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[CC2640] RSSI Resolution/Precision in dB

ROGERG
Mastermind 36170 points
Other Parts Discussed in Thread: CC2640

Hi,

could You please let me know the RSSI resolution of the CC2640 device. I could only find the absolute accuracy, but not the RSSI resolution/precision in the data manual.


Many thanks,

Gregor

  • 0
    TI__Guru** 105180 points
    Hi Gregor,

    Please see "23.3.4.3 CMD_GET_RSSI: Read RSSI Command" in the CC26xx TRM (SWCU117) from rev D. This section has details on the RSSI read command.

    Best wishes
  • 0 in reply to JXS
    TI__Mastermind 36170 points
    Hi JXS,

    looking at BT/BLE Core Spec v4.2 the "READ_RSSI" command is showing -127 to 20 dBm for LE. TRM says that RSSI is given as 8-bit signed value in dBm.

    Does that mean that resolution is (|-127| + 20) / 2^8 = ~ 0.57 dBm?

    Or is RSSI given as 1dBm steps from -127 to 20 with 21 ...128 not being used?


    Thanks and best regards,

    Gregor
  • 0 in reply to ROGERG
    TI__Guru** 105180 points
    The RSSI is given on signed form in dBm (whole values in 1dBm step). The value will be in the dynamic range of the receiver.

    Best wishes