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ht12a/ht12e 2 12 series of encoders selection table function address no. address/ data no. data no. oscillator trigger carrier output negative polarity package part no. ht12a 8 0 4 455khz resonator d8~d11 38khz no 18dip, 20sop ht12e 8 4 0 rc oscillator te no no 18dip, 20sop note: address/data represents pins that can be either address or data according to the application requirement. rev. 1.20 1 february 20, 2009 general description the 2 12 encoders are a series of cmos lsis for remote control system applications. they are capable of encod- ing information which consists of n address bits and 12 n data bits. each address/data input can be set to one of the two logic states. the programmed ad- dresses/data are transmitted together with the header bits via an rf or an infrared transmission medium upon receipt of a trigger signal. the capability to select a te trigger on the ht12e or a data trigger on the ht12a further enhances the application flexibility of the 2 12 se- ries of encoders. the ht12a additionally provides a 38khz carrier for infrared systems. features operating voltage 2.4v~5v for the ht12a 2.4v~12v for the ht12e low power and high noise immunity cmos technology low standby current: 0.1 a (typ.) at v dd =5v ht12a with a 38khz carrier for infrared transmission medium minimum transmission word four words for the ht12e one word for the ht12a built-in oscillator needs only 5% resistor data code has positive polarity minimal external components pair with holtek s2 12 series of decoders 18-pin dip, 20-pin sop package 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 te trigger ht12e data trigger ht12a note: the address data pins are available in various combinations (refer to the address/data table). pin assignment ht12a/ht12e rev. 1.20 2 february 20, 2009

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pin description pin name i/o internal connection description a0~a7 i cmos in pull-high (ht12a) input pins for address a0~a7 setting these pins can be externally set to vss or left open nmos transmission gate protection diode (ht12e) ad8~ad11 i nmos transmission gate protection diode (ht12e) input pins for address/data ad8~ad11 setting these pins can be externally set to vss or left open d8~d11 i cmos in pull-high input pins for data d8~d11 setting and transmission enable, active low these pins should be externally set to vss or left open (see note) dout o cmos out encoder data serial transmission output l/m i cmos in pull-high latch/momentary transmission format selection pin: latch: floating or vdd momentary: vss te i cmos in pull-high transmission enable, active low (see note) osc1 i oscillator 1 oscillator input pin osc2 o oscillator 1 oscillator output pin x1 i oscillator 2 455khz resonator oscillator input x2 o oscillator 2 455khz resonator oscillator output vss i negative power supply, ground vdd i positive power supply note: d8~d11 are all data input and transmission enable pins of the ht12a. te is a transmission enable pin of the ht12e. approximate internal connections ht12a/ht12e rev. 1.20 3 february 20, 2009 . * / . * 0 0 . * 0 . 1 2 3 4 3 * # 0 ( ( / 0 ( ( / + + . . * / . * 0 0 . 1 / 0 . 0
absolute maximum ratings supply voltage (ht12a) ............v ss 0.3v to v ss +5.5v supply voltage (ht12e) ........................... 0.3v to 13v input voltage ................................v ss 0.3 to v dd +0.3v storage temperature ............................ 50 cto125 c operating temperature ........................... 20 cto75 c 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 reliabil - ity. electrical characteristics ht12a ta=25 c symbol parameter test conditions min. typ. max. unit v dd conditions v dd operating voltage 2.4 3 5 v i stb standby current 3v oscillator stops 0.1 1 a 5v 0.1 1 a i dd operating current 3v no load f osc =455khz 200 400 a 5v 400 800 a i dout output drive current 5v v oh =0.9v dd (source) 1 1.6 ma v ol =0.1v dd (sink) 2 3.2 ma v ih h input voltage 0.8v dd v dd v v il l input voltage 0 0.2v dd v r data d8~d11 pull-high resistance 5v v data =0v 150 300 k ht12e 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 3v oscillator stops 0.1 1 a 12v 24 a i dd operating current 3v no load, f osc =3khz 40 80 a 12v 150 300 a i dout output drive current 5v v oh =0.9v dd (source) 1 1.6 ma v ol =0.1v dd (sink) 1 1.6 ma v ih h input voltage 0.8v dd v dd v v il l input voltage 0 0.2v dd v f osc oscillator frequency 5v r osc =1.1m 3 khz r te te pull-high resistance 5v v te =0v 1.5 3 m ht12a/ht12e rev. 1.20 4 february 20, 2009
functional description operation the 2 12 series of encoders begin a 4-word transmission cycle upon receipt of a transmission enable (te for the ht12e or d8~d11 for the ht12a, active low). this cycle will repeat itself as long as the transmission enable (te or d8~d11) is held low. once the transmission enable returns high the encoder output completes its final cycle and then stops as shown below. information word if l/m =1 the device is in the latch mode (for use with the latch type of data decoders). when the transmission enable is re - moved during a transmission, the dout pin outputs a complete word and then stops. on the other hand, if l/m =0 the de - vice is in the momentary mode (for use with the momentary type of data decoders). when the transmission enable is removed during a transmission, the dout outputs a complete word and then adds 7 words all with the 1 data code. an information word consists of 4 periods as illustrated below. ht12a/ht12e rev. 1.20 5 february 20, 2009 , 5
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transmission timing for the ht12e
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composition of information
address/data waveform each programmable address/data pin can be externally set to one of the following two logic states as shown below. the address/data bits of the ht12a are transmitted with a 38khz carrier for infrared remote controller flexibility. address/data programming (preset) the status of each address/data pin can be individually pre-set to logic high or low . if a transmission-enable signal is applied, the encoder scans and transmits the status of the 12 bits of address/data serially in the order a0 to ad11 for the ht12e encoder and a0 to d11 for the ht12a encoder. during information transmission these bits are transmitted with a preceding synchronization bit. if the trigger signal is not applied, the chip enters the standby mode and consumes a reduced current of less than 1 a for a supply voltage of 5v. usual applications preset the address pins with individual security codes using dip switches or pcb wiring, while the data is selected by push buttons or electronic switches. the following figure shows an application using the ht12e: ht12a/ht12e rev. 1.20 6 february 20, 2009 a a a b
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) address/data bit waveform for the ht12e a a a b
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address/data bit waveform for the ht12a ! , & ' " % - ! #

