HT12A/HT12E 2 12 Series of Encoders

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1 2 2 Series of Encoders Features Operating voltage 2.4V~5V for the HT2A 2.4V~2V for the HT2E Low power and high noise immunity CMOS technology Low standby current: 0.A (typ. at V DD =5V HT2A with a 38kHz carrier for infrared transmission medium Minimum transmission word Four words for the HT2E One word for the HT2A Built-in oscillator needs only 5 resistor Data code has positive polarity Minimal external components Pair with Holteks 2 2 series of decoders 8-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 General Description The 2 2 encoders are a series of CMOS LSIs for remote control system applications. They are capable of encoding information which consists of N address bits and 2N data bits. Each address/data input can be set to one of the two logic states. The programmed addresses/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 HT2E or a DATA trigger on the HT2A further enhances the application flexibility of the 2 2 series of encoders. The HT2A additionally provides a 38kHz carrier for infrared systems. Selection Table Function Address Part No. No. Address/ Data No. HT2A HT2E Data No. Oscillator 455kHz resonator RC oscillator Trigger Carrier Output Negative Polarity Package D8~D 38kHz No 8DIP 20SOP TE No No 8DIP 20SOP Note: Address/Data represents pins that can be either address or data according to the application requirement. Rev..0 January

2 Block Diagram TE Trigger HT2E I? E= J H EL E@ A H = J= 5 A A? J * K BBA H H= I EI I E + K JA H B A H 5 O? + EH? K EJ / = JA + EH? K EJ * E = HO A JA? J H DATA Trigger HT2A : : * I? E= J H EL E@ A H = J= 5 A A? J * K BBA H H= I EI I E + K JA H B A H 5 O? + EH? K EJ / = JA + EH? K EJ * E = HO A JA? J H Note: The address data pins are available in various combinations (refer to the address/data table. H A I I H A I I H A H A I I H A H A I I = J= 7 6 : : : : Rev..0 2 January

3 Pin Description Pin Name I/O Internal Connection Description A0~A7 I CMOS IN Pull-high (HT2A Input pins for address A0~A7 setting These pins can be externally set to VSS or left open NMOS TRANSMISSION GATE PROTECTION DIODE (HT2E AD8~AD I NMOS TRANSMISSION GATE PROTECTION DIODE (HT2E Input pins for address/data AD8~AD setting These pins can be externally set to VSS or left open D8~D I CMOS IN Pull-high Input pins for data D8~D 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 OSC I OSCILLATOR Oscillator input pin OSC2 O OSCILLATOR Oscillator output pin X 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~D are all data input and transmission enable pins of the HT2A. TE is a transmission enable pin of the HT2E. Approximate Internal Connections / K D EC D / : : Rev..0 3 January

4 Absolute Maximum Ratings Supply Voltage (HT2A...V SS 0.3V to V SS +5.5V Input Voltage...V SS 0.3 to V DD +0.3V Operating Temperature...20C to75c Supply Voltage (HT2E...0.3V to 3V Storage Temperature...50C to25c 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 HT2A Ta=25C Symbol Parameter V DD Test Conditions Conditions Min. Typ. Max. Unit V DD Operating Voltage V I STB I DD Standby Current Operating Current 3V 0. A Oscillator stops 5V 0. A 3V No load A 5V f OSC =455kHz A I DOUT Output Drive Current 5V V OH =0.9V DD (Source.6 ma V OL =0.V DD (Sink 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~D Pull-high Resistance 5V V DATA =0V k HT2E Ta=25C Symbol Parameter V DD Test Conditions Conditions Min. Typ. Max. Unit V DD Operating Voltage V I STB I DD Standby Current Operating Current 3V 0. A Oscillator stops 2V 2 4 A 3V No load fosc =3kHz A 2V A I DOUT Output Drive Current 5V V OH =0.9V DD (Source.6 ma V OL =0.V DD (Sink.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 =.M 3 khz R TE TE Pull-high Resistance 5V V TE =0V.5 3 M Rev..0 4 January

5 Functional Description Operation The 2 2 series of encoders begin a 4-word transmission cycle upon receipt of a transmission enable (TE for the HT2E or D8~D for the HT2A active low. This cycle will repeat itself as long as the transmission enable (TE or D8~D is held low. Once the transmission enable returns high the encoder output completes its final cycle and then stops as shown below. A H 7 6 M H@ M H@ I 6 H= I + JE K K I O M H@ I Transmission timing for the HT2E A O E A H 7 6 M H@ M H@ 6 H= I + JE K K I O M EJD 0? = HHEA H M H@ Transmission timing for the HT2A (L/M=Floating or VDD A O E A H 7 6 M H@ M H@ M H@ I = J= 6 H= I + JE K K I O = J= M H@ I M H@ Transmission timing for the HT2A (L/M=VSS Information Word If L/M= the device is in the latch mode (for use with the latch type of data decoders. When the transmission enable is removed during a transmission the DOUT pin outputs a complete word and then stops. On the other hand if L/M=0 the device 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 data code. An information word consists of 4 periods as illustrated below. > EJI O? F A F E JF A > HA I A F A Composition of = A F A Rev..0 5 January

