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HT600/680/6207 318 Series of Encoders
Features
* * * * *
Operating voltage: 2.4V~12V Low power and high noise immunity CMOS technology Low standby current Three words transmission Built-in oscillator needs only 5% resistor
* * *
Easy interface with an RF or infrared transmission media Minimal external components Package information: refer to Selection Table
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 318 encoders are a series of CMOS LSIs for remote control system applications. They are capable of encoding 18 bits of information which consists of N address bits and 18-N data bits. Each address/data input is externally trinary programmable if bonded out. It is otherwise set floating internally. Various packages of the 318 encoders offer flexible combinations of programmable address/data to meet various application needs. The programmable address/data is 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 type or a DATA trigger type further enhances the application flexibility of the 318 series of encoders.
Selection Table
Function Address Address/ No. Data No. Part No. HT600 HT680 HT6207 9 8 10 5 4 0 Data No. 0 0 4 Dummy Code No. 4 6 4 Oscillator RC oscillator RC oscillator RC oscillator Trigger TE TE D12~D15 Package 20 DIP/SOP 18 DIP/SOP 20 DIP/SOP
Note: Address/Data represents addressable pins or data according to the decoder requirements.
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Block Diagram
TE trigger HT600/HT680
OSC2 OSC1
O s c illa to r TE A0 18 T r a n s m is s io n G a te C ir c u it A9
3 3 D iv id e r
D a ta S e le c t & B u ffe r
DOUT
1 8 C o u n te r & 1 of18 D ecoder
S ync. C ir c u it
T r in a r y D e te c to r
AD 10
AD 17
VDD
VSS
DATA trigger HT6207
OSC2 OSC1
O s c illa to r
3 3 D iv id e r
D a ta S e le c t & B u ffe r
DOUT
A0 18 T r a n s m is s io n G a te C ir c u it A11
1 8 C o u n te r & 1 of18 D ecoder
S ync. C ir c u it
T r in a r y D e te c to r
LED
C ir c u it
LED
D12
D17
VDD
VSS
Note: The address/data pins are available in various combinations.
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Pin Assignment
T E tr ig g e r ty p e 9 -A d d re s s 5 -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
DATA tr ig g e r ty p e
1 0 -A d d re s s 4 -D a ta
AD 11 AD 12 AD 13 AD 14 4 5 6 7 8 9 AD 15 DOUT TE OSC2 OSC1 VSS 3 2
1
20 19 18 17 16 15 14 13 12 10 11
VDD A9 A8 A7 A6 A4 A3 A2 A1 A0 AD 11 AD 12 2 3 4 5 6 7 8 9 AD 14 AD 15 DOUT TE OSC2 OSC1 VSS 1 18 17 16 15 14 13 12 11 10 VDD A9 A8 A7 A6 A3 A2 A1 A0
A11 1 2 3 4 5 6 7 8 9 D12 D13 D14 D15 DOUT LED OSC2 OSC1 VSS
20 19 18 17 16 15 14 13 12 10 11
VDD A9 A8 A7 A6 A4 A3 A2 A1 A0
H T600 2 0 D IP /S O P
H T680 1 8 D IP /S O P
HT6207 2 0 D IP /S O P
Pin Description
Pin Name A0~A11 AD10~AD17 D12~D15 DOUT LED TE OSC1 OSC2 VSS VDD I/O I I I O O I I O 3/4 3/4 Internal Connection Description
TRANSMISSION Input pins for address A0~A11 setting GATE They can be externally set to VDD, VSS, or left open. TRANSMISSION Input pins for address/data (AD10~AD17) setting GATE They can be externally set to VDD, VSS, or left open. CMOS IN Pull-low CMOS OUT NMOS OUT CMOS IN Pull-low OSCILLATOR OSCILLATOR 3/4 3/4 Input pins for data (D12~D15) setting and transmission enable (active high) They an be externally set to VDD or left open (see Note). Encoder data serial transmission output LED transmission enable indicator Transmission enable, active high (see Note). Oscillator input pin Oscillator output pin Negative power supply, ground Positive power supply
Note: D12~D15 are data input and transmission enable pins of the HT6207. TE is the transmission enable pin of the HT600/HT680.
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Approximate internal connections
T R A N S M IS S IO N GATE C M O S IN P u ll- lo w CMOS OUT NMOS OUT
O S C IL L A T O R
EN OSC1
OSC2
Absolute Maximum Ratings
Supply Voltage...............................-0.3V to 13V Input Voltage....................VSS-0.3 to VDD+0.3V Storage Temperature.................-50C to 125C Operating Temperature ..............-20C to 75C
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.
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Electrical Characteristics
Symbol VDD ISTB IDD ILED IDOUT VIH VIL fOSC RTE RDATA Parameter Operating Voltage Standby Current Operating Current LED Sink Current Output Drive Current H Input Voltage L Input Voltage Oscillator Frequency TE Pull-low Resistance D12~D17 Pull-low Resistance Test Conditions VDD 3/4 3V 12V 5V 12V 5V 5V 5V 3/4 3/4 10V 5V 5V VTE=5V VDATA=5V Conditions 3/4 Oscillator stops No load fOSC=100kHz VLED=0.5V VOH=0.9VDD (Source) VOL=0.1VDD (Sink) 3/4 3/4 ROSC=330kW Min. 2.4 3/4 3/4 3/4 3/4 1.5 -0.6 0.6 0.8VDD 0 3/4 3/4 3/4 Typ. 3/4 0.1 2 250 1200 3 -1.2 1.2 3/4 3/4 100 1.5 1.5 Max. 12 1 4 500 2400 3/4 3/4 3/4 VDD 0.2VDD 3/4 3 3 Ta=25C Unit V mA mA mA mA mA mA mA V V kHz MW MW
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Functional Description
Operation The 318 series of encoders begins a three-word transmission cycle upon receipt of a transmission enable (TE for the HT600/HT680 or D12~D15 for the HT6207, active high). This cycle will repeat itself as long as the transmission enable (TE or D12~D15) is held high. Once the transmission enable falls low, the encoder output completes its final cycle and then stops as shown below.
