2 12 HT12A/HT12E Series of Encoders Features · · · · Operating voltage - 2.4V~5V for the HT12A - 2.4V~12V for the HT12E Low power and high noise immunity CMOS technology Low standby current: 0.1mA (typ.) at VDD=5V HT12A with a 38kHz carrier for infrared transmission medium · · · · Minimum transmission word - Four words for the HT12E - One word for the HT12A Built-in oscillator needs only 5% resistor Data code has positive polarity Minimal external components HT12A/E: 18-pin DIP/20-pin SOP package · · · · Car alarm system Security system Cordless telephones Other remote control systems · Applications · · · · Burglar alarm system Smoke and fire alarm system Garage door controllers Car door controllers General Description The 212 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 12-N 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 HT12E or a DATA trigger on the HT12A further enhances the application flexibility of the 212 series of encoders. The HT12A additionally provides a 38kHz carrier for infrared systems. Selection Table Function Address Address/ Data Oscillator No. Data No. No. Part No. Trigger Package Carrier Output Negative Polarity HT12A 8 0 4 455kHz resonator D8~D11 18 DIP 20 SOP 38kHz No HT12E 8 4 0 RC oscillator TE 18 DIP 20 SOP No No Note: Address/Data represents pins that can be address or data according to the decoder requirement. 1 April 11, 2000 HT12A/HT12E Block Diagram TE trigger HT12E O S C 2 O S C 1 O s c illa to r T E A 0 1 2 T r a n s m is s io n G a te C ir c u it A 7 D a ta S e le c t & B u ffe r ¸ 3 D iv id e r D O U T S y n c . C ir c u it ¸ 1 2 C o u n te r & 1 o f 1 2 D e c o d e r B in a r y D e te c to r A D 8 A D 1 1 V D D V S S DATA trigger HT12A X 2 X 1 O s c illa to r D a ta S e le c t & B u ffe r ¸ 5 7 6 D iv id e r L /M B A 0 1 2 T r a n s m is s io n G a te C ir c u it A 7 D O U T S y n c . C ir c u it ¸ 1 2 C o u n te r & 1 o f 1 2 D e c o d e r B in a r y D e te c to r D 8 D 1 1 V D D V S S Note: The address data pins are available in various combinations (refer to the address/data table). 2 April 11, 2000 HT12A/HT12E Pin Assignment 8 -A d d re s s 4 -D a ta 8 -A d d re s s 4 -D a ta 8 -A d d re s s 4 -A d d r e s s /D a ta 8 -A d d re s s 4 -A d d r e s s /D a ta N C 1 2 0 N C N C 1 2 0 N C A 0 1 1 8 V D D A 0 2 1 9 V D D A 0 1 1 8 V D D A 0 2 1 9 V D D A 1 2 1 7 D O U T A 1 3 1 8 D O U T A 1 2 1 7 D O U T A 1 3 1 8 D O U T A 2 3 1 6 X 1 A 2 4 1 7 X 1 A 2 3 1 6 O S C 1 A 2 4 1 7 O S C 1 A 3 4 1 5 X 2 A 3 5 1 6 X 2 A 3 4 1 5 O S C 2 A 3 5 1 6 O S C 2 A 4 5 1 4 L /M B A 4 6 1 5 L /M B A 4 5 1 4 T E A 4 6 1 5 T E A 5 6 1 3 D 1 1 A 5 7 1 4 D 1 1 A 5 6 1 3 A D 1 1 A 5 7 1 4 A D 1 1 A 6 7 1 2 D 1 0 A 6 8 1 3 D 1 0 A 6 7 1 2 A D 1 0 A 6 8 1 3 A D 1 0 A 7 8 1 1 D 9 A 7 9 1 2 D 9 A 7 8 1 1 A D 9 A 7 9 1 2 A D 9 V S S 9 1 0 D 8 V S S 1 0 1 1 D 8 V S S 9 1 0 A D 8 V S S 1 0 1 1 A D 8 H T 1 2 A 2 0 S O P H T 1 2 A 1 8 D IP H T 1 2 E 1 8 D IP H T 1 2 E 2 0 S O P Pin Description Pin Name I/O Internal Connection Description CMOS IN Pull-high (HT12A) A0~A7 AD8~AD11 I I NMOS Input pins for address A0~A7 setting TRANSMISSION These pins can be externally set to VSS or left open GATE PROTECTION DIODE (HT12E) NMOS TRANSMISSION Input pins for address/data AD8~AD11 setting GATE PROTECTION These pins can be externally set to VSS or left open DIODE (HT12E) D8~D11 I CMOS IN Pull-high DOUT O CMOS OUT L/MB I CMOS IN Pull-high Input pins for data D8~D11 setting and transmission enable, active low These pins should be externally set to VSS or left open (see Note) Encoder data serial transmission output Latch/Momentary transmission format selection pin: Latch: Floating or VDD Momentary: VSS 3 April 11, 2000 HT12A/HT12E I/O Internal