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CC2538: Can't do Receiver Sensitivity Test

user4226647
Prodigy 30 points
Part Number: CC2538
Other Parts Discussed in Thread: CC2530

Hi everyone，

    I use SmartRF Studio7 (v2.9.0)  to test the sensitivity of CC2538 module, the result failed. As the same way, to test the sensitivity of CC2530 module, it’s ok. Could you please tell me how to solve the issue?

    Test Environment is：

 Regards,
 Gang Zhou

  • 0
    TI__Mastermind 34000 points
    What level of sensitivity are you measuring ?
  • 0 in reply to RGW
    Prodigy 30 points

           We use the RF testing instrument ( the model is IQxel ) generate RF testing sigal, instead of "Interference Source"。For the module of CC2530, we can get the result of receiver sensitivity, it's about -97dB （our standard goal is -92dB）。For  the module of CC2538, we can't get the result of receiver sensitivity.

         Remove the RF testing instrument ( IQxel ), instead with CC2530 (module）or CC2538(module) to generate testing packet. Find out : the speed of  the module of CC2538 TX or RF Data is too slow, