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| ht6p20 series 2 24 otp encoder block diagram note: address/data numbers are available in various combinations, refer to the functional description. rev. 1.10 1 april 17, 2002 features operating voltage: 2v~12v low power consumption built-in oscillator needs only 5% resistor 0/2/4/8 data selectable 2 24 maximum address and data codes easy interface with an rf or ir medium one time programmable process data active: d0~d7 minimal external components ht6p20/a/b: 8-pin dip/nsop package ht6p20/d: 16-pin dip/nsop package general description the ht6p20 is a cmos lsi encoder designed for re - mote control system applications. it encodes 24 bits of information and then serially transmits it via the dout pin upon receipt of transmission enable (data pins: d0~d7) signals. the combination of address and data bits of the ht6p20 is designed using one time program- mable process. in addition, the chip offers various pack - aging for flexible combination of programmable address/data so as to meet various applications. its pro - grammable address/data is transmitted together with the anti-code bits via rf or infrared transmission me- dium upon receipt of a trigger signal. applications burglar alarm system smoke and fire alarm system garage door controllers car door controllers security system cordless telephones other remote control systems ! " # $ pin assignment note: the customer code and control code have been programmed into ht6p20a/b/d by holtek s factory process. the blank device ht6p20 is not programmed, it can be programmed by holtek s programming kit. the 8-pin blank device only allows programming as ht6p20a type and the 16-pin blank device allows pro- gramming as ht6p20d type. pad assignment pad coordinates unit: m pad no. x y 1 956.50 762.75 2 1123.00 498.75 3 1123.00 236.25 4 1123.00 86.25 5 1123.00 261.25 6 1123.00 583.75 7 1027.50 776.75 8 852.50 776.75 9 530.00 776.75 10 355.00 776.75 11 180.00 776.75 12 142.50 776.75 13 317.50 776.75 14 640.00 776.75 15 815.00 776.75 16 1137.50 776.75 17 1118.00 466.75 18 1118.00 205.75 19 489.00 772.05 20 223.50 789.75 ht6p20 series rev. 1.10 2 april 17, 2002 ! % & ' $ ( ) " ! ( ) & % ! # * ! % & ) ( $ ' # " ! ! % + + + + ! % & ' $ ( ) + # ! ( ) & % ! # * ! % & ) ( $ ' # " ! ! , + % , + & , + ) , + ( , + $ , + ! % & ' $ ( ) " ! ! % & ) ( $ ' * # ! % & ) ( $ ' * ! # - # . # / " # ! % & ) ( $ ! + + + + chip size: 2590 2010 ( m) 2 * the ic substrate should be connected to vss in the pcb layout artwork. pin description ht6p20d pin no. pin name i/o internal connection description 16 1~3 d0~d3 i cmos in pull-high data input and transmission enable (active low) they can be externally set to vss or left open. 4 vss negative power supply, ground 5~8 nc no connection 9 osc2 o oscillator oscillator output pin 10 osc1 i oscillator oscillator input pin 11 dout o cmos out data serial transmission output 12 vdd positive power supply 13 vpp i programming power supply, v dd for normal operation 14 sio i/o cmos in/out programming address/control code input and mode code out - put for mode verification 15 pgm i cmos in pull-high program mode control pin, active low approximate internal connection circuits absolute maximum ratings supply voltage ......................................... 0.3v to 12v storage temperature ............................ 50 cto125 c input voltage..............................v ss 0.3v to v dd +0.3v 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 ta=25 c symbol parameter test conditions min. typ. max. unit v dd conditions v dd operating voltage 2 12 v i stb standby current 12v oscillator stops 12 a i dd operating current 12v no load, f osc =3khz 200 400 a v ih h input voltage 0.8v dd v dd v v il l input voltage 0 0.2v dd v r ph d0~d7 pull-high resistance 12v 150 300 k ht6p20 series rev. 1.10 3 april 17, 2002 + , + 0 1 ! symbol parameter test conditions min. typ. max. unit v dd conditions i dout output current source 5v 0.9v dd 2 5 ma 12v 0.9v dd 6.5 15 ma sink 5v 0.1v dd 25 