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CC2564: RSSI Boundary Values

Chuchen Wang
Expert 3470 points

Part Number: CC2564

Hi,

My customer has the following question:

The TI chip appears to have a band-gap in the RSSI for adjusting its TX power which makes sense and appears to be working as intended.
However if we hit (for example) an RSSI value of -30, our TX power will max out to +12dBm. The Ti then appears to stay at this max Tx power until we hit the bound of this band-gap (~-10). The main problem we are facing is our normal use-case we tend to always stay below this -10 bound, so once we hit a bad spot and the Tx max to +12dBm our system can rarely recover.

Can we adjust these RSSI boundary values?
Are we also getting locked into a low efficiency modulation scheme when we are in this bounded region?

Thanks,

Chuchen

  • 0
    TI__Genius 13250 points
    HI Chuchen,

    I am not sure I understand your question here. What are you referring to as Band gap? Is this an out of band interferer that you are referring too.

    The TX power of the IC you a referring to is +12dBm correct? So then you are providing an interfere signal at the same frequency but at a lower power?

    Please help to clarify your setup here.

    Thanks,
    Riz
  • 0 in reply to Rizwan Murji
    Prodigy 10 points
    Hi Riz,

    I am referring to is just the observed behavior of the Tx ouput power based on the RSSI value; The Tx output power seems to be adaptive until the RSSI hits the lower limit of ~-30 in which case it goes to maximum Tx output power of +12dBm. The Tx power seems to remain at max power until the RSSI recovers to -10 where the Tx output power then appears to adjust as needed. Can we adjust these upper and lower limits on the RSSI which triggers the Tx output power to go from always maximum back to variable?


    In our test cases we are not introducing any intentionally interfering signals other than testing the product out in the field.
  • 0 in reply to Daniel Quiros
    TI__Mastermind 35795 points
    Daniel,
    Can you pls provide more info :
    - Host MCU ?
    - Test setup details - h/w , s/w ?
    - Pls share fwr logs : processors.wiki.ti.com/.../CC256x_Logger_User_Guide

    Thanks
    Saurabh