 |
|
| If you can't view the Datasheet, Please click here to try to view without PDF Reader . |
|
|
|
| If you can't view the Datasheet, Please click here to try to view without PDF Reader . |
|
|
| Datasheet File OCR Text: |
| Holtek HT640/S Data Sheet WIRELESS MADE SIMPLE FEATURES * Operating voltage: 2.4V~12V * Low power and high noise immunity CMOS technology * Low standby current * Capable of decoding 18 bits of information * Pairs with HOLTEK's HT640 encoder * 10 address pins * 8 data pins * Trinary address setting * Two times of receiving check * Built-in oscillator needs only a 5% resistor * Valid transmission indictor * Easily interface with an RF or an infrared transmission medium * Minimal external components 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 HT640/S encoder is a CMOS LSI for remote control system applications. It is paired with the HT658/S decoder. The HT640 encoder is capable of encoding 18 bits of information, which consists of 10 address bits and 8 data bits. 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 on the TE line. Note: This product is manufactured and supported by Holtek Semiconductor. This data sheet is provided as a courtesy to Linx customers and is believed to be accurate at the time of publication, however these specifications may change at any time without notice. Linx Technologies makes no representation as to the accuracy or suitability of this information for any purpose. For more information please contact Holtek at www.holtek.com. Holtek HT640/S Data Sheet PIN OUT D1 D2 D3 D4 D5 D6 D7 DOUT TE OSC2 OSC1 VSS 1 2 3 4 5 6 7 8 9 10 11 12 24 23 22 21 20 19 18 17 16 15 14 13 VDD D0 A9 A8 A7 A6 A5 A4 A3 A2 A1 A0 Page 2 PIN DESCRIPTIONS Pin Name A0-A11 D0-D7 DOUT TE OSC1 OSC2 VSS VDD I/O I I O I I O I I Internal Connection TRANSMISSION GATE TRANSMISSION GATE CMOS OUT CMOS In Pull-low OSCILLATOR OSCILLATOR Description Input pins for address A0-A9 setting They can be externally set to VDD, VSS, or left open. Input pins for data (D0-D7) setting They can be externally set to VDD, VSS, or left open. Encoder data serial transmission output Transmission enable, active high Oscillator input pin Oscillator output pin Negative power supply (GND) Positive power supply APPROXIMATE INTERNAL CIRCUITS TRANSMISSION GATE CMOS OUT CMOS IN Pull Low EN OSC1 OSCILLATOR OSC2 Holtek HT640/S Data Sheet ABSOLUTE MAXIMUM RATINGS* Supply Voltage .............. -0.3V to 13V Input Voltage..................VSS-0.3V to VDD+0.3V Page 3 Storage Temperature................. -50C to 125C Operating Temperature............... -20C to 75C *Note: Stresses above those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only. Functional operation of this device at these or any other conditions above those indicated in the operational sections of this specification is not implied and exposure to absolute maximum rating conditions for extened periods may affect device reliability. ELECTRICAL CHARACTERISTICS Symbol V DD I STB Parameter Operating Voltage 3V Standby Current 12V 5V Operating Current 12V 5V Output Drive Current 5V H Input Voltage L Input Voltage Oscillator Frequency TE Pull-low Resistance 10V 5V ROSC=330k V TE =5V No load f OSC=100kHz V OH =0.9V DD (Source) V OL =0.1V DD (Sink) 