564.05 18 19

-156.40

-734.20

-1611.75

3 March 15, 2000

FLAG 2

Unit: mm

1564.05

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Pad Description

HT817D0

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, 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

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 are all 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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Electrical Characteristics

HT817D0

Symbol Parameter

Test Conditions

STB

OSC

Operating Voltage

¾¾

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

Functional Description

The HT817D0 is a mask ROM type voice synthe sizer with 16.8-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 16.8-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. As for the remaining 10 keys (KEY2~KEY11), they are used as direct keys exclusively.

Conditions

Min. Typ. Max. Unit

3.6

¾¾

=0.6V

=0.3V

-1.5 -2 ¾

1.5 3.0

0.8V

=530kW

OSC

Play function block diagram

Key

trigger

76 96 116 kHz

Key

features

option

Playing control logic

Key

fu n c tio n

ta b le ROM

200 400

Voice ROM

0.2V

5.0 V

System oscillator

The HT817D0 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.

D/A

Flag

output

OSC1

HT817D0

OSC2

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OSC

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HT817D0

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 16.8-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 voice ROM. The total number of sections in cluded 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 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

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.

Of 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 it is a non-retriggerable section playing, any key in terrupt is ignored.

Group

The HT817D0 plays groups on 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 comprised by one group only.

Key function table

The sections include in the voice ROM are played according to the instructions of the key function table. The function table contains group information as well as playing order of sections 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.

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HT817D0

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, voice ROM is composed of 5 sections and the function table of 11 sections. If KEY1 is momentarily trig gered, section 1, section 2, section 3 and sec tion 5 are played in sequence and then stopped. Triggering KEY2 plays section 3, and so forth.

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 .....

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.

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

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HT817D0

Reset of KEY1 playing sequence

If a sub-group of KEY1is playing and one of KEY2~KEY12 is triggered, the playing sub-group will be terminated, and the newly triggered key group come into play instead. The first sub-group will start playing by retriggering KEY1. Inother words, theKEY1 playing sequence is reset whenever a key otherthanKEY1 is triggered (see Figure1).

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 input 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 specified 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 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

that can be selected by mask option, namely, 700ms, 22ms, 45ms and 180ms. The key debounce time varies with the value of the sys tem 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.

KEY N

AUD

G roup N

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HT817D0

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.

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 FLAG1 and 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 lo a tin g

AUD

FLAG

: F loating

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HT817D0

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

Voice indicator output

FLAG1 is active low when voices are play ing. FLAG1 is also turned low when a voice section is output. The brightness of FLAG1 varies with the volume. FLAG1 becomes floating after the silence section is output or the voice output is terminated.

AUD

FLAG

: F loating

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.

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 T 817D 0

@150 is rec

SPK

AUD

FLAG

: F loating

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Application Circuits

General application

HT817D0

SPK

KEY10

KEY11

KEY12

KEY9

KEY8

KEY7

KEY6

KEY5

KEY4

KEY3

KEY2

KEY1

H T817D 0

VDD

8050

OSC2

AUD

Rosc

FLAG 1

OSC1

FLAG 2

VSS

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

Rosc

VDD

FLAG 1

FLAG 2

AUD

VSS

OSC2

R=100W~330

SPK

8050

KEY1

KEY2

KEY3

KEY4

KEY5

KEY6

KEY7

KEY8

KEY9

KEY10

KEY11

KEY12

OSC1

H T817D 0

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Page 12

Parallel application

100W~

330

FLAG 1

FLAG 2 FLAG 1

VDD OSC2 O SC1

H T 817D 0

VSS KEY1 KEY12

Cascade or external driving

HT817D0

100W~

330

OSC

330

AUD

FLAG 2

VDD OSC2 O SC1

OSC

H T 817D 0

VSS KEY1 KEY12

AUD

8050

OSC

OSC2 OSC1

VSS KEY1

Power-on play (one shot)

0.1mF

KEY

FLAG 1

KEY12

OSC

1.2M

AUD

100W~ 330

H T 817D 0

FLAG 1

100W~ 330

trigger out

FLAG 1 O SC2 OSC1

KEY

H T 817D 0H T 817D 0

VSS

FLAG 2 V DDOSC2 OSC1

AUD

VSS

8050

OSC

AUD

8050

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Page 13

Power-on play (continuous)

With volume adjustment

KEY

HT817D0

100W~

330

FLAG 1

100W~ 330

FLAG 2

VDDOSC2 OSC1

AUD

VSS

8050

OSC

H T 817D 0

100W~ 330

OSC

KEY1

FLAG 1

H T 817D 0

KEY12

FLAG 2 VD DOSC2 OSC1

AUD

8050

10mF

VSS

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Page 14

HT817D0

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

FLAG 2

KEY12

VDDOSC2 OSC1

AUD

VSS

1N 4148

8050

8550

430

47mF

KEY1

Coupling to power amplifier

OSC

330

H T 817D 0

KEY1

OSC

100W~ 330

FLAG 1

H T 817D 0

100W~ 330

FLAG 2

VDDOSC2 OSC1

VSS

0.1mF

560

pow er

10k

am p

AUD

KEY12

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HT817D0

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