6 Address/Data Waveform Each programmable address/data pin can be externally set to one of the following two logic states as shown below. B 5 + A HA I I = J= * EJ Address/Data bit waveform for the HT2E B 5 + = J= HA I I * EJ A A H A A H = J= HA I I * EJ 0? = HHEA H Address/Data bit waveform for the HT2A The address/data bits of the HT2A 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 2 bits of address/data serially in the order A0 to AD for the HT2E encoder and A0 to D for the HT2A 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 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 HT2E: H= I EI I E EK Rev..0 6 January

7 The transmitted information is as shown: Pilot Sync. A0 A 0 A2 A3 0 A4 0 A5 0 A6 A7 AD8 AD9 AD0 AD 0 Address/Data Sequence The following provides the address/data sequence table for various models of the 2 2 series of encoders. Address/Data Bits Part No HT2A A0 A A2 A3 A4 A5 A6 A7 D8 D9 D0 D HT2E A0 A A2 A3 A4 A5 A6 A7 AD8 AD9 AD0 AD Transmission Enable For the HT2E encoders transmission is enabled by applying a low signal to the TE pin. For the HT2A encoders transmission is enabled by applying a low signal to one of the data pins D8~D. Two Erroneous HT2E Application Circuits The HT2E must follow closely the application circuits provided by Holtek (see the Application circuits. Error: AD8~AD pins input voltage > V DD +0.3V Error: The ICs power source is activated by pins AD8~AD Rev..0 7 January

8 Flowchart HT2A HT2E 2 M A H 2 M A H 5 > A 5 > A = J= A = > A 6 H= I EI I E A = > ; A I ; A I = J= M EJD? = HHEA H I A HE= K JF K = J= M H@ I JH= I = J= I JEA = > ; A I 6 H= I EI I E I JEA = > ; A I * / 5 JD A = I A ; A I 5 JE A I B H = BJD = A = J= M H@ I JH= I JE K K I O Note: D8~D are transmission enables of the HT2A. TE is the transmission enable of the HT2E. Rev..0 8 January

9 Oscillator Frequency vs. Supply Voltage B 5 + 5? = A The recommended oscillator frequency is f OSCD (decoder 50 f OSCE (HT2E encoder 3 f OSCE (HT2A encoder Application Circuits 9 6 H= I EJJA H+ EH? K EJ 7 6 : : * 9 9 F F Rev..0 9 January

10 Package Information 8-pin DIP (300mil Outline Dimensions * / = Symbol Dimensions in mil Min. Nom. Max. A B C D E 6 20 F G 00 H I Rev..0 0 January

11 20-pin SOP (300mil Outline Dimensions * + + / 0 - = Symbol Dimensions in mil Min. Nom. Max. A B C 4 20 C D E 50 F 4 G H Rev..0 January

12 Product Tape and Reel Specifications Reel Dimensions 6 * + 6 SOP 20W Symbol Description Dimensions in mm A Reel Outer Diameter B Reel Inner Diameter 62.5 C Spindle Hole Diameter D Key Slit Width T Space Between Flange T2 Reel Thickness Rev..0 2 January

13 Carrier Tape Dimensions 2 2 J * 2 SOP 20W Symbol Description Dimensions in mm W Carrier Tape Width P Cavity Pitch E Perforation Position.750. F Cavity to Perforation (Width Direction.50. D Perforation Diameter.5+0. D Cavity Hole Diameter P0 Perforation Pitch P Cavity to Perforation (Length Direction A0 Cavity Length B0 Cavity Width K0 Cavity Depth t Carrier Tape Thickness C Cover Tape Width 2.3 Rev..0 3 January

14 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 5 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 72 Jinyu Tower A29 West Xuan Wu Men Street Xicheng District Beijing China 0003 Tel: Fax: Holtek Semiconductor Inc. (Chengdu Sales Office 709 Building 3 Champagne Plaza No.97 Dongda Street Chengdu Sichuan China 6006 Tel: Fax: Holmate Semiconductor Inc. (North America Sales Office Fremont Blvd. Fremont CA Tel: Fax: Copyright 2003 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 Rev..0 4 January