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CC1201: evaluation rssi

Andreas Frühstück
Prodigy 250 points
Part Number: CC1201
Other Parts Discussed in Thread: CC1200

Hello everybody,

I have a problem understanding the registers RSSI0 and RSSI1 with the CC1201.

The signal strength should be specified in dB, in a range from -128 to +127 dB. In our application (with our own hardware), we have not yet seen any negative RSSI values. If the values have approached 0, the connection is more likely to be completely broken.

Is it correct that the value of RSSI1 is signed or is this value provided with an offset?

Regards,
Andy

  • +1
    TI__Guru* 79441 points

    Hi Andy

    The RSSI is a 12 bits two's complement number with 0.0625 dB resolution hence ranging from –128 to 127 dBm, as described in the User's guide.

    To get a correct RSSI value a calibrated RSSI offset value should be added to the value given by RSSI[11:0] (the RSSI offset will be a negative number).

    On our EMs (at least for the CC1200, I do not have a CC1201 available), this offset is measured to be -99.

    Reading for example 0x1F from RSSI1 (1 dB resolution) means that the RSSI is 31 + (-99) = - 68 dBm.

    Siri