315 Series of Encoders/Decoders Features * * * * * * * * * * Operating voltage: 2.4V~12V Low power and high noise immunity CMOS technology Low standby current 315 address codes Built-in oscillator needs only 5% resistor Three times transmission * Check received address twice Valid transmission indicator 1 momentary, 1 toggled data output Easily interface with an RF or an infrared transmission medium Minimal external components * * * * 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 315 encoder/decoder are a series of CMOS LSIs for remote control system applications. The encoder section encodes 15 bits of address and serially transmits the encoded data upon receipt of a Transmit Enable (TE) signal. The decoder section, on the other hand, receives the 15-bit word and interprets all the 15 bits as address. If the encoder sends an address that matches the address of the decoder, the VT pin goes high on the decoder and the the TGO pin toggles once simultaneously. When the STATUS pin is high, the device is in the process of encoding. Otherwise, it is in the standby state or in the decoding condition. Package Information 1 2nd Oct '97 315 Series of Encoders/Decoders Block Diagram Pin Description (28 DIP) Pin Name I/O Internal Connection Description TRANSMISSION Input pins for address A0~A14 setting GATE They can be externally set to VDD, VSS, or left open. A0~A14 I STATUS O CMOS OUT RESET I CMOS IN Pull-Low Decoder reset pin for clearing TGO DIN I CMOS IN Decoder data serial input DOUT O CMOS OUT Encoder data serial transmission output VT O CMOS OUT Valid transmission indicator output, active high TGO O CMOS OUT Toggle output for the decoder TE I CMOS IN Pull-Low OSC1 I OSCILLATOR Oscillator input pin OSC2 O OSCILLATOR Oscillator output pin VSS I -- Negative power supply (GND) VDD I -- Positive power supply Encoder enable indicator, active high Transmission enable, active high 2 2nd Oct '97 315 Series of Encoders/Decoders Approximate internal connection circuits Absolute Maximum Ratings* Supply Voltage ............................... -0.3V to 13V Storage Temperature................. -50C to 125C Input Voltage.................... VSS-0.3 to VDD+0.3V 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. (Ta=25C) Electrical Characteristics Symbol Test Conditions Parameter Min. Typ. Max. Unit 2.4 -- 12 V -- 0.1 1 A 12V -- 2 4 A 5V -- 250 500 A -- 600 1200 A VDD Conditions -- -- VDD Operating Voltage ISTB Standby Current IDD Operating Current Output Drive Current for DOUT, STATUS, VT, TGO Pins 5V IOUT VOH=0.9VDD (Source) -0.6 5V VOL=0.1VDD (Sink) "H" Input Voltage -- VIH 3V Oscillator stops No load 12V FOSC=100kHz -- 3 -1.2 mA -- 2 4 -- mA 0.8VDD -- VDD V 2nd Oct '97 315 Series of Encoders/Decoders Symbol Test Conditions Parameter VDD Conditions -- -- Min. Typ. Max. Unit 0 -- 0.2VDD V VIL "L" Input Voltage FOSC Oscillator Frequency 10V ROSC=390k -- 100 -- kHz RTE TE Pull-Low Resistance 5V -- 1.5 3 M VTE=5V Functional Description Encoder section operation The 315 series of encoder begin a three-word transmission cycle upon receipt of a transmission enable (TE, active high). This cycle will repeat itself as long as the transmission enable (TE) is held high. Once the transmission enable falls low the encoder output completes its final cycle and then stops as shown below. Transmission timing Encoder section information word An information word is composed of three periods as shown: The 315 series of encoder detects the logic state of address (A0~A14) and transmits the detected data during the address code period. Each address pin can be set to one of the following three logic states: 4 2nd Oct '97 315 Series of Encoders/Decoders Encoder flowchart Decoder section operation A signal on the DIN pin activates the oscillator which in turn decodes the incoming address. The decoder then checks the received address twice continuously. If all the received address codes match the contents of the decoder's local address, the TGO pin toggles once and the VT pin is set high to indicate a valid transmission. That will last until the address code is incorrect or no signal has been received. The output of the VT pin is high only when the transmission is valid. Otherwise it is always low. The output of the TGO pin can be cleared low by a RESET signal (active high). Decoder flowchart Note: The oscillator is disabled in the standby state and activated as long as a logic "high" signal is applied to the DIN pin. i.e., DIN should be kept "low" if there is no signal input. 5 2nd Oct '97 315 Series of Encoders/Decoders Decoder timing Oscillator frequency vs supply voltage The recommended oscillator frequency is FOSCD (HT6150 decoder) FOSCE (HT6150 encoder). 6 2nd Oct '97 315 Series of Encoders/Decoders Application Circuits Note: Typical infrared diode: EL-1L2 (KODENSHI CORP.) Typical RF transmitter: JR-220 (JUWA CORP.) Typical infrared receiver: PIC-12043T/PIC-12043S (KODESHI CORP.) or LTM9052 (LITEON CORP.) Typical RF receiver: JR-200 (JUWA CORP.) 7 2nd Oct '97