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HT818D0 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 330ms at a 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
*
* * *
*
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
* *
Alert and warning system Sound effect generators
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 programmable 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. The customers 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.
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HT818D0
Block Diagram
KEY1 KEY12 OSC1 OSC2
D ebounce C ir c u it O s c illa to r C ir c u it DAC & O u tp u t C o n tro l
O n e -s h o t
K e y T a b le S ta tu s D is p la y C o n tr o lle r
VDD VSS FLAG 1 FLAG 2
T im e B a s e G e n e ra to r
T a b le R O M 5 0 8 1 4 - b it
AUD
V o ic e R O M 1 2 8 K 6 - b it
R O M A d d re s s C o u n te r
Pin Assignment
KEY7 KEY8 KEY7 1 2 3 4 5 6 7 8 9 10 KEY8 KEY9 KEY10 KEY11 KEY12 NC VDD AUD OSC2 20 19 18 17 16 15 14 13 12 11 KEY6 KEY5 KEY4 KEY3 KEY2 KEY1 FLAG 2 VSS FLAG 1 OSC1 KEY9 KEY10 KEY11 KEY12 NC VDD AUD OSC2 OSC1 FLAG 1 9 10 11 12 8 7 6 5 4 3 2 1 24 23 22 21 20 19 18 17 16 15 14 13 KEY6 KEY5 KEY4 KEY3 KEY2 KEY1 NC NC NC NC FLAG 2 VSS
H T818D 0 2 0 D IP /S O P
H T818D 0 2 4 D IP /S O P
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HT818D0
Pad Assignment
KEY9 KEY8 KEY7 KEY6 KEY5 KEY10 1 2 3 KEY11 KEY12
Pad Coordinates
Pad No.
14 13 12 11 KEY4 KEY3 KEY2 KEY1
Unit: mm Y 1997.95 1854.55 1663.95 -2023.45 -1996.95 -1996.95 -1996.95 -1996.95 -2027.55 -1996.95 1501.15 1639.75 1835.15 1978.75 1949.25 1949.25 1949.25 1949.25 1949.25
X -914.50 -914.50 -914.50 -987.90 -254.60 -18.90 411.90 674.70 806.10 937.90 912.80 912.80 912.80 912.80 709.50 179.20 22.00 -156.40 -734.20
19
18
17
16
15
1 2 3 4 5 6 7 8 9
(0 ,0 )
10 11 12 13 14 15 16 17 18
7 OSC1 8 9 10
4 VDD
5 AUD
6 OSC2
19
Chip size: 2270 4400 (mm)2 * The IC substrate should be connected to VSS in the PCB layout artwork.
FLAG 2 VSS FLAG 1
Pad Description
Pad No. 1~3 4 5 6 7 Pad Name KEY10~KEY12 VDD AUD OSC2 OSC1 I/O I 3/4 O O I Internal Connection Pull-high 3/4 PMOS Open Drain 3/4 3/4 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
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Pad No. 8 9 10 11~19 Pad Name FLAG1 VSS FLAG2 KEY1~KEY9 I/O O 3/4 O I Internal Connection NMOS Open Drain 3/4 NMOS Open Drain Pull-high 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 debounce time, pull-high resistance and repeat are all by mask option.
Absolute Maximum Ratings
Supply Voltage ................................-0.3V to 6V Input Voltage .................VSS-0.3V to VDD+0.3V Storage Temperature ................-50C to 125C Operating Temperature .............-20C to 70C
Note: These are stress ratings only. Stresses exceeding the range specified under Absolute Maximum Ratings 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.