0.6 0.6 0.8V DD 0 100 1.5 3 Oscillator stops 2 250 1200 1.2 1.2 VDD 0.2V DD 4 500 2400 Test Conditions V DD Conditions Min. 2.4 0.1 T yp. Max. 12 1 Unit V A A A A mA mA V V kHz M I DD I DOUT V IH V IL f OSC RTE ENCODER OSCILLATOR FREQUENCY VS SUPPLY VOLTAGE 300 275 250 225 200 175 Fosc (kHz) 150 125 100 75 50 25 2 3 4 5 6 7 8 9 10 11 180k 220k 270k 330k 390k 470k 560k 680k 820k 1M 1.5M 2M 12 12.5 VDD (VDC) 150k Rosc (ohms) 120k Holtek HT640/S Data Sheet FUNCTIONAL DESCRIPTION The HT640/S encoder begins a three-word transmission cycle when the transmission enable line (TE) is pulled high. This cycle will repeat itself as long as the TE line is held high. Once TE falls low, the encoder output completes its final cycle and then stops as shown in the Encoder/Decoder Timing diagram. When 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 A9, D0 to D7. The status of each address/data pin can be individually preset to logic high, low, or floating. The floating state data input is interpreted as logic low by the decoders since the decoder output only has two states. The address pins are usually set to transmit particular security codes by DIP switches or PCB wiring, while the data is selected using push buttons or electronic switches. The floating state allows the HT640/S to be used without pull-up or pull-down resistors on the data and address input lines. Power On Page 4 Standby Mode No Transmission Enabled? Yes 3 Data Words Transmitted Transmission Still Enabled? 3 Data Words Transmitted Continuously DATA STRUCTURE 1/6 bit Pilot Period (6 bits) Sync. Period Address Code Period Data Code Period BLOCK DIAGRAM OSC2 OSC1 Oscillator TE A0 18 Transmission Gate Circuit A9 +33 Divider Data Select & Buffer DOUT +18 Counter & 1 of 18 Decoder Sync. Circuit Trinary Detector D0 D7 VDD VSS Holtek HT640/S Data Sheet ENCODER/DECODER TIMING Encoder Transmit Enable Encoder Data Out 3 Words 2 Words Check Check Page 5 < 1 Word Transmitted Continuously 214 Clocks 3 Words 214 Clocks Decoder VT Decoder Data Out 1/2 Clock Time 1/2 Clock Time ENCODER/DECODER DATA STRUCTURE SYNC BITS ADDRESS BITS DATA BITS A&D BITS PULLED TO VCC A&D BITS OPEN A&D Bits PULLED TO GND SYNC PERIOD SYNC BITS A0 A1 A2 A3 A4 A5 A6 A7 A8 A9 D0 D1 D2 D3 D4 D5 D6 D7 15.1mS 5.6mS 26mS TIME DEPENDANT ON OSCILLATOR RESISTOR CHOSEN (390k) 21mS 22.30% 8.27% 38.40% PERCENTAGES OF TOTAL TIME FOR ONE WORD PLUS SYNC 31.02% Bit Pattern Interpretation fosc/33 "One" "Zero" "Open" Holtek HT640/S Data Sheet SOP-24 PACKAGE DIMENSIONS Page 6 0.038 (0.965) 0.012 (0.305) 0.419 (10.643) 0.300 (7.620) 10 0.614 (15.596) 0.104 (2.642) 0.020 (0.508) 0.050 typ. (1.27) 0.004 min. (0.102) APPLICATION CIRCUIT VCC VCC 1 D1 D2 VCC D0 A9 A8 A7 A6 A5 A4 A3 A2 A1 A0 24 23 22 21 20 19 18 17 16 15 14 13 GND 4 5 390k TE OSC2 11 OSC1 12 GND HT_640/S GND GND 1 2 GND GND 3 4 GND DATA_IN GND IADJ/GND TXM-xxx-LC 8 9 D5 D6 D7 GND VCC GND RF_OUT 8 7 6 5 GND ANTENNA VCC GND |
Price & Availability of HT640-S
 |
|
|
|
|
All Rights Reserved © IC-ON-LINE 2003 - 2022 |
| [Add Bookmark] [Contact Us] [Link exchange] [Privacy policy] |
|
Mirror Sites : [www.datasheet.hk]
[www.maxim4u.com] [www.ic-on-line.cn]
[www.ic-on-line.com] [www.ic-on-line.net]
[www.alldatasheet.com.cn]
[www.gdcy.com]
[www.gdcy.net] |