HT6026 Remote Control Encoder Features · · · · Operating voltage: 4V~18V Low standby current Low power and high noise immunity CMOS technology 39 different codes · Minimum of two transmission words Built-in oscillator needs only 5% resistor Interface with RF or infrared transmission medium Minimal external components · · · Security system Cordless telephones Other remote control systems · · · Applications · · · · Burglar alarm system Smoke and fire alarm system Garage door controllers Car alarm system 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 address/data input is externally trinary programmable 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. Pin Assignment A D 0 1 1 6 V D D A D 1 2 1 5 D O U T A D 2 3 1 4 T E A D 3 4 1 3 O S C 3 A D 4 5 1 2 O S C 2 A D 5 6 1 1 O S C 1 A D 6 7 1 0 A D 8 V S S 8 9 A D 7 H T 6 0 2 6 1 6 D IP /N S O P Block Diagram O S C 2 O S C 1 O S C 3 O s c illa to r ¸ 4 D iv id e r 9 ¸ 9 C o u n te r & 1 o f 9 D e c o d e rs T r a n s m is s io n G a te C ir c u its T E A D 0 1 A D 8 D a ta S e le c t & B u ffe r D O U T S y n c . C ir c u it T r in a r y D e te c to r V D D V S S October 2, 1997 HT6026 Pad Coordinates A D 0 V D D D O U T T E 1 6 1 5 1 4 1 3 1 A D 1 A D 2 2 A D 3 3 A D 4 4 A D 5 5 Unit: mm 1 2 (0 ,0 ) 7 8 9 A D 7 A D 8 6 V S S A D 6 Pad No. O S C 3 1 1 O S C 2 1 0 O S C 1 X Pad No. Y X Y 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 2 Chip size: 1650 ´ 1680 (mm) * The IC substrate should be connected to VSS in the PCB layout artwork. Pin Description 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 ¾ 9~10 AD7~AD8 I TRANSMISSION GATE 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 15 DOUT O CMOS OUT 16 VDD Pin No. Negative power supply (GND) Input pins for address/data AD7~AD8 setting. They can be externally set to VDD, VSS, or left open. Transmission enable, active low Encoder data serial transmission output Positive power supply ¾ 2 October 2, 1997 HT6026 Approximate internal connection circuits T R A N S M IS S IO N G A T E C M O S IN P u ll- h ig h C M O S O U T O S C IL L A T O R E N O S C 1 O S C 2 O S C 3 Absolute Maximum Ratings Supply Voltage...............................-0.3V to 24V Storage Temperature.................-50°C to 125°C Input Voltage....................VSS-0.3 to VDD+0.3V Operating Temperature ..............-20°C to 75°C Note: These are stress ratings only. Stresses exceeding the range specified under ²Absolute Maximum Ratings² 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 reliability. Electrical Characteristics Symbol Parameter VDD Operating Voltage ISTB Standby Current IDD Operating Current Ta=25°C Test Conditions Min. Typ. Max. Unit 4 ¾ 18 V ¾ 0.1 0.3 mA ¾ 0.1 0.5 mA No load, fOSC=18kHz ¾ 500 900 mA 15V No load, fOSC=22kHz ¾ 2000 3000 mA -1.0 -1.7 ¾ mA -8.0 -14.0 ¾ mA 0.8 1.5 ¾ mA 5.0 10.0 ¾ mA VDD Conditions ¾ ¾ 5V 15V 5V 5V IDOUT Output Drive Current 15V 5V 15V Oscillator stops VOH=0.9VDD (Source) VOL=0.1VDD (Sink) VIH ²H² Input Voltage ¾ ¾ 0.7VDD ¾ VDD V VIL ²L² Input Voltage ¾ ¾ 0 ¾ 0.3VDD V RTE TE Pull-high Resistance ¾ 800 ¾ kW ¾ 250 ¾ kW fOSC Oscillator Frequency ¾ 18 ¾ kHz ¾ 22 ¾ kHz 5V 15V VTE=0V REXT=10kW CEXT=2000PF 15V RS=20kW 5V 3 October 2, 1997 HT6026 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 