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CC2520: cc2520 + CC2592

Went Cao
Genius 5550 points
Part Number: CC2520
Other Parts Discussed in Thread: CC2592

Dear  all

      I use CC2520 + CC2592, but find the communication distance is very short, about 10 meters, then, I add a SAW (TDK B9604), the communication distance is up to 100 meters.Questions as below:

      1. I want to know CC2520 + CC2592 without SAW  why is  communication distance short ?

      2. Please tell me how to analysis this bug, and show me the steps.

      3.  I had test the RSSI values with SAW and without SAW, like below, Why cc2520+cc2592 without SAW, the background RSSI is relatively small ? Does RSSI impact the communication distance ?

channel background RSSI

　

with SAW

without SAW

CH11

-105

-79

CH18

-90

-80

CH26

-108

-88
  • 0
    TI__Guru**** 317180 points
    If you look in the datasheet for CC2520 the chip has a given blocking performance meaning how strong a blocker can be before and still be able to receive the wanted signal. By using a SAW filter you improve the blocking by 50++ dB, dependent on the frequency of the interferer. Since you get a very high RSSI without a SAW filter this indicate that you have a fairly strong blocker/ interferer present where you test. This could be an interferer on one of the other channels or a frequency outside the 2.4 GHz band.
  • 0 in reply to TER
    Genius 5550 points

    Dear TER

    1. You said CC2520 has a given blocking performance, is it below datasheet picture ?

    2. In your opinion, there is an interferer on one of the other channels or a frequency outside the 2.4 GHz band, So, I want to know how to test which other channel impact it ? And how to test which  frequency outside the 2.4 GHz band ?

    3. Can I think the CC2592 don't filter some frequency outside the 2.4 GHz band ?  Right ?

  • 0 in reply to Went Cao
    TI__Guru**** 317180 points
    1) Yes
    2) Yes. Typically you should use a spectrum set on a wide span and use max hold
    3) CC2592 has no specific filtering