ma 12v 0.1v dd 615 ma f osc oscillator frequency 12v r osc =1.4m 3 khz programming timing of the ht6p20d (b0~b3=1010) ht6p20 series rev. 1.10 4 april 17, 2002 functional description programming the ht6p20 is a one time programmable encoding inte - grated circuit. the programmable codes consist of 4-bit control codes and 24-bit address codes. before using the device, first program the internal 4 control bits and 24 ad - dress bits. then, to program the address and control codes, connect the pgm pin to vss, allowing the sio pin to receive control and address codes from the continu - ously transmitting programming kit. the control codes (b0~b3) and address timing are respectively shown on the table and the figure for programming timing. in the programming process, the mode bit (b0) has to be pro - grammed first. the 0/2/4/8 data number is selected by the address along with the data format bits (b1,b2). the ht6p20, in addition, provides a polarity bit (b3) to select the polarity of the output data. various packages of the ht6p20 offer programmable combinations of address/data to meet various applica- tion needs. table 1: control code mode control (b0) b0 function 0 not programmed 1 programmed address and data format (b1,b2) b2 b1 code format 0 0 a0~a23 0 1 a0~a21 + d1~d0 1 0 a0~a19 + d3~d0 1 1 a0~a15 + d7~d0 polarity control (b3) b3 data output polarity 0 negative polarity 1 positive polarity the ht6p20a/d can be programmed by the sio pins. the ht6p20b, on the other hand, is programmed for 2-data and positive polarity application. ! - % 2 3 4 / " 5 # 5 5 ! 5 % # ! % ' * ! # ! ! ! ! % 6 + 7 - / 5 # 8 5 % - ! / # 8 ! % - % / ! # 8 ! % 9 : 9 3 ( ! # # # # # # # ; ; ; ; - ) / # 7 < = < > 7 < 3 < > ; 7 : - & / 6 < 3 < 5 # ? programming timing for the ht6p20d 5 # 5 5 ! 5 % @ 9 normal operation the ht6p20 encodes and transmits address/data to a decoder upon receipt of a trigger signal. the address codes of the ht6p20a are always transmitted as long as power (vdd) is supplied. the transmission function of the ht6p20b/d is enabled by the d0~d7 pins (active low). the following is the transmission timing of the ht6p20: a complete code word of the ht6p20d consists of 3 periods as shown below. the ht6p20a/b/d detects the logic state of the internal programmed address and the external data pins, and then trans - mits the detected information during the code period. each address/data bit can be set to one of the following two logic states: flowchart ht6p20 series rev. 1.10 5 april 17, 2002 0 ? - & 6 / ? ? - ! % 2 / ? ? , % 6 - # 8 * . ( # 2 / - % 8 # . ! 2 / # # 9 2 a complete code word for the ht6p20d a b = # 8 $ c = transmission timing < < < d < 9 , 6 6 @ 6 e + + f f , = 6 , = @ = " g # e + f + f ? e + 7 ? 6 application circuits ht6p20 series rev. 1.10 6 april 17, 2002 ! 1 $ ! % & ) ( ' " # ! % + + + + * # ! % & ( ) 1 h & i ! " ! 1 ! % & ) ( ' $ 1 h & a i ! a a ! 1 $ ! % & ) ( ' " # ! % + + + + * # ! % & ( ) 1 h & i ! # # # h j note: in order to prevent the ic from getting damaged due to the latch up, the 100 resistor or the led which can also be a transmission indicator is indispensible when v dd =9v~12v. ht6p20 series rev. 1.10 7 april 17, 2002 ! 1 $ ! % & ) ( ' " # ! % + + + + * # ! % & ( ) 1 h & i ! a # h j # # ! 1 $ ! % & ) ( ' " # ! % + + + + * # ! % & ( ) 1 h & a & h $ 2 i ! # h j # # # # 2 ht6p20 series rev. 1.10 8 april 17, 2002 copyright 2002 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 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 tel: 886-3-563-1999 fax: 886-3-563-1189 http://www.holtek.com.tw holtek semiconductor inc. (sales office) 11f, no.576, sec.7 chung hsiao e. rd., taipei, taiwan 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) inc. 7th floor, building 2, no.889, yi shan rd., shanghai, china tel: 021-6485-5560 fax: 021-6485-0313 http://www.holtek.com.cn holmate technology corp. 48531 warm springs boulevard, suite 413, fremont, ca 94539 tel: 510-252-9880 fax: 510-252-9885 http://www.holmate.com |
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