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 · · Alert and warning system Sound effect generators · · · · 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 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. 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. 1 March 15, 2000 HT818D0 Block Diagram K E Y 1 K E Y 1 2 O S C 1 O S C 2 A U D D e b o u n c e C ir c u it O n e -s h o t K e y T a b le O s c illa to r C ir c u it 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 D A C & O u tp u t C o n tro l 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 V D D V S S S ta tu s D is p la y C o n tr o lle r F L A G 1 F L A G 2 Pin Assignment K E Y 7 1 2 4 K E Y 6 K E Y 8 2 2 3 K E Y 5 K E Y 7 1 2 0 K E Y 6 K E Y 9 3 2 2 K E Y 4 K E Y 8 2 1 9 K E Y 5 K E Y 1 0 4 2 1 K E Y 3 K E Y 9 3 1 8 K E Y 4 K E Y 1 1 5 2 0 K E Y 2 K E Y 1 0 4 1 7 K E Y 3 K E Y 1 2 6 1 9 K E Y 1 K E Y 1 1 5 1 6 K E Y 2 N C 7 1 8 N C K E Y 1 2 6 1 5 K E Y 1 V D D 8 1 7 N C N C 7 1 4 F L A G 2 A U D 9 1 6 N C V D D 8 1 3 V S S O S C 2 1 0 1 5 N C A U D 9 1 2 F L A G 1 O S C 1 1 1 1 4 F L A G 2 O S C 2 1 0 1 1 O S C 1 F L A G 1 1 2 1 3 V S S H T 8 1 8 D 0 2 0 D IP /S O P H T 8 1 8 D 0 2 4 D IP /S O P 2 March 15, 2000 HT818D0 Pad Assignment K E Y 5 K E Y 1 2 K E Y 6 2 K E Y 7 K E Y 1 1 K E Y 8 1 K E Y 9 K E Y 1 0 Pad Coordinates 1 9 1 8 1 7 1 6 1 5 3 1 4 K E Y 4 1 3 K E Y 3 1 2 K E Y 2 1 1 K E Y 1 (0 ,0 ) 7 O S C 1 8 9 1 0 Pad No. X Y 1 -914.50 1997.95 2 -914.50 1854.55 3 -914.50 1663.95 4 -987.90 -2023.45 5 -254.60 -1996.95 6 -18.90 411.90 -1996.95 7 8 674.70 -1996.95 9 806.10 -2027.55 10 11 12 13 14 15 16 17 18 937.90 912.80 912.80 912.80 912.80 709.50 179.20 22.00 -156.40 -1996.95 1501.15 1639.75 1835.15 1978.75 1949.25 1949.25 1949.25 1949.25 19 -734.20 1949.25 -1996.95 F L A G 2 V S S F L A G 1 6 O S C 2 V D D 5 A U D 4 Unit: mm Chip size: 2270 ´ 4400 (mm)2 * The IC substrate should be connected to VSS in the PCB layout artwork. Pad Description Pad Name I/O Internal Connection Description 1~3 KEY10~KEY12 I Pull-high Trigger key, low active. Key features such as debounce time, pull-high resistance and repeat are all by mask option. 4 VDD ¾ ¾ 5 AUD O PMOS Open Drain 6 OSC2 O ¾ Oscillator output pin 7 OSC1 I ¾ Oscillator input pin Pad No. Positive power supply Voice output for driving an external transistor 3 March 15, 2000 HT818D0 Pad No. Pad Name I/O Internal Connection Description 3HzB/6HzB flash output, busy output, end-pulse or voice output indication (by mask option). Open drain, active low output. 8 FLAG1 O NMOS Open Drain 9 VSS ¾ ¾ 10 FLAG2 O NMOS Open Drain 3Hz/6Hz flash output or busy output (by mask option). Open drain, active low output. 11~19 KEY1~KEY9 I Pull-high Trigger key, low active. Key features such as debounce time, pull-high resistance and repeat are all by mask option. Negative power supply, ground Absolute Maximum Ratings Supply Voltage ................................-0.3V to 6V Storage Temperature ................-50°C to 125°C Input Voltage .................VSS-0.3V to VDD+0.3V Operating Temperature .............-20°C to 70°C Note: These are stress ratings only. Stresses exceeding the range specified under ²Absolute Maximum 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. Electrical Characteristics Symbol Parameter Ta=25°C Test Conditions VDD Conditions Min. Typ. Max. Unit VDD Operating Voltage ¾ ¾ 3.6 ¾ 5.0 V IDD Operating Current 3V No load ¾ 200 400 mA ISTB Standby Current 3V ¾ ¾ 1 3 mA IO Max. AUD Output Current 3V VOH=0.6V -1.5 -2 ¾ mA IOL FLAG Sink Current 3V VOL=0.3V 1.5 3.0 ¾ mA VIH ²H² Input Voltage ¾ ¾ 0.8VDD ¾ VDD V VIL ²L² Input Voltage ¾ ¾ 0 ¾ 0.2VDD V fOSC Oscillating Frequency 3V ROSC=530kW 76 96 116 kHz 4 March 15, 2000 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 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. 