3
15
Series of Enco ders/Decoders
Package Information
General Description
The 315 encoder/decoder are a series of CMOS
LSIs for remote control system applications.
The encode r section encodes 15 bits of addres s
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 addre ss o f the d ecod er, the VT pi n
goes high on the decoder and the the TGO pin
toggles once simultaneously. When the
ST A TUS pin is high, the device is in the process
of encoding. Otherwise, it is in the standby state
or in the decoding condition.
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
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 sys tems
1 2nd Oct ’97
Block Diagram
Pin Description
(28 DIP)
Pin Name I/O Internal
Connection Description
A0~A14 I TRANSMISSION
GATE Input pins for address A0~A14 setting
They can be externally set to VDD, VSS, or left open .
ST ATUS O CMOS OUT Encoder enable indicator, active high
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 Transmission enable, active high
OSC1 I OSCILLATOR Oscillator input pin
OSC2 O OSCILLATOR Oscillator output pin
VSS I — Negative power supply (GND)
VDD I — Positive power supply
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Approx i mat e i nte r na l co nn ec t ion circu i t s
Absolute Maximum Ratings*
Supply Voltage ...............................–0.3V to 13V Storage Temperature........... .... ..–50°C to 125°C
Input Voltage....................VSS–0.3 to VDD+0.3V Operating Temperature...............–20°C to 75°C
*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 (Ta=25°C)
Symbol Parameter Test Conditions Min. Typ. Max. Unit
VDD Conditions
VDD Operating Voltage — — 2.4 — 12 V
ISTB Standby Current 3V Oscillator stops —0.1 1µA
12V — 2 4 µA
IDD Operating Current 5V No load
FOSC=100kHz —250500
µA
12V — 600 1200 µA
IOUT Ou tput Drive Curren t for
DOUT, STATUS, VT,
TGO Pins
5V VOH=0.9VDD (Source) –0.6 –1.2 — mA
5V VOL=0.1VDD (Sink) 2 4 — mA
VIH “H” Input Voltage — — 0.8VDD —VDD V
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Symbol Parameter Test Conditions Min. Typ. Max. Unit
VDD Conditions
VIL “L” Input Voltage — — 0 — 0.2VDD V
FOSC Oscillator Frequency 10V ROSC=390kΩ—100—kHz
R
TE TE Pull-Low Resistance 5V VTE=5V — 1.5 3 MΩ
Functional Description
Encoder section operation
The 315 series of encoder begin a three-word transmission cycle upon receipt of a transmission enable
(TE, active h igh). T his cycle will re peat i tself as l ong a s the tra nsmiss ion en able (T E) is hel d high .
Once the transmission enable falls low the encoder output completes its final cycle and then stops as
shown below.
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
duri ng the addres s code perio d. Ea ch add res s pin c an be s et to one of the follo wing thre e log ic st ates:
Transmission timing
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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 con tents of the decoder ’s local address, the TGO pin toggles on ce 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.
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Decoder timing
Oscillat or freque ncy vs supply voltage
The rec o mm ended os cilla t or f r equency is FOSCD (HT6150 d ec oder) ≅ FOSCE (HT6150 encoder).
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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.)
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