Electrical Characteristics
Symbol VDD IDD ISTB IO IOL VIH VIL fOSC Parameter Operating Voltage Operating Current Standby Current Max. AUD Output Current FLAG Sink Current H Input Voltage L Input Voltage Oscillating Frequency Test Conditions VDD 3/4 3V 3V 3V 3V 3/4 3/4 3V Conditions 3/4 No load 3/4 VOH=0.6V VOL=0.3V 3/4 3/4 ROSC=530kW Min. 3.6 3/4 3/4 -1.5 1.5 0.8VDD 0 76 Typ. 3/4 200 1 -2 3.0 3/4 3/4 96 Max. 5.0 400 3 3/4 3/4 VDD 0.2VDD 116
Ta=25C Unit V mA mA mA mA V V kHz
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HT818D0
Functional Description
The HT818D0 is a mask ROM type voice synthesizer 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 included in the memory. By using Holteks 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 remaining 10 keys (KEY2~KEY11) are used as direct keys exclusively. Play function block diagram
V K fu n ta R ey c tio n b le OM
DD
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 continuously record the 22.4-second voice data at a 6kHz sampling rate. A higher sampling rate can generate voices of better playback quality, but will shorten the total recording time. On the other hand, a lower sampling rate results in longer recording time but sacrifice voice quality. The playback time can be significantly extended by making use of coding efficiency, silence playing, section repeating, section cascade, etc. Section Section is the basic element constituting the contents of voice ROM. During programming, the customers 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:
E x a m p le 1 : O n e s e c tio n o n ly s e c .1 ROM E x a m p le 2 : 3 s e c tio n d iv is io n s e c .1 s e c .2 ROM E x a m p le 3 : N s e c .1 s e c tio n d iv is io n s e c .2 ROM s e c .N s e c .3
Key tr ig g e r
Key fe a tu re s o p tio n
V o ic e ROM
D /A
P la y in g c o n tr o l lo g ic
F la g o u tp u t
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 process of voice programming. As a result, the value of the oscillator resistor may be different for different items.
OSC1
HT818D 0
OSC2
R
OSC
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In addition, a section can be set as retriggerable or non-retriggerable depending on the code option.
* Retriggerable
The following is an example of the function table: Group 1 Group 2 Group 3 Group 4 sec.1 + sec.2 + sec.3 + sec.5 sec.3 sec.2 + sec.2 + sec.3 + sec.4 sec.5 + sec.3
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 p l a y i ng . O n the ot her ha n d , i f 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 corresponding 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 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.
* KEY1 as a direct key
As illustrated in the above table, the voice ROM is composed of 5 sections and the function table of 11 sections. If KEY1 is momentarily 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 random 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 2 Group 3 Group 4 : : sec.2 + sec.3 sec.3 + sec.5 sec.1 + sec.5 + sec.2
Group 1-N sec.2 + sec.3
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 (R) Group 1-2 (R) Group 1-3 ..... (R) Group 1-N (the last group) (R)Group 1-1 ..... The playing sequence of random KEY1 is: Group 1-3 (R) Group 1-5 ..... (R) Group 1-N (R) Group 1-3 (R) Group 1-5 .....
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.
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That KEY1 functions as a random key is a special case of sequential key, which combines a particular arrangement of sub-group playing sequence.
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 specified by the pulse number applied to KEY1 (see Figure 2).
* KEY12 as a stop key (by mask option)
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 instead. The first sub-group will start playing when KEY1 is retriggered. 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 desired sub-group can be selected by controlling its corresponding pulse number. However, the features of KEY1 have to be set in the following ways:
-
When KEY12 functions as a stop key, any voice output can be stopped by pressing KEY12.
* KEY1~KEY11 as a repeat key
sequential or random retriggerable minimum key debounce time (@700ms, fOSC=96kHz)
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 G ro u p 1 -1 G ro u p 1 -2 G ro u p 1 -N G ro u p (2 ~ 1 2 ) G ro u p 1 -1
Figure1 Reset of KEY1 playing sequence
KEY1 KEY2~KEY12 ( S ile n c e ) AUD G ro u p 1 -N G ro u p 1 -M N p u ls e M p u ls e
Figure 2 KEY1 sub-group selection
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Key features
* Key priority * Level hold
When two or more keys are triggered simultaneously, the output voice is determined by the key priority as shown below: KEY1>KEY2>......KEY11>KEY12
* Key debounce time
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 released, then the group will immediately stop regardless of the rest.
KEY N AUD G ro u p N G ro u p N G ro u p N
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
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 indicator, 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
Four kinds of key input pin pull-high resistance can be selected by mask option, namely, 20kW, 50kW, 100kW and 200kW. The resistance may vary with VDD, temperatures 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 G ro u p N G ro u p N
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
Level trigger 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 sections are all completed.
