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CC1200DK: RSSI Range for the CC1200

rsps1008
Prodigy 40 points
Part Number: CC1200DK
Other Parts Discussed in Thread: CC1200

Hi,

I recently use the Zoul Firefly to make the sub-GHz transmission, but I notice that the document of CC1200 mention the Excellent Receiver Sensitivity is -109, that is different from my other experience (-109 means signal is worst).

I want to know that how do I transform this value in general like -30 dbm means good, or can you tell me if -109 is excellent, what value means bad or worst?

Thank you very much!! 

  • 0
    TI__Guru**** 317180 points

    For sensitivity, a low value is the best. This shows that the receiver is able to receive a very week signal. 

  • 0 in reply to TER
    Prodigy 40 points

    Sorry about that I didn't notice that the value is not Received Signal Strength Indication value. But now, I have an another question that is my RSSI for zoul pad calculated the RSSI value in about -109 to -100 even two pads is very close, and the Contiki-NG indeed make the RSSi offset. Do you know the reason of that? 

  • 0 in reply to rsps1008
    TI__Guru**** 317180 points

    I'm not familiar with Zoul Firefly/ pad nor how Contiki-NG is implemented on this device. Are you able to read the RSSI registers directly?

    Are you sure that you have set up the device to use CC1200 and that the correct antenna is selected? Do you know that you send a test signal on the frequency you are monitoring? 

  • 0 in reply to TER
    Prodigy 40 points

    I didn't read RSSI registers directly, I let Contiki OS do that. So your suggestion is that I should read the RSSI registers?

    And I sure that the driver and antenna are right, and I did sent the test signal on the frequency 920 I am monitoring with my oscilloscope.

  • 0 in reply to rsps1008
    TI__Guru**** 317180 points

    I'm not familiar with Zoul Firefly/ pad nor how Contiki-NG is implemented on this device. This is not a module of software delivered by TI. Hence you have to do debugging yourself to find out if HW or SW is the issue and what in HW or SW that causes strange results. Have you contacted support@zolertia.com? 

    We can help you with CC1200 but then you have to run commands directly on the device.

  • 0 in reply to TER
    Prodigy 40 points

    I want to know that can I use the Contiki system and read the RSSI register with any Ti's tools at the same time? Or can you suggest that how can I get right RSSI value without Contiki. (I left the message about it at zolertia.com but no reply)

    zolertia.com

  • 0 in reply to rsps1008
    TI__Guru**** 317180 points

    In theory you can use SmartRF Studio but that require that you manage to access the SPI interface and disable the MCU on the module to ensure that only one tries to use the SPI bus at a time.