the transmitted information is as shown: pilot & sync. a0 1 a1 0 a2 1 a3 0 a4 0 a5 0 a6 1 a7 1 ad8 1 ad9 1 ad10 1 ad11 0 address/data sequence the following provides the address/data sequence table for various models of the 2 12 series of encoders. part no. address/data bits 01234567891011 ht12a a0 a1 a2 a3 a4 a5 a6 a7 d8 d9 d10 d11 ht12e a0 a1 a2 a3 a4 a5 a6 a7 ad8 ad9 ad10 ad11 transmission enable for the ht12e encoders, transmission is enabled by applying a low signal to the te pin. for the ht12a encoders, transmission is enabled by applying a low signal to one of the data pins d8~d11. two erroneous ht12e application circuits the ht12e must follow closely the application circuits provided by holtek (see the application circuits). error: ad8~ad11 pins input voltage > v dd +0.3v error: the ic s power source is activated by pins ad8~ad11 ht12a/ht12e rev. 1.20 7 february 20, 2009 ! - % ! - %
flowchart ht12a ht12e note: d8~d11 are transmission enables of the ht12a. te is the transmission enable of the ht12e. ht12a/ht12e rev. 1.20 8 february 20, 2009 ? ? c . . 5 3

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oscillator frequency vs. supply voltage the recommended oscillator frequency is f oscd (decoder)
50 f osce (ht12e encoder)
1 3 f osce (ht12a encoder) application circuits ht12a/ht12e rev. 1.20 9 february 20, 2009 , & ' " % - ! $ ! ! $ ! ! < 9 : ; > $ ! ! , $ ! ! & $ ! ! ' $ ! ! " $ ! !