Connection TE I CMOS IN Pull-high OSC1 I OSCILLATOR 1 Oscillator input pin OSC2 O OSCILLATOR 1 Oscillator output pin X1 I OSCILLATOR 2 455kHz resonator oscillator input X2 O OSCILLATOR 2 455kHz resonator oscillator output VSS I ¾ Negative power supply, grounds VDD I ¾ Positive power supply Pin Name Description Transmission enable, active low (see Note) Note: D8~D11 are all data input and transmission enable pins of the HT12A. TE is a transmission enable pin of the HT12E. Approximate internal connections N M O S 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 1 E N O S C 1 O S C IL L A T O R X 1 O S C 2 N M O S T R A N S M IS S IO N G A T E P R O T E C T IO N D IO D E 2 X 2 V D D Absolute Maximum Ratings Supply Voltage (HT12A) ..............-0.3V to 5.5V Supply Voltage (HT12E) ...............-0.3V to 13V Input Voltage....................VSS-0.3 to VDD+0.3V Storage Temperature.................-50°C to 125°C 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. 4 April 11, 2000 HT12A/HT12E Electrical Characteristics Ta=25°C HT12A Symbol Parameter Test Conditions Min. Typ. Max. Unit 2.4 3 5 V ¾ 0.1 1 mA ¾ 0.1 1 mA No load fOSC=455kHz ¾ 200 400 mA ¾ 400 800 mA VOH=0.9VDD (Source) -1 -1.6 ¾ mA VOL=0.1VDD (Sink) 2 3.2 ¾ mA VDD Conditions ¾ ¾ VDD Operating Voltage ISTB Standby Current IDD Operating Current IDOUT Output Drive Current 5V VIH ²H² Input Voltage ¾ ¾ 0.8VDD ¾ VDD V VIL ²L² Input Voltage ¾ ¾ 0 ¾ 0.2VDD V RDATA D8~D11 Pull-high Resistance 5V ¾ 150 300 kW 3V 5V 3V 5V Oscillator stops VDATA=0V Ta=25°C HT12E Symbol Parameter Test Conditions Min. Typ. Max. Unit 2.4 5 12 V ¾ 0.1 1 mA ¾ 2 4 mA ¾ 40 80 mA ¾ 150 300 mA VOH=0.9VDD (Source) -1 -1.6 ¾ mA VOL=0.1VDD (Sink) 1 1.6 ¾ mA VDD Conditions ¾ ¾ VDD Operating Voltage ISTB Standby Current IDD Operating Current No load 12V fOSC=3kHz IDOUT Output Drive Current 5V VIH ²H² Input Voltage ¾ ¾ 0.8VDD ¾ VDD V VIL ²L² Input Voltage ¾ ¾ 0 ¾ 0.2VDD V fOSC Oscillator Frequency 5V ROSC=1.1MW ¾ 3 ¾ kHz RTE TE Pull-high Resistance 5V VTE=0V ¾ 1.5 3 MW 3V 12V Oscillator stops 3V 5 April 11, 2000 HT12A/HT12E Functional Description Operation The 212 series of encoders begin a 4-word transmission cycle upon receipt of a transmission enable (TE for the HT12E or D8~D11 for the HT12A, active low). This cycle will repeat itself as long as the transmission enable (TE or D8~D11) is held low. Once the transmission enable returns high the encoder output completes its final cycle and then stops as shown below. T E < 1 w o rd E n c o d e r D O U T T r a n s m itte d C o n tin u o u s ly 4 w o rd s 4 w o rd s Transmission timing for the HT12E D 8 ~ D 1 1 K e y - in < 1 w o rd E n c o d e r D O U T w ith 3 8 k H z c a r r ie r T r a n s m itte d C o n tin u o u s ly 1 w o rd 1 w o rd Transmission timing for the HT12A (L/MB=Floating or VDD) D 8 ~ D 1 1 K e y - in ( a ll d a ta = 1 ) 7 w o rd s < 1 w o rd E n c o d e r D O U T T r a n s m itte d C o n tin u o u s ly 7 w o rd s 1 w o rd ( a ll d a ta = 1 ) 1 w o rd Transmission timing for the HT12A (L/MB=VSS) 6 April 11, 2000 HT12A/HT12E Information word If L/MB=1 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/MB=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 ²1² data code. An information word consists of 4 periods as illustrated below. 