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    Document: Datasheet Date: 25-Dec-08 Model #: 3049 Products Page: www.sunrom.com/p-744.html

    ST3049 - Infrared remote control decoder RC5The main function of the ST3049 is to check and convert thereceived coded data (RC5) into latched binary outputs.Received data with any address will be accepted; thereceived data and address are then outputs.

    Accepts RC5 codes with bi-phase transmission (SAA3006,SAA3010, PT2210 and similar transmitters). This chip isfunctionally equivalent to SAA3049 and TDA3048 which are

    now discontinued.

    CA is command acknowledge pin outputWhen a valid RC5 frame is received and newdata is updated on output, this pin goes low for50ms.

    T0 is TOGGLE bit outputThis bit toggles each time a new key is pressed.That allows identifying between holding down a

    key and pressing a key twice or more.D0 to D5 are COMMAND bits outputsSix bits of information output on which key ispressed. Up to 64 keys are supported withthese six bits.

    A0 to A4 are ADDRESS bits outputsFive address bits outputs (0=TV, 20=CD, ...).

    About RC5 ProtocolPhilips adopted or created the RC5 standard that uses fixed bit length and fixed quantity of bits.

    Each time you press a button at the Philips remote control, it sends a train of 14 bits, 1.728ms perbit, the whole train is repeated every 130ms if you keep the button pressed. A toggle bit is sent withdata which has information if they key is kept pressed or same key is pressed twice.

    D3

    A0

    Y1

    4 Mhz

    A1

    A3 A4

    C322p

    D5D4

    +5V

    U2ST3049

    4

    7

    8 9 1 0

    1314

    1516171819

    232425

    262728

    IN

    V C C

    G N D

    X 1

    X 2

    T0CA

    A0 A1 A2 A3 A4

    D0D1D2D3D4D5

    D1

    T0

    D1LED

    CA

    D2

    D0

    C1100nF

    +5V

    U1TSOP1738

    1 3 2

    I R G N D

    V C C

    A2

    C222p

    R1470R

    +5V

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    Sunrom Technologies Your Source for Embedded Systems Visit us at www.sunrom.com 2

    Commonly used Address and Command data are as per table below

    SYSTEM ADDRESS EQUIPMENT

    0 TV SET 11 TV SET 2

    2 VIDEOTEXT

    3 EXPANSION FOR TV 1 AND 24 LASER VIDEO PLAYER

    5 VIDEO RECORDER 1 (VCR 1)

    6 VIDEO RECORDER 2 (VCR 2)7 RESERVED

    8 SAT 1

    9 EXPANSION FOR VCR 1 OR 210 SAT 2

    11 RESERVED

    12 CD VIDEO

    13 RESERVED14 CD PHOTO

    15 RESERVED16 AUDIO PREAMPLIFIER 1

    17 RECEIVER / TUNER

    18 TAPE / CASSETE RECORDER19 AUDIO PREAMPLIFIER 2

    20 CD

    21 AUDIO RACK22 AUDIO SAT RECEIVER

    23 DCC RECORDER

    24 RESERVED25 RESERVED

    26 WRITABLE CD

    26-31 RESERVED

    COMMAND (in decimal) DESCRIPTION of FUNCTION

    0-9 NUMERIC KEYS 0 - 912 STANDBY

    13 MUTE14 PRESETS16 VOLUME UP

    17 VOLUME DOWN

    18 BRIGHTNESS +19 BRIGHTNESS -

    20 COLOR SATURATION +

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    Sunrom Technologies Your Source for Embedded Systems Visit us at www.sunrom.com 3

    21 COLOR SATURATION -22 BASS UP

    23 BASS DOWN

    24 TREBLE +25 TREBLE -

    26 BALANCE RIGHT

    27 BALANCE LEFT48 PAUSE

    50 FAST REVERSE

    52 FAST FORWARD-53 PLAY

    54 STOP

    55 RECORD63 SYSTEM SELECT

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