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SunRom

ST12 Datasheet

IR/RF Remote Control Encoder/Decoder IC


ST12 Datasheet Preview


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ST12 CODEC – IR/RF Remote Control Encoder/Decoder IC
1. Overview
ST12 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.
ST12 is truly a single-chip remote control solution.
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 RF any general purpose RF
Transmitter-Receiver pair would suffice.
The ST12 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 ST12 IC for
encode or decode operation automatically at power-
up.
18 PIN DIP
A0
A1
A2
A3
GND
D0
D1
D2
D3
1
2
3
4
5
6
7
8
9
18 MODE IR - RF
17 LATCH - MOM
16 DATA RX - TX
15 ENC-DEC
14 VCC
13 D7
12 D6
11 D5
10 D4
2. Features
Encode / Decode on single chip
Built in Oscillator
Minimum External Components
Wide operating voltage range. (2.0 - 5.5V)
Single chip Encoding Decoding Mode
40kHz carrier for infrared transmission medium
18 pin DIP package
3. 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
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4. Pin Definitions
Page 2 of 6
Pin Number
1-4
5
6-13
14
15
16
17
Description
A0-A3 - 4 bit Address Input
GND – Ground
D0-D7 – 8 bit Data input if configured as Encoder
D0-D7 – 8 bit Data output if configured as Decoder
VCC - +5V DC
ENC-DEC – Configure chip as Encoder or Decoder
Encoder if pin is tied to VCC
Decoder if pin is tied to GND
DATA RX-TX – Transmit data or Receive Data from this pin through IR/RF
Interface
LATCH-MOM – Applicable in Decoder Mode
Latching output (Toggle Output) if pin is tied to VCC
Momentary output if pin is tied to GND
In encoder mode tie this pin to GND or VCC and do not leave it floating
18 Mode IR/RF – Selects Transmit / Receive by Infrared or Radio Frequency
IR Mode if pin is tied to VCC
RF Mode if pin is tied to GND
Encoder sends 40khz Modulation signal in IR Mode for driving IR LED
Decoder inverts received data in IR Mode
5. Encoder
When configured as Encoder the chip will transmit signal containing 4 bit Address A0-A4 and 8 bit of
Data D0-D7 from its DATA RX-TX pin. Removing ground from a data input will end the transmission.
Infrared transmission will include data modulated for 40 kHz frequency for driving Infrared LED. Radio
Frequency Transmission mode will transmit data in bi-phase Manchester encoding.
5.1. Latching Key-Press
With the decoder in latch mode, data inputs D0-D7 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.
5.2. Momentary Key-Press
In momentary mode, any combination of the encoder data inputs D0-D7 may be grounded
simultaneously.
6. Decoder
Decoder outputs can sink or source up to 25mA per pin with a total combined device package maximum
of 200mA allowing direct remote control of LED’s, solid-state relays, and other logic devices without the
need for secondary driver circuits.
© 2006 Sunrom Technologies http://www.sunrom.com
2
Page 2

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Page 3 of 6
7. Data & Address Validation
Encoder address pins A0-A3 must be set to the same logic levels as decoder address pins A0-A3. 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 D0-D7 outputs.
Each 13-bit packet transmit time requires approximately 48mS. Care should be taken not to violate these
timing requirements when the ST12 is controlled by high-speed logic circuits or embedded controllers
such as the PIC, BASIC Stamp or 8051.
Important: Address input pins A0-A3 & 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.
8. Transmitter Application Schematic (Encoder)
SW1 SW
SW2 SW
SW3 SW
SW4 SW
U1
ST12 CODEC
1
2
A0 MODE IR - RF
3 A1 LATCH - MOM
4 A2 DATA RX - TX
5
6
A3 ENC - DEC
GND
VCC
7 D0
D7
8
9
D1
D2
D3
D6
D5
D4
18
17
16
15
14
13
12
11
10
CN1
SIP2
2
1
9V Battery
D2
1N4007
U3
LM78L05
3 IN
OUT
GND
VCC
1
C2 C3
100n
100n
C1
100n
VCC
IR
J1
JUMPER3P
RF
VCCSW5 SW
SW6 SW
SW7 SW
SW8 SW
R2
4K7
Q1
BC547
VCC IR
D1
IR LED
Q2
BC547
E1
ANTENNA
U2 STT-315
RF
VCC
R1 10K
VCC
C4
100n
Sunrom Technologies
Title 8 Channel Remote Transmitter
Code 1001-3487
Date: Monday , May 01, 2006
http://ww w.sunrom.com
Rev 1
Sheet 1
of 1
© 2006 Sunrom Technologies http://www.sunrom.com
3
Page 3
Part Number ST12
Manufactur SunRom
Description IR/RF Remote Control Encoder/Decoder IC
Total Page 6 Pages
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