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. 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. Voice ROM 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 playback time can be significantly extended by making use of coding efficiency, silence playing, section repeating, section cascade, etc. 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. 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. Play function block diagram V K e y tr ig g e r K fu n ta R K e y fe a tu re s o p tio n e y c tio n b le O M V o ic e R O M D D D /A 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. F la g o u tp u t P la y in g c o n tr o l lo g ic System oscillator The following are examples of section division: 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. E x a m p le 1 : O n e s e c tio n o n ly s e c .1 R O M E x a m p le 2 : 3 s e c tio n d iv is io n s e c .1 E x a m p le 3 : N s e c .1 R s e c .3 R O M O S C 1 H T 8 1 8 D 0 s e c .2 s e c tio n d iv is io n s e c .2 s e c .N R O M O S C O S C 2 5 March 15, 2000 HT818D0 The following is an example of the function table: In addition, a section can be set as retriggerable or non-retriggerable depending on the code option. · Retriggerable When the currently playing section is set as retriggerable, it will be stopped immediately upon receipt of other key inputs. · Non-retriggerable 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 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. 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. · 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. 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. 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 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. 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 ..... ¨ · 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. 6 March 15, 2000 HT818D0 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. That KEY1 functions as a random key is a special case of sequential key, which combines a particular arrangement of sub-group playing sequence. ¨ ¨ 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). 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). · KEY12 as a stop key (by mask option) When KEY12 functions as a stop key, any voice output can be stopped by pressing KEY12. 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: - · 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. sequential or random retriggerable minimum key debounce time (@700ms, fOSC=96kHz) 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. K E Y 1 K E Y 2 ~ K E Y 1 2 A U D 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 K E Y 1 K E Y 2 ~ K E Y 1 2 ( S ile n c e ) N p u ls e M p u ls e A U D G ro u p 1 -N G ro u p 1 -M Figure 2 KEY1 sub-group selection 7 March 15, 2000 HT818D0 Key features * 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 released, then the group will immediately stop regardless of the rest. · Key priority When two or more keys are triggered simultaneously, the output voice is determined by the key priority as shown below: KEY1>KEY2>......KEY11>KEY12 K E Y N · 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. A U D G ro u p N When voices are playing, both FLAG1 and FLAG2 pins are activated to output one of the following signals through code option. 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. FLAG1 can be optioned as one of the following signal outputs: None, 3HzB flash, Busy, 6HzB flash, Voice indicator, or End-pulse output · Trigger mode FLAG2, on the other hand, can be set as one of the following signal outputs: All of the 12 keys can be optioned as one-shot trigger mode, level hold mode or level-trigger mode. None, 3Hz flash, 6Hz flash, or Busy output · 3Hz/3HzB flash 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. 