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CC2541: RSSI to real world dBm

Ambroise Suter
Expert 3820 points
Part Number: CC2541

Hello,

How could we link the RSSI reading from the chip to real world dbm ?

I am also checking the datasheet for CC2541, below are some characteristic I want to know more.

 What are these parameters mean ? how are they tested/calculated ?

Thank you and best regards,

Ambroise

  • 0
    TI__Genius 15590 points

    Hi Ambroise,

    A colleague of mine will look into this and get back to you as soon as possible.

    Thanks,

    Alexis

  • 0
    TI__Mastermind 20210 points

    Hi,

    These parameters are measured during characterization of the device.

    RSSI read from the chip is the real received power in dBm within the error range stated in the "Absolute uncalibrated accuracy". For 2Mbps the error in the reading can be off by +/-6dB and for other data rates it should be within +/-3dB.

    The units of RSSI offset should be dB (looks like a typo in the datasheet). Basically RSSI(dBm) = RSSI Register value - RSSI offset(dB).

    The useful RSSI range is the dynamic range within which the RSSI measurement will be valid. Once the RF front end saturates the reported RSSI value will not change when input power is increased.

    As an example, if the front end saturates at -25dBm, the number 64dB shows that the lowest RSSI value that can be accurately measued is (-25 - 64) = -89dBm

    So the RSSI measurement range would then be -89dBm to -25dBm.

    Regards