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| 2 12 series of decoders selection table function address no. data vt oscillator trigger package part no. no. type ht12d 8 4 l rc oscillator din active hi 18 dip/20 sop ht12f 12 0 rc oscillator din active hi 18 dip/20 sop notes: data type: l stands for latch type data output. vt can be used as a momentary data output. 1 july 12, 1999 general description the 2 12 decoders are a series of cmos lsis for remote control system applications. they are paired with holtek s2 12 series of encoders (re- fer to the encoder/decoder cross reference ta- ble). for proper operation, a pair of encoder/decoder with the same number of ad- dresses and data format should be chosen. the decoders receive serial addresses and data from a programmed 2 12 series of encoders that are transmitted by a carrier using an rf or an ir transmission medium. they compare the se- rial input data three times continuously with their local addresses. if no error or unmatched codes are found, the input data codes are de - coded and then transferred to the output pins. the vt pin also goes high to indicate a valid transmission. the 2 12 series of decoders are capable of decod- ing informations that consist of n bits of ad- dress and 12 n bits of data. of this series, the ht12d is arranged to provide 8 address bits and 4 data bits, and ht12f is used to decode 12 bits of address information. features operating voltage: 2.4v~12v low power and high noise immunity cmos technology low standby current capable of decoding 12 bits of information pair with holtek s2 12 series of encoders binary address setting received codes are checked 3 times address/data number combination ht12d: 8 address bits and 4 data bits ht12f: 12 address bits only built-in oscillator needs only 5% resistor valid transmission indicator easy interface with an rf or an infrared transmission medium minimal external components applications burglar alarm system smoke and fire alarm system garage door controllers car door controllers car alarm system security system cordless telephones other remote control systems
block diagram note: the address/data pins are available in various combinations (see the address/data table). pin assignment 2 12 series of decoders 2 july 12, 1999 !" # # # $ $% $ $ $& $' $( $) $* # # # !" % + , & ' ( ) * , + , * ) ( ' & % $% $ $ $& $' $( $) $* # # # !" $ $ % $+ $, & ' ( ) * , + , * ) ( ' & % & ' ( ) * , + % % + , * ) ( ' & " # # !" $ $ % $+ $, " $% $ $ $& $' $( $) $* # & ' ( ) * , + % % + , * ) ( ' & " # # !" % + , " $% $ $ $& $' $( $) $* # pin description pin name i/o internal connection description a0~a11 i nmos transmission gate input pins for address a0~a11 setting they can be externally set to vdd or vss. d8~d11 o cmos out output data pins din i cmos in serial data input pin vt o cmos out valid transmission, active high osc1 i oscillator oscillator input pin osc2 o oscillator oscillator output pin vss i negative power supply (gnd) vdd i positive power supply approximate internal connection circuits absolute maximum ratings supply voltage............................... 0.3v to 13v storage temperature................. 50 cto125 c input voltage....................v ss 0.3 to v dd +0.3v operating temperature .............. 20 cto75 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. 2 12 series of decoders 3 july 12, 1999 "- $"- !! " $ . - !" ! $ - / ." electrical characteristics ta=25 c symbol parameter test conditions min. typ. max. unit v dd conditions v dd operating voltage 2.4 5 12 v i stb standby current 5v oscillator stops 0.1 1 a 12v 24 a i dd operating current 5v no load f osc =150khz 200 400 a i o data output source current (d8~d11) 5v v oh =4.5v 1 1.6 ma data output sink current (d8~d11) 5v v ol =0.5v 1 1.6 ma i vt vt output source current 5v v oh =4.5v 1 1.6 ma vt output sink current v ol =0.5v 1 1.6 ma v ih h input voltage 5v 3.5 5v v il l input voltage 5v 0 1v f osc oscillator frequency 5v r osc =51k 150 khz 2 12 series of decoders 4 july 12, 1999 2 12 series of decoders 5 july 12, 1999 functional description operation the 2 12 series of decoders provides various com - binations of addresses and data pins in differ - ent packages so as to pair with the 2 12 series of encoders. the decoders receive data that are transmitted by an encoder and interpret the first n bits of code period as addresses and the last 12 n bits as data, where n is the address code number. a signal on the din pin activates the oscillator which in turn decodes the incoming address and data. the decoders will then check the re - ceived address three times continuously. if the received address codes all match the contents of the decoder s local address, the 12 n bits of data are decoded to activate the output pins and the vt pin is set high to indicate a valid transmission. this will last unless the address code is incorrect or no signal is received. the output of the vt pin is high only when the transmission is valid. otherwise it is always low. output type of the 2 12 series of decoders, the ht12f has no data output pin but its vt pin can be used as a momentary data output. the ht12d, on the other hand, provides 4 latch type data pins whose data remain unchanged until new data are received. part no. data pins address pins output type operating voltage ht12d 4 8 latch 2.4v~12v ht12f 0 12 2.4v~12v flowchart the oscillator is disabled in the standby state and activated when a logic high signal applies to the din pin. that is to say, the din should be kept low if there is no signal input. ! " ! # $ % decoder timing encoder/decoder cross reference table decoders part no. data pins address pins vt pair encoder package encoder decoder dip sop dip sop ht12d 4 8 ht12a 18 20 18 20 ht12e 18 20 ht12f 0 12 ht12a 18 20 18 20 ht12e 18 20 address/data sequence the following table provides address/data sequence for various models of the 2 12 series of decoders. a correct device should be chosen according to the requirements of the individual addresses and data. part no. address/data bits 0 1 2 3 4 5 6 7 8 9 10 11 ht12d a0 a1 a2 a3 a4 a5 a6 a7 d8 d9 d10 d11 ht12f a0 a1 a2 a3 a4 a5 a6 a7 a8 a9 a10 a11 2 12 series of decoders 6 july 12, 1999 0 ' 0 '1 '1 . / 2 1 . . 3 0 # 0 ' oscillator frequency vs supply voltage the recommended oscillator frequency is f oscd (decoder) 50 f osce (ht12e encoder) 1 3 f osce (ht12a encoder). 2 12 series of decoders 7 july 12, 1999 %(% 4 %%05 67 %% (% % % ( % &(% '%% &%% % ( &'()*,+ % & ),0 ) 0 ()0 ( 0 '*0 '&0 &+0 &)0 &&0 &%0 *0 *(0 , 0 %%0 %0 (%0 ,%0 %0 application circuits notes: typical infrared receiver: pic-12043t/pic-12043s (kodeshi corp.) or ltm9052 (liteon corp.) typical rf receiver: jr-200 (juwa corp.) re-99 (ming microsystem, u.s.a.) 2 12 series of decoders 8 july 12, 1999 $% $ $ $& $' $( $) $* # # # !" % + , & ' ( ) * , + , * ) ( ' & % # $% $ $ $& $' $( $) $* # # # !" $ $ % $+ $, & ' ( ) * , + , * ) ( ' & % # 2 12 series of decoders 9 july 12, 1999 copyright 1999 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) 11f, 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 holtek semiconductor (shanghai) ltd. 7th floor, building 2, no.889, yi shan road, shanghai, china tel:021-6485-5560 fax:021-6485-0313 holmate technology corp. 48531 warm springs boulevard, suite 413, fremont, ca 94539 tel: 510-252-9880 fax: 510-252-9885 |
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