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ht6026 remote control encoder pin assignment block diagram 1 october 2, 1997 general description the ht6026 is a cmos lsi encoder designed for remote control system applications. it is capable of encoding 9 bits of information which consists of n address bits and 9 n data bits. each ad - dress/data input is externally trinary program - mable by external switches. the programmable address/data is transmitted along with the header bits via an rf or an infrared transmission medium upon receipt of a trigger signal (te ). the ht6026 is pin compatible with the mc145026. features operating voltage: 4v~18v low standby current low power and high noise immunity cmos technology 3 9 different codes minimum of two transmission words built-in oscillator needs only 5% resistor interface with rf or infrared transmission medium minimal external components applications burglar alarm system smoke and fire alarm system garage door controllers car alarm system security system cordless telephones other remote control systems

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pad coordinates unit: m pad no. xy pad no. xy 1 598.00 689.00 9 160.00 687.00 2 674.00 433.00 10 670.00 687.00 3 674.00 126.00 11 670.00 347.00 4 674.00 162.00 12 670.00 172.00 5 674.00 449.00 13 670.50 689.50 6 598.00 687.00 14 270.00 689.00 7 342.00 687.00 15 84.00 689.00 8 127.00 687.00 16 299.00 689.00 chip size: 1650 1680 ( m) 2 * the ic substrate should be connected to vss in the pcb layout artwork. pin description pin no. pin name i/o internal connection description 1~7 ad0~ad6 i transmission gate input pins for address/data ad0~ad6 setting. they can be externally set to vdd, vss, or left open. 8 vss i negative power supply (gnd) 9~10 ad7~ad8 i transmission gate input pins for address/data ad7~ad8 setting. they can be externally set to vdd, vss, or left open. 11 osc1 i oscillator oscillator input pin 12 osc2 o oscillator oscillator output pin 13 osc3 o oscillator oscillator output pin 14 te i cmos in pull-high transmission enable, active low 15 dout o cmos out encoder data serial transmission output 16 vdd positive power supply ht6026 2 october 2, 1997
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approximate internal connection circuits absolute maximum ratings supply voltage............................... 0.3v to 24v 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. electrical characteristics ta=25 c symbol parameter test conditions min. typ. max. unit v dd conditions v dd operating voltage 4 18 v i stb standby current 5v oscillator stops 0.1 0.3 a 15v 0.1 0.5 a i dd operating current 5v no load, f osc =18khz 500 900 a 15v no load, f osc =22khz 2000 3000 a i dout output drive current 5v v oh =0.9v dd (source) 1.0 1.7 ma 15v 8.0 14.0 ma 5v v ol =0.1v dd (sink) 0.8 1.5 ma 15v 5.0 10.0 ma v ih h input voltage 0.7v dd v dd v v il l input voltage 0 0.3v dd v r te te pull-high resistance 5v v te =0v 800 k 15v 250 k f osc oscillator frequency 5v r ext =10k c ext =2000pf r s= 20k 18 khz 15v 22 khz ht6026 3 october 2, 1997 ,-. // - " . /- 0#1232 . /44 , -
functional description operation the ht6026 encoder begins a one-word transmission cycle upon receipt of a transmission enable (te , active low). this cycle will repeat itself as long as the transmission enable (te ) is held low. once the transmission enable returns high, the encoder output completes its final n 2 word cycle, and then stops as shown in the transmission timing diagram below. the total number of transmission cycles al - lowed is always automatically adjusted to an even number. information word an information word consists of two periods as shown: address/data waveform each programmable address/data pin can be externally set to one of the following three logic states: ht6026 4 october 2, 1997 5 6 )7+ 5 6 )7+ 0 6 )7+ 0 6 )7+ 8 8 information composition 9 9 9:9 % 9 6 9 ; ' address/data bit waveform 8 8 ! ##& <<8 - 8 )- = * * *((((+ > 8 transmission timing
the transmitted information is as listed: pilot & sync. ad0 1 ad1 z ad2 1 ad3 z ad4 z ad5 z ad6 0 ad7 1 ad8 z z: floating ht6026 5 october 2, 1997 ! ! #! , ? , ? address/data programming (preset) the status of each address/data pin can be indi - vidually preset to logic high , low ,or float - ing . if a transmission enable signal is applied, the encoder scans and transmits the status of the 9-bit address/data serially in the order ad0 to ad8. but if the trigger signal is not applied, the chip only consumes a standby current which is less than 1 a (for vdd=5v). the address pins are usually preset to transmit data codes with their own particular security codes by the dip switches or pcb wiring, while the data is selected using push buttons or elec - tronic switches. the following figure demonstrates an applica - tion using the ht6026:
transmission enable transmission is enabled by applying a low signal to the te pin. the ht6026 is enabled and outputs address/data codes from the dout pin when te is set to low for more than 65ns. flowchart oscillator frequency vs supply voltage ht6026 6 october 2, 1997 = @ 08 a&! - 8 ! ##& b b ! a@ - 8 ! ##& ( ( ( ( ( ( ) 7c d+( ( ( ( ( ( ( , ? = 7 *, = 7 * ? = 6e , ? = 7 *, = 7 * ? = 6e , ? = 7 *, = 7 * ? = 6e , ? = 7 *, = 7 * ? = 6e , ? = 7 *, = 7 * ? = 6e , ? = 7 *, = 7 * ? = 6e , ? =7 *, = 7 * ? = 6e , ? =7 *, = 7 * ? = 6e ( ( ( (
application circuit notes: typical infrared diode: el-1l2 (kodenshi corp.) typical rf transmitter: jr-220 (juwa corp.) ht6026 7 october 2, 1997 ! #
, ? ? , e; % = (, ? ) ? f 4b f6e+ %7c d<%< 7c d )c d + 8 2, , ? , > 7 , ? > 7 6e< ? < e

ht6026 8 october 2, 1997 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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