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package information 18-pin dip (300mil) outline dimensions ms-001d (see fig1) symbol dimensions in mil min. nom. max. a 880 920 b 240 280 c 115 195 d 115 150 e1 4 22 f4 5 70 g 100 h 300 325 i 430 ms-001d (see fig2) symbol dimensions in mil min. nom. max. a 845 880 b 240 280 c 115 195 d 115 150 e1 4 22 f4 5 70 g 100 h 300 325 i 430 ht12a/ht12e rev. 1.20 10 february 20, 2009
fig1. full lead packages
fig2. 1 / 2 lead packages
mo-095a (see fig2) symbol dimensions in mil min. nom. max. a 845 885 b 275 295 c 120 150 d 110 150 e1 4 22 f4 5 60 g 100 h 300 325 i 430 ht12a/ht12e rev. 1.20 11 february 20, 2009
20-pin sop (300mil) outline dimensions ms-013 symbol dimensions in mil min. nom. max. a 393 419 b 256 300 c1 2 20 c 496 512 d 104 e 50 f4 12 g1 6 50 h8 13 08 ht12a/ht12e rev. 1.20 12 february 20, 2009 ! ! e f :
product tape and reel specifications reel dimensions sop 20w symbol description dimensions in mm a reel outer diameter 330.01.0 b reel inner diameter 100.01.5 c spindle hole diameter 13.0 +0.5/-0.2 d key slit width 2.00.5 t1 space between flange 24.8 +0.3/-0.2 t2 reel thickness 30.20.2 ht12a/ht12e rev. 1.20 13 february 20, 2009
carrier tape dimensions sop 20w symbol description dimensions in mm w carrier tape width 24.0 +0.3/-0.1 p cavity pitch 12.00.1 e perforation position 1.750.10 f cavity to perforation (width direction) 11.50.1 d perforation diameter 1.5 +0.1/-0.0 d1 cavity hole diameter 1.50 +0.25/-0.00 p0 perforation pitch 4.00.1 p1 cavity to perforation (length direction) 2.00.1 a0 cavity length 10.80.1 b0 cavity width 13.30.1 k0 cavity depth 3.20.1 t carrier tape thickness 0.300.05 c cover tape width 21.30.1 ht12a/ht12e rev. 1.20 14 february 20, 2009 1 g 1 1 ! e 8 ! ! ! 0 @ 9 4 @ 3
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ht12a/ht12e rev. 1.20 15 february 20, 2009 copyright 2009 by holtek semiconductor inc. the information appearing in this data sheet is believed to be accurate at the time of publication. however, holtek as - sumes 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 s products are not authorized for use as critical components in life support devices or systems. 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 park, hsinchu, taiwan tel: 886-3-563-1999 fax: 886-3-563-1189 http://www.holtek.com.tw holtek semiconductor inc. (taipei sales office) 4f-2, no. 3-2, yuanqu st., nankang software park, taipei 115, taiwan tel: 886-2-2655-7070 fax: 886-2-2655-7373 fax: 886-2-2655-7383 (international sales hotline) holtek semiconductor inc. (shanghai sales office) g room, 3 floor, no.1 building, no.2016 yi-shan road, minhang district, shanghai, china 201103 tel: 86-21-5422-4590 fax: 86-21-5422-4705 http://www.holtek.com.cn holtek semiconductor inc. (shenzhen sales office) 5f, unit a, productivity building, gaoxin m 2nd, middle zone of high-tech industrial park, shenzhen, china 518057 tel: 86-755-8616-9908, 86-755-8616-9308 fax: 86-755-8616-9722 holtek semiconductor inc. (beijing sales office) suite 1721, jinyu tower, a129 west xuan wu men street, xicheng district, beijing, china 100031 tel: 86-10-6641-0030, 86-10-6641-7751, 86-10-6641-7752 fax: 86-10-6641-0125 holtek semiconductor inc. (chengdu sales office) 709, building 3, champagne plaza, no.97 dongda street, chengdu, sichuan, china 610016 tel: 86-28-6653-6590 fax: 86-28-6653-6591 holtek semiconductor (usa), inc. (north america sales office) 46729 fremont blvd., fremont, ca 94538, usa tel: 1-510-252-9880 fax: 1-510-252-9885 http://www.holtek.com

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