ST12 SunRom, ST12 Datasheet - Page 2

• Manufacturer Part Number: ST12
• Description: IR/RF Remote Control Encoder/Decoder IC
• Manufacturer: SunRom

4.
Pin Number
1-4
5
6-13
14
15
16
17
18
5.
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.
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.
In momentary mode, any combination of the encoder data inputs D0-D7 may be grounded
simultaneously.
6.
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
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Pin Definitions
Encoder
Decoder
Latching Key-Press
Momentary Key-Press
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
DATA RX-TX – Transmit data or Receive Data from this pin through IR/RF
Interface
LATCH-MOM – Applicable in Decoder Mode
In encoder mode tie this pin to GND or VCC and do not leave it floating
Mode IR/RF – Selects Transmit / Receive by Infrared or Radio Frequency
Encoder sends 40khz Modulation signal in IR Mode for driving IR LED
Decoder inverts received data in IR Mode
Encoder if pin is tied to VCC
Decoder if pin is tied to GND
Latching output (Toggle Output) if pin is tied to VCC
Momentary output if pin is tied to GND
IR Mode if pin is tied to VCC
RF Mode if pin is tied to GND
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Description
2
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