allowed is always automatically adjusted to an even number. T E 6 5 n s < t< 1 w o rd t > 1 w o rd D O U T 2 T r a n s m itte d 1 o r 2 w o rd s C o n tin u o u s ly N ´ 2 w o rd s (N = 1 ,2 ,3 ,....) w o rd s Transmission timing Information word An information word consists of two periods as shown: P ilo t p e r io d ( 1 8 c lo c k s ) A D 0 ~ A D 8 c o d e s p e r io d ( 7 2 c lo c k s ) P ilo t p e r io d ( 2 4 c lo c k s ) 1 s t w o rd A D 0 ~ A D 8 c o d e s p e r io d ( 7 2 c lo c k s ) 2 n d w o rd Information Composition Address/data waveform Each programmable address/data pin can be externally set to one of the following three logic states: fo s c "O n e " "Z e ro " "O p e n " A d d r e s s /D a ta B it Address/Data bit waveform 4 October 2, 1997 HT6026 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 electronic switches. Address/data programming (preset) The status of each address/data pin can be individually preset to logic ²high², ²low², or ²floating². 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 1mA (for VDD=5V). The following figure demonstrates an application using the HT6026: R R S C O S C 1 E X T E X T O S C 2 O S C 3 D O U T V D D A D 0 A D 1 A D 2 A D 3 A D 4 A D 5 A D 6 A D 7 A D 8 T E T r a n s m is s io n m e d iu m V S S V D D V S S The transmitted information is as listed: Pilot & Sync. AD0 AD1 AD2 AD3 AD4 AD5 AD6 AD7 AD8 1 Z 1 Z Z Z 0 1 Z Z: floating 5 October 2, 1997 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 ²low² for more than 65ns. Flowchart P o w e r o n S ta n d b y m o d e T r a n s m is s io n s till e n a b le ? N o T E = 0 ? N o Y e s Y e s C o d e w o rd T r a n s m itte d C o n tin u o u s ly C o d e w o rd T r a n s m itte d C o n tin u o u s ly Oscillator frequency vs supply voltage fo s c (S c a le ) 3 .5 0 R E X T = 1 0 k W , R S = 2 0 k W , C E X T = 1 0 0 p F R E X T = 1 0 k W , R S = 2 0 k W , C E X T = 2 5 0 p F R E X T = 1 0 k W , R S = 2 0 k W , C E X T = 5 0 0 p F R E X T = 1 0 k W , R S = 2 0 k W , C E X T = 1 0 0 0 p F E X T = 2 0 0 0 p F 3 .2 5 3 .0 0 2 .7 5 2 .5 0 2 .2 5 (2 0 0 k H z ) 2 .0 0 1 .7 5 1 .5 0 1 .2 5 1 .0 0 0 .7 5 0 .5 0 0 .2 5 R E X T = 1 0 k W , R S = 2 0 k W , C 0 .1 0 0 .0 5 0 .0 2 R E X T = 1 0 k W , R = 5 1 k W , R = 5 1 k W , R S = 2 0 k W , C E = 1 0 0 k W , C = 1 0 0 k W , C 2 R 4 6 8 1 0 1 2 1 4 1 6 6 1 8 2 0 2 2 2 4 R E X T E X T V D D S S X T = 5 0 0 0 p F = 2 0 0 0 p F = 5 0 0 0 p F E X T E X T (V D C ) October 2, 1997 HT6026 Application Circuit T r a n s m itte r C ir c u it 1 2 3 4 5 6 7 8 A D 0 V D D A D 1 D O U T A D 2 T E A D 3 O S C 3 A D 4 O S C 2 A D 5 O S C 1 A D 6 A D 8 V S S A D 7 V D D 1 6 1 0 0 m F /2 5 V 1 5 1 4 R 1 3 1 2 1 1 C E X T R 1 fo s c = E X T 2 .3 R (C E X T E X T + C L A Y O U T + 1 2 p F ) (H z ) fo r 1 k H z < fo s c < 4 0 0 k H z S w h e re R 1 0 R 9 R @ 2 R E X T > 2 0 k W > 1 0 k W 4 0 0 p F < C E S S E X T X T < 1 5 m F H T 6 0 2 6 1 6 D IP /N S O P Notes: Typical infrared diode: EL-1L2 (KODENSHI CORP.) Typical RF transmitter: JR-220 (JUWA CORP.) 7 October 2, 1997 HT6026 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 Copyright ã 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 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. 8 October 2, 1997