1 /3 b it s y n c . p e r io d a d d r e s s c o d e p e r io d p ilo t p e r io d ( 1 2 b its ) d a ta c o d e p e r io d Composition of information Address/data waveform Each programmable address/data pin can be externally set to one of the following two logic states as shown below. fO S C "O n e " "Z e ro " A d d re s s / D a ta B it Address/Data bit waveform for the HT12E fO S C 3 8 k H z c a r r ie r "O n e " D a ta B it "Z e ro " D a ta B it "O n e " A d d r e s s B it "Z e ro " A d d r e s s B it Address/Data bit waveform for the HT12A 7 April 11, 2000 HT12A/HT12E The address/data bits of the HT12A 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 ²high² or ²low². If a transmission-enable signal is applied, the encoder scans and transmits the status of the 12 bits of address/data serially in the order A0 to AD11 for the HT12E encoder and A0 to D11 for the HT12A 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 1mA 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 HT12E: O S C 1 O S C 2 T r a n s m is s io n m e d iu m D O U T V D D V A 0 A 1 A 2 A 3 A 4 A 5 A 6 A 7 V S S T E A D 8 A D 9 A D 1 0 A D 1 1 D D V S S The transmitted information is as shown: Pilot & Sync. A0 A1 A2 A3 A4 A5 A6 A7 AD8 AD9 1 0 1 0 0 0 1 1 1 1 8 AD10 AD11 1 0 April 11, 2000 HT12A/HT12E Address/Data sequence The following provides the address/data sequence table for various models of the 212 series of encoders. The correct device should be selected according to the individual address and data requirements. Part No. Address/Data Bits 0 1 2 3 4 5 6 7 8 9 10 11 HT12A A0 A1 A2 A3 A4 A5 A6 A7 D8 D9 D10 D11 HT12E A0 A1 A2 A3 A4 A5 A6 A7 AD8 AD9 AD10 AD11 Transmission enable For the HT12E encoders, transmission is enabled by applying a low signal to the TE pin. For the HT12A encoders, transmission is enabled by applying a low signal to one of the data pins D8~D11. Two erroneous HT12E application circuits The HT12E must follow closely the application circuits provided by Holtek (see the ²Application circuits²). · Error: AD8~AD11 pins input voltage > VDD+0.3V O S C 2 V D D O S C 1 A D 1 1 T E A D 1 0 A D 9 V S S A D 8 1 2 V H T 1 2 E 9 April 11, 2000 HT12A/HT12E · Error: The IC¢s power source is activated by pins AD8~AD11 1 2 V O S C 2 V D D O S C 1 A D 1 1 T E A D 1 0 A D 9 V S S A D 8 H T 1 2 E Flowchart · HT12A · HT12E N o P o w e r o n P o w e r o n S ta n d b y m o d e S ta n d b y m o d e N o D a ta e n a b le ? Y e s T r a n s m is s io n e n a b le d ? Y e s 4 d a ta w o rd s tr a n s m itte d D a ta w ith c a r r ie r s e r ia l o u tp u t D a ta s till e n a b le d ? Y e s N o N o L /M B = G N D ? T r a n s m is s io n s till e n a b le d Y e s 4 d a ta w o rd s tr a n s m itte d c o n tin u o u s ly Y e s N o S e n d th e la s t c o d e S e n d ² 1 ² 7 tim e s fo r a ll o f th e d a ta c o d e s Note: D8~D11 are transmission enables of the HT12A. TE is the transmission enable of the HT12E. 10 April 11, 2000 HT12A/HT12E Oscillator frequency vs supply voltage fO S C (S c a le ) R (W ) O S C 7 .0 0 4 7 0 k 5 1 0 k 6 .0 0 5 6 0 k 6 2 0 k 5 .0 0 6 8 0 k 7 5 0 k 4 .0 0 8 2 0 k 9 1 0 k 1 .0 M (3 k H z )3 .0 0 1 .2 M 1 .5 M 2 .0 0 2 .0 M 1 .0 0 2 3 4 5 6 7 8 9 1 0 1 1 1 2 1 3 V D D (V D C ) The recommended oscillator frequency is fOSCD (decoder) @ 50 fOSCE (HT12E encoder) 1 @ fOSCE (HT12A encoder) 3 11 April 11, 2000 HT12A/HT12E Application Circuits V 1 2 3 4 5 6 7 8 9 A 0 V D D A 1 D O U T A 2 X 1 A 3 X 2 A 4 L /M B A 5 D 1 1 A 6 D 1 0 A 7 D 9 V S S D 8 1 0 0 W D D T r a n s m itte r C ir c u it V 1 8 1 A 0 V D D 1 8 2 A 1 D O U T 1 7 3 A 2 O S C 1 1 6 4 A 3 O S C 2 1 5 1 4 5 A 4 T E 1 4 1 3 6 A 5 A D 1 1 1 3 1 2 7 A 6 A D 1 0 1 2 1 1 8 A 7 A D 9 1 1 1 0 9 V S S A D 8 1 7 1 0 k W 1 6 4 5 5 k W 1 5 8 0 5 0 1 0 0 p F 1 0 M W 1 0 0 p F H T 1 2 A R D D O S C 1 0 H T 1 2 E Note: Typical infrared diode: EL-1L2 (KODENSHI CORP.) Typical RF transmitter: JR-220 (JUWA CORP.) 12 April 11, 2000 HT12A/HT12E 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) 5F, 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 Copyright Ó 2000 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. 13 April 11, 2000