ST12 CODEC IR/RF Remote Control Encoder/Decoder IC 1. Overview

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Roland Thornton
6 years ago
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1 ST CODEC / Remote Control Encoder/Decoder IC. Overview ST CODEC is Radio Frequency and Infrared encoder/decoder IC for remote control applications having unique features and flexibility not available with other remote control encoder decoder ICs. ST is truly a single-chip remote control solution. PIN DIP Transmitter and Receiver can operate over Radio Frequency or Infrared having four address and eight data bits. Transmission and Reception over Infrared is achieved by commonly available Infrared LED- Detector and for any general purpose Transmitter-Receiver pair would suffice. A0 A A A MODE - LATCH - MOM DATA RX - TX ENC-DEC The ST combines the functionality of both encoder and decoder in a single package with several unique features for enhanced operation and a reduced component count for transmitter and receiver circuits. The ENC-DEC pin configures the ST IC for encode or decode operation automatically at powerup.. Features Encode / Decode on single chip Built in Oscillator Minimum External Components Wide operating voltage range. (.0 -.V) Single chip Encoding Decoding Mode 0kHz carrier for infrared transmission medium pin DIP 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 D D D 0 D

2 Page of. Pin Definitions Pin Number Description - A0-A - bit Address Input Ground - - bit Data input if configured as Encoder - bit Data output if configured as Decoder - +V DC ENC-DEC Configure chip as Encoder or Decoder Encoder if pin is tied to Decoder if pin is tied to DATA RX-TX Transmit data or Receive Data from this pin through / Interface LATCH-MOM Applicable in Decoder Mode Latching output (Toggle Output) if pin is tied to Momentary output if pin is tied to In encoder mode tie this pin to or and do not leave it floating Mode / Selects Transmit / Receive by Infrared or Radio Frequency Mode if pin is tied to Mode if pin is tied to Encoder sends 0khz Modulation signal in Mode for driving LED Decoder inverts received data in Mode. Encoder When configured as Encoder the chip will transmit signal containing bit Address A0-A and bit of Data - from its DATA RX-TX pin. Removing ground from a data input will end the transmission. Infrared transmission will include data modulated for 0 khz frequency for driving Infrared LED. Radio Frequency Transmission mode will transmit data in bi-phase Manchester encoding... Latching Key-Press With the decoder in latch mode, data inputs - of the encoder must be pressed & released one at a time to toggle decoder outputs on or off individually. Multiple key presses are not allowed on the encoder when the decoder is configured for latch mode... Momentary Key-Press In momentary mode, any combination of the encoder data inputs - may be grounded simultaneously.. Decoder Decoder outputs can sink or source up to ma per pin with a total combined device package maximum of 00mA allowing direct remote control of LED s, solid-state relays, and other logic devices without the need for secondary driver circuits. 00 Sunrom Technologies

3 Page of. Data & Address Validation Encoder address pins A0-A must be set to the same logic levels as decoder address pins A0-A. If these do not match, the decoder will ignore data sent from the encoder. The decoder receives two consecutive & matching data/address packets before transferring data to the - outputs. Each -bit packet transmit time requires approximately ms. Care should be taken not to violate these timing requirements when the ST is controlled by high-speed logic circuits or embedded controllers such as the PIC, BASIC Stamp or 0. Important: Address input pins A0-A & configuration selection input must always be connected to Vdd or circuit ground depending on the mode required. Allowing any of these input pins to float (leaving them un-connected) will cause erratic results.. Transmitter Application Schematic (Encoder) U ST CODEC A LATCH - MOM A DATA RX - TX A ENC - DEC D D 0 D D C 00n J JUMPERP R K Q BC D LED Q BC E ANTENNA U STT- CN SIP V Battery D N00 U LML0 IN OUT C 00n C 00n R 0K ANT DATA C 00n Sunrom Technologies Title Channel Remote Transmitter Code 00- Rev Date: Monday, May 0, 00 Sheet of 00 Sunrom Technologies

4 Page of.. Receiver Application Schematic (Decoder) E ANTENNA U STR- RECEIVER U TSOP ANT (V) (V) ANALOG DATA R 0R Vcc Gnd Out C 00n C 0uF V OUT OUT OUT OUT U ST CODEC A LATCH - MOM A DATA RX - TX A ENC - DEC D D 0 D D OUT OUT OUT OUT C 00n J JUMPERP LATCH J JUMPERP MOMENTARY Power Supply CN DC SOCKET V Input D D R K D LED VDD C 00n U L0/TO IN OUT + C 00uF V C 00uF V + C 00n D. Related Information Infrared version of channel Remote Control o Infrared LED o Infrared Detector TSOP version of channel Remote Control o MHz Transmitter STT- o MHz Receiver STR Sunrom Technologies

5 0. Electrical Specifications Paramater Maximum Input/Output Sink/Source Current On Any Pin Maximum Input/Output Sink/Source Current Total Operating Voltage Avg. No Load Operating Current Page of Value ma 00mA.0-.0V DC Carrier Frequency / Duty Cycle +/- % 0kHz / 0% 0.. Chip Description The ST CODEC is available in a pin DIP package (0. width). It uses a supply voltage of v DC. Outputs and inputs are TTL and CMOS compatible. ST CODEC A LATCH - MOM A DATA RX - TX A ENC - DEC D D 0 D D 0.. Ordering Information Part Number Description ST CODEC - / Remote Control Encoder/Decoder I.C. 00 Sunrom Technologies

4 Channel RF Remote Controller with Momentary Outputs

4 Channel RF Remote Controller with Momentary Outputs 4 Channel RF remote built using PT2262 and PT2272 IC from Princeton technology. PT2262 used as Encoder (Transmitter) and PT2262 Decoder (Receiver)