HT6026 Remote Control Encoder
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1 Remote Control Encoder Features Operating voltage: 4V~18V Low standby current Low power and high noise immunity CMOS technology 3 9 different codes Applications Burglar alarm system Smoke and fire alarm system Garage door controllers Car alarm system 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 General Description The 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 9N data bits. Each address/data input is externally trinary programmable by external switches. The programmable Pin Assignment address/data is transmitted along with the header bits via an RF or an infrared transmission medium upon receipt of a trigger signal (TE). Block Diagram % & ' 0 6, , & % I? E= J H ' 6 H= I EI I E / = JA + EH? K EJI, EL E@ A H ' + K JA H B', A HI 6 HE = HO, A JA? J H, = J= 5 A A? J * K BBA H 5 O? + EH? K EJ, 7 6 & October 2, 1997
2 Pad Coordinates Unit: m % Chip size: (m) 2 Pad No. X Y Pad No * The IC substrate should be connected to VSS in the PCB layout artwork. Pin Description Pin No. Pin Name I/O & % ' &, 7 6 1~7 AD0~AD6 I Internal Connection TRANSMISSION GATE Description 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 X Y 2 October 2, 1997
3 Approximate internal connection circuits 6 4 ) / ) K D EC D ) Absolute Maximum Ratings Supply Voltage...0.3V to 24V Input Voltage...V SS 0.3 to V DD +0.3V Storage Temperature...50C to125c Operating Temperature...20C to75c 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 reliability. Electrical Characteristics Ta=25C Symbol Parameter V DD Test Conditions Min. Typ. Max. Unit Conditions V DD Operating Voltage 4 18 V I STB I DD I DOUT Standby Current 5V Oscillator stops A 15V A Operating Current 5V No load, f OSC =18kHz A 15V No load, f OSC =22kHz A 5V VOH =0.9V DD (Source) ma Output Drive Current 15V ma 5V VOL =0.1V DD (Sink) ma 15V ma V IH H Input Voltage 0.7V DD VDD V V IL L Input Voltage 0 0.3V DD V R TE f OSC 5V 800 k TE Pull-high Resistance VTE =0V 15V 250 k 5V R EXT =10k 18 khz Oscillator Frequency C EXT =2000PF 15V R S= 20k 22 khz 3 October 2, 1997
4 Functional Description Operation The 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 N2 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., 7 6 I J M H@ M H@ I J M H@ 6 H= I + JE K K I O H M H@ I M H@ I Transmission timing Information word An information word consists of two periods as shown: 2 E JF A &?? I A I F A %?? I I JM H@ 2 E JF A I Information Composition A I F A %?? M H@ Address/data waveform Each programmable address/data pin can be externally set to one of the following three logic states: B I? A A H F HA I I, = J= * EJ Address/Data bit waveform 4 October 2, 1997
5 Address/data programming (preset) The status of each address/data pin can be individually preset to logic high, low, orfloating. 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 1A (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 electronic switches. The following figure demonstrates an application using the : : : , 7 6 % & H= I EI I E EK The transmitted information is as listed: Pilot & Sync. AD0 1 AD1 AD2 1 AD3 AD4 AD5 AD6 0 AD7 1 AD8 : floating 5 October 2, 1997
6 Transmission enable Transmission is enabled by applying a low signal to the TE pin. The is enabled and outputs address/data codes from the DOUT pin when TE is set to low for more than 65ns. Flowchart 2 M A H 5 > A 6 H= I EI I E I JEA = > A ; A I ; A I A M H@ 6 H= I + JE K K I O A M H@ 6 H= I + JE K K I O Oscillator frequency vs supply voltage B I? 5? = A 4 - : : 6 F % 0 % 4 - : : 6 F 4 - : : 6 F % & & 4 - : : 6 F 4 - : : 6 F 4 - : : 6 F 4 - : : 6 F 4 - : : 6 F 8, + 6 October 2, 1997
7 Application Circuit 6 H= I EJJA H+ EH? K EJ % & 8 5 5, & % ' 4 - : : B I? 4 - : : 6 + ) ; 7 6 F B H 0 B I? 0 M D A HA 4 5 ( 4 - : : 6 9 F + - : , October 2, 1997
8 Holtek Semiconductor Inc. (Headquarters) No.3, Creation Rd. II, Science Park, Hsinchu, Taiwan Tel: Fax: Holtek Semiconductor Inc. (Taipei Sales Office) 4F-2, No. 3-2, YuanQu St., Nankang Software Park, Taipei 115, Taiwan Tel: Fax: Fax: (International sales hotline) Holtek Semiconductor Inc. (Shanghai Sales Office) 7th Floor, Building 2, No.889, Yi Shan Rd., Shanghai, China Tel: Fax: Holtek Semiconductor Inc. (Shenzhen Sales Office) 5/F, Unit A, Productivity Building, Cross of Science M 3rd Road and Gaoxin M 2nd Road, Science Park, Nanshan District, Shenzhen, China Tel: , Fax: Holtek Semiconductor Inc. (Beijing Sales Office) Suite 1721, Jinyu Tower, A129 West Xuan Wu Men Street, Xicheng District, Beijing, China Tel: , , Fax: Holtek Semiconductor Inc. (Chengdu Sales Office) 709, Building 3, Champagne Plaza, No.97 Dongda Street, Chengdu, Sichuan, China Tel: Fax: Holmate Semiconductor, Inc. (North America Sales Office) Fremont Blvd., Fremont, CA Tel: Fax: Copyright 1997 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. Holteks 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 8 October 2, 1997
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