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. K E Y N A U D G ro u p N G ro u p N FLAG · Pull-high resistance ¨ G ro u p N G ro u p N A U D ¨ 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. F L A G : F lo a tin g K E Y N A U D G ro u p N G ro u p N G ro u p N 8 March 15, 2000 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 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. 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. A U D A U D F L A G F L A G : F lo a tin g : F lo a tin g Volume control · Busy output 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. When a voice group is playing, the outputs of both FLAG1 and FLAG2 are turned low, indicating that the chip is busy. A U D F L A G 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. : F lo a tin g In addition to the above-stated output signals, FLAG1 can also generate one of the following signals by code option: ¨ The 8050 type transistor with hFE@150 is recommended for an output driver. 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. V O S C 1 R D D V D D S P K O S C O S C 2 A U D 8 0 5 0 V S S H T 8 1 8 D 0 A U D F L A G : F lo a tin g 9 March 15, 2000 HT818D0 Application Circuits General application K E Y 5 K E Y 6 K E Y 7 K E Y 8 K E Y 9 K E Y 1 0 1 K E Y 1 1 K E Y 4 1 4 2 1 9 K E Y 1 2 1 8 1 7 1 6 K E Y 3 1 5 1 3 K E Y 2 1 2 3 K E Y 1 1 1 H T 8 1 8 D 0 V D D 8 1 0 9 V S S F L A G 2 A U D 8 0 5 0 7 O S C 1 6 4 V D D F L A G 1 5 O S C 2 S P K 8 W R o s c R R * 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 1 9 K E Y 1 K E Y 2 K E Y 3 2 0 2 1 2 2 K E Y 4 2 3 2 4 1 2 3 4 5 6 1 1 V D D F L A G 1 F L A G 2 K E Y 5 A U D K E Y 6 N C K E Y 7 N C K E Y 8 N C K E Y 9 N C K E Y 1 0 N C K E Y 1 1 V S S K E Y 1 2 O S C 1 O S C 2 8 1 2 R R S P K 8 W 1 4 9 D D 8 0 5 0 7 1 5 1 6 1 7 1 8 1 3 1 0 H T 8 1 8 D 0 R = 1 0 0 W ~ 3 3 0 W R o s c 10 March 15, 2000 HT818D0 Parallel application V 1 0 0 W ~ 3 3 0 W 1 0 0 W ~ 3 3 0 W F L A G 1 R F L A G 2 V D D O S C 2 1 0 0 W ~ 3 3 0 W F L A G 1 O S C 1 R F L A G 2 V D D A U D H T 8 1 8 D 0 V S S 1 0 0 W ~ 3 3 0 W O S C K E Y 1 O S C O S C 2 O S C 1 V S S 8 0 5 0 A U D H T 8 1 8 D 0 K E Y 1 2 D D K E Y 1 2 K E Y 1 Cascade or external driving V R O S C 2 tr ig g e r o u t O S C O S C 1 F L A G 1 K E Y 1 K E Y 1 2 O S C O S C 2 O S C 1 H T 8 1 8 D 0 A U D F L A G 1 A U D H T 8 1 8 D 0 V S S K E Y R D D 8 0 5 0 V S S Power-on play (one shot) V D D S W R O S C 2 O S C 1 0 0 W ~ 3 3 0 W O S C 1 1 0 0 W ~ 3 3 0 W F L A G 1 F L A G 2 H T 8 1 8 D 0 K E Y 0 .1 m F V D D A U D 8 0 5 0 V S S 1 .2 M W 11 March 15, 2000 HT818D0 Power-on play (continuous) V D D S W R 1 0 0 W ~ 3 3 0 W O S C O S C 2 1 0 0 W ~ 3 3 0 W F L A G 1 O S C 1 F L A G 2 H T 8 1 8 D 0 K E Y V D D A U D 8 0 5 0 V S S With volume adjustment V D D S W R O S C 2 O S C 1 0 0 W ~ 3 3 0 W O S C 1 1 0 0 W ~ 3 3 0 W F L A G 1 F L A G 2 H T 8 1 8 D 0 K E Y 1 K E Y 1 2 V D D A U D 8 0 5 0 V S S 1 k W 1 0 m F 12 March 15, 2000 HT818D0 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 D D S W R O S C 2 O S C 1 0 0 W ~ 3 3 0 W 1 0 0 W ~ 3 3 0 W F L A G 1 O S C 1 F L A G 2 V D D H T 8 1 8 D 0 K E Y 1 V S S K E Y 1 2 1 N 4 1 4 8 A U D 8 0 5 0 8 5 5 0 4 7 m F 4 3 0 W Coupling to power amplifier V R O S C 2 O S C 1 0 0 W ~ 3 3 0 W O S C 1 1 0 0 W ~ 3 3 0 W F L A G 1 F L A G 2 H T 8 1 8 D 0 K E Y 1 D D K E Y 1 2 V D D A U D 0 .1 m F V S S 5 6 0 W 1 0 k W 13 T o p o w e r a m p March 15, 2000 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 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 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. 14 March 15, 2000