KEY N AUD G ro u p N G ro u p N G ro u p N
FLAG
: F lo a tin g
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* 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 becomes 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
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 customers requirements. The FLAG1 as well as FLAG2 pins are both floating outputs when the chip is in the standby state.
AUD
FLAG : F lo a tin g
FLAG : F lo a tin g
* Busy output
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 options, namely, full range and half range. AUD
: F lo a tin g
When a voice group is playing, the outputs of both FLAG1 and FLAG2 are turned low, indicating that the chip is busy.
AUD
FLAG
In addition to the above-stated output signals, FLAG1 can also generate one of the following signals by code option:
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 hFE@150 is recommended for an output driver.
V OSC1 R
OSC DD
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
VDD SPK
OSC2
AUD VSS
8050
HT818D 0
FLAG
: F lo a tin g
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HT818D0
Application Circuits
General application
KEY9 KEY8 KEY7 KEY6 KEY5
KEY10
1 2
KEY11 KEY12
14 19 3 18 17 16 1513 12 11
KEY4 KEY3 KEY2 KEY1
HT818D0
V
DD
SPK 8W
VDD
4
5
6 7
8 9
10
FLAG 1
FLAG 2
OSC2
OSC1
VSS
AUD
8050 R R
R osc
* T h e IC
s u b s tr a te s h o u ld b e c o n n e c te d to V S S in th e P C B la y o u t a r tw o r k .
V 19 20 21 22 23 24 1 2 3 4 5 6 11 KEY1 KEY2 KEY3 KEY4 KEY5 KEY6 KEY7 KEY8 KEY9 KEY10 KEY11 KEY12 OSC1 VDD FLAG 1 FLAG 2 AUD NC NC NC NC NC VSS OSC2 7 15 16 17 18 13 10 8 12 14 9 8050 R R SPK 8W
DD
HT818D0
R osc
R =100W ~330W
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Parallel application
V
DD
100W ~ 330W
100W ~ 330W R
OSC
100W ~ 330W
100W ~ 330W R
OSC
FLAG 1
FLAG 2 VD D
OSC2
OSC1 AUD KEY12
FLAG 1
FLAG 2 VD D
OSC2
OSC1 AUD KEY12 8050
HT818D0
VSS KEY1
HT818D0
VSS KEY1
Cascade or external driving
V R tr ig g e r out R
OSC DD
OSC
OSC2
OSC1
FLAG 1 AUD KEY12
KEY
FLAG 1
OSC2
OSC1 AUD 8050
HT818D 0
VSS KEY1
HT818D 0
VSS
Power-on play (one shot)
V
DD
SW
R
OSC
100W ~ 330W
100W ~ 330W
OSC2
OSC1
FLAG 1
FLAG 2
VDD AUD VSS 8050
HT818D0
KEY 0 .1 m F 1 .2 M W
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Power-on play (continuous)
V
DD
SW 100W ~ 330W 100W ~ 330W
R
OSC
OSC2
OSC1
FLAG 1
FLAG 2
VDD AUD VSS 8050
HT818D0
KEY
With volume adjustment
V
DD
SW 100W ~ 330W 100W ~ 330W
R
OSC
OSC2
OSC1
FLAG 1
FLAG 2
VDD AUD VSS 1kW 10mF 8050
HT818D0
KEY1 KEY12
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Push-pull output To prevent the speaker and driver transistor from damage due to excess power dissipation which results from a high voltage power supply (4.5V~5.5V), the following push-pull output stage is recommended.
V
DD
SW 100W ~ 330W 100W ~ 330W
R
OSC
OSC2
OSC1
FLAG 1
FLAG 2
VDD AUD VSS 8050 47mF 1N4148
HT818D0
KEY1 KEY12
8550
430W
Coupling to power amplifier
V 100W ~ 330W 100W ~ 330W
DD
R
OSC
OSC2
OSC1
FLAG 1
FLAG 2
VDD AUD VSS
0 .1 m F
HT818D0
KEY1 KEY12
560W 10kW
To power am p
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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 Copyright O 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 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 present 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.
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