TE or D12~D15 < 1 w o rd E ncoder D a ta O u t 3 w o rd s T r a n s m itte d C o n tin u o u s ly 3 w o rd s
Transmission timing Information word An information word consists of four periods as shown:
1 /6 b it P ilo t p e r io d ( 6 b its ) 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 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 three logic states:
fo s c 3 3 "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 The Open state data input is interpreted as logic low by the decoders since the decoder output only have two states.
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Address/data programming (preset) The status of each address/data pin can be individually preset to logic high, low, or floating. If a transmission enable signal is applied, the encoder scans and transmits the status of the 18 bits of address/data serially in the order A0 to AD17 for the HT600/HT680 and A0 to D15 for the HT6207. There are some packaging limitations. For example t he 18-pin DIP HT680, offers four external data bits and eight external address bits. The remaining unpackaged bits or dummy codes are treated as floating for A0~AD17 or as pull-low for D12~D15. During an information transmission these bits are still located in their original position. But if the trigger signal is not applied, the chip only consumes a standby current which is less than 1mA. The address pins are usually preset to transmit data codes with particular security codes by the DIP switches or PCB wiring, while the data is selected using push buttons or electronic switches. The following figure shows an application using the HT680:
OSC1
OSC2 DOUT
T r a n s m is s io n m e d iu m
VSS
A0
A1
A2
A3
A6
A7
A8
A9
VDD
TE
AD 11AD 12 AD 14 AD 15
V
DD
The transmitted information is as shown: Pilot & Sync. 3/4 Z: floating A0 0 A1 Z A2 0 A3 1 A4 Z A5 Z A6 1 A7 Z A8 0 A9 0 AD10 AD11 Z Z
AD12 AD13 AD14 AD15 AD16 AD17 Z Z Z 1 Z Z
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Address/Data sequence The following provides a table of address/data sequence for various models of the 318 series encoders. A correct device should be selected according to the individual address and data requirementss. Part No. HT600 HT680 HT6207 Address/Data Bits 0~3 A0~A3 4 3/4 5 3/4 3/4 3/4 6~9 A6~A9 A6~A9 A6~A9 10 3/4 3/4 3/4 11 12 13 3/4 D13 14 15 16 3/4 3/4 17 3/4 3/4 A0~A3 A4 A0~A3 A4 AD11 AD12 AD13 AD14 AD15 AD11 AD12 A11 D12 AD14 AD15 D14 D15
Note: 3/4 is a dummy code which is left open and not bonded out. is a dummy code which is set low and not bonded out.
Transmission enable For the TE trigger type of encoders, transmission is enabled by applying a high signal to the TE pin. But for the Data trigger type of encoders, it is enabled by applying a high signal to one of the data pins D12~D15. Flowchart
Pow eron
S ta n d b y m o d e
No
T r a n s m is s io n e n a b le d ? Yes 3 d a ta w o rd s tr a n s m itte d
No
T r a n s m is s io n s till e n a b le d ? Yes 3 d a ta w o rd s tr a n s m itte d c o n tin u o u s ly
Note: D12~D15 are transmission enables of the HT6207. TE is the transmission enable of the HT600/HT680.
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Oscillator frequency vs supply voltage
fo s c (S c a le ) 3 .0 0 2 .7 5 2 .5 0 2 .2 5 2 .0 0 1 .7 5 1 .5 0 1 .2 5 (1 0 0 k H z ) 1 .0 0 0 .7 5 0 .5 0 0 .2 5 2 3 4 5 6 7 8 9 10 11 12 180k 220k 270k 330k 390k 470k 560k 680k 820k 1M 1 .5 M 2M 1 2 .5 V
DD
R o s c (W )
120k
150k
(V D C )
The recommended oscillator frequency is fOSCD (decoder) @ fOSCE (encoder)
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Application Circuits
T r a n s m itte r C ir c u it V
DD
T r a n s m itte r C ir c u it V 1 2 3 4 5 6 7 8 R osc 9 10
DD
1 2 3 4 5 6 7 R osc 8 9
AD11 AD12 AD14 AD15 DOUT TE OSC2 OSC1 VSS
VDD A9 A8 A7 A6 A3 A2 A1 A0
18 17 16 15 14 13 12 11 10
AD11 AD12 AD13 AD14 AD15 DOUT TE OSC2 OSC1 VSS
VDD A9 A8 A7 A6 A4 A3 A2 A1 A0
20 19 18 17 16 15 14 13 12 11
H T680
H T600
T r a n s m itte r C ir c u it V 1 2 3 4 5 6 1kW 7 8 R osc 9 10 20 19 18 17 16 15 14 13 12 11
DD
A11 D12 D13 D14 D15 DOUT LED OSC2 OSC1 VSS
VDD A9 A8 A7 A6 A4 A3 A2 A1 A0
H T6207
Note: Typical infrared diode: EL-1L2 (KODENSHI CORP.) Typical RF transmitter: JR-220 (JUWA CORP.) TX-99 (MING MICROSYSTEM, U.S.A.)
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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 a 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.
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