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MSP430i2041 eUART IrDA Maximum Baud rate

Koyo Kegasa
Expert 1260 points
Other Parts Discussed in Thread: MSP430I2041

I want to send data ( 4 channel analog input voltage data from the 24bit A/D at 4ksps ) from IrDA on eUART of MSP430i2041 to PC. 

Is it possible to set the data rate at 115.2kbps or higher ? ( 230.4kbps, 460.8kbps, 921.6kbps ?)

I found a IrDA module with 4Mbps below.

http://www.rohm.com/web/global/products/-/product/RPM973-H16

I also found a IrDA USB 2.0 Adapter for Windows 7 below.

Supports SIR and FIR from 115K bps to 4M bps data transfer rate

http://www.amazon.com/IrDA-USB-2-0-Adapter-Windows/dp/B004GED7SI/ref=sr_1_1?ie=UTF8&qid=1421216534&sr=8-1&keywords=USB+IrDA

If there are documents which I should read, please recommend me!

  • 0
    Guru 58965 points
    The IrDA encoder/decoder in MSP430 is for IrDA standard rates 2.4, 9.6, 19.2, 38.4, 57.6 and 115.2 kb/s only. Higher IrDA rates use different encode/decode methods not supported by MSP430.
  • 0 in reply to old_cow_yellow
    Expert 1260 points
    So, if I use MSP430's IrDA encoder / decoder, maximum bit rate I can get is 115.2kbps = 115200bps.

    As a matter of fact, I tried Infrared communication using LED and photo-transistor.
    ( Without IrDA encoder / decoder )

    Vcc = 3.0V
    R1(LED1) = 680 ohm ( I LED1 = 2.5 mA = 1/20 * 50mA )
    5.0mm Round Infrared LED LED1 = OS15LA5113A by OptoSupply
    ( Radiation Power = 12mW, Radiation Intensity = 55mW/Sr @If=50mA )

    R2(Tr1) = 2000 ohm
    5.0 mm PHOTOTRANSISTOR Tr1 = L-51ROPT1D1
    PARA LIGHT ELECTRONICS CO., LTD.

    Gap between LED1 and Tr1 = 10mm
    38400bps communication is all right.

    ( UART data '0' = low = LED ON, '1'=high=LED off, simple connection with series resistor only. )

    If I use IrDA encoder/decoder in MSP430's eUART, I can get 115.2kbps = 3 times higher speed.
    Thank you very much.

    By the way, are there any documents I can access freely, which state the IrDA maximum speed (115.2kbps)?
    I can't find the documents.

    Is it the limitation of the IrDA standard, or the limitation of the hardware?
  • 0 in reply to Koyo Kegasa
    Guru 58965 points
    It is the limitation of the IrDA standard. It specifies different encoding at different data rate. This simplifies the design of IR receiver.

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