View HT817D0_1542767.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

HT817D0 16.8-second log-pcm speech 1 march 15, 2000 features operating voltage: 3.6v~5.0v directly drives an external transistor low standby current (1 a typ. for v dd =3v) minimal external components 508 words table rom for key functions programmable silence length and end-pulse width (minimal end-pulse width is 330 sata 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 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): 700 s, 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 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 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 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. the customer s voice sources are recorded sec- tion 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. applications leisure products alarm clocks public address system alert and warning system sound effect generators
block diagram pin assignment HT817D0 2 march 15, 2000

! "#$! %&'() #))(! ! '* &+(# (! '()&, - & &"! &. !/! ! ) &, - & & " ! , - & 00 ## ! !(!# #/)(% ! ))
pad assignment chip size: 2270 3630 ( m) 2 * the ic substrate should be connected to vss in the pcb layout artwork. pad coordinates unit: m pad no. x y pad no. x y 1 914.50 1612.75 11 912.80 1115.95 2 914.50 1469.35 12 912.80 1254.55 3 914.50 1278.75 13 912.80 1449.95 4 987.90 1638.25 14 912.80 1593.55 5 254.60 1611.75 15 709.50 1564.05 6 18.90 1611.75 16 179.20 1564.05 7 411.90 1611.75 17 22.00 1564.05 8 674.70 1611.75 18 156.40 1564.05 9 806.10 1642.35 19 734.20 1564.05 10 937.90 1611.75 HT817D0 3 march 15, 2000 1 2 3
pad description pad no. 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 positive power supply 5 aud o pmos open drain voice output for driving an external transistor 6 osc2 o oscillator output pin 7 osc1 i oscillator input pin 8 flag1 o nmos open drain 3hzb/6hzb flash output, busy output, end-pulse or voice output indication (by mask option). open drain, active low output. 9 vss negative power supply, ground 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, active low. 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 storage temperature ............... 50 cto125 c input voltage ............... v ss 0.3v to v dd +0.3v operating temperature ............. 20 cto70 c note: these are stress ratings only. stresses exceeding the range specified under absolute maxi- mum ratings 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. HT817D0 4 march 15, 2000
electrical characteristics symbol parameter test conditions min. typ. max. unit v dd conditions v dd operating voltage 3.6 5.0 v i dd operating current 3v no load 200 400 a i stb standby current 3v 13 a i o max. aud output current 3v v oh =0.6v 1.5 2 ma i ol flag sink current 3v v ol =0.3v 1.5 3.0 ma v ih h input voltage 0.8v dd v dd v v il l input voltage 0 0.2v dd v f osc oscillating frequency 3v r osc =530k 76 96 116 khz HT817D0 5 march 15, 2000 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 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. as for the remaining 10 keys (key2~key11), they are used as direct keys exclusively. play function block diagram 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 530k . 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. % ! 44 % 5(! # /! % 5 ! !( ) ,- ,- 6 7 )(%4&! )&)4 )(4 !/! ,
HT817D0 6 march 15, 2000 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. a higher 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: 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 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 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. #8 #8
#8 #8 #8 #8 #8 ,- ,- ,- 9(* /)&:& &#!&)% 9(* /)& :&&#!&0;# 9(* /)&:&
&#!&0;#
HT817D0 7 march 15, 2000 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. /&" /&" /&"
/&1 < 3 /&" < figure1 reset of key1 playing sequence /&"

&/)# /&"- -&/)# < 1 )3 figure 2 key1 sub-group selection
HT817D0 8 march 15, 2000
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. in other words, the key1 playing sequence is reset whenever a key otherthankey1istriggered(seefigure1).
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 ( 700 s, 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 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 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, 700 s, 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, 20k , 50k , 100k and 200k . 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.
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 sec - tions are all completed. /&
/&
&
/&
/&
/&
&

HT817D0 9 march 15, 2000
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. 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. 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. 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. :&)(!4 :& ) ( ! 4 :&)(!4 /&
/&
/&
&

HT817D0 10 march 15, 2000 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.
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 fe 150 is rec - ommended for an output driver. :&)(!4 :&)(!4 , 7
application circuits general application HT817D0 11 march 15, 2000 , =&'$&> &##! (!&#$)0&&!0&!& &&!$&7 + &)(%!&( !? @8 ,a < 7 ,# , ,# , , 7

parallel application cascade or external driving power-on play (one shot) HT817D0 12 march 15, 2000 < , , < < < , , ! 44 ! , b 8 8 - < <
power-on play (continuous) with volume adjustment HT817D0 13 march 15, 2000 , b < < b @ , < <
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. coupling to power amplifier HT817D0 14 march 15, 2000 b
, < < 8 @ ' /? (* / , < <
HT817D0 15 march 15, 2000 copyright 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 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. 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

▲Up To Search▲

Price & Availability of HT817D0

	To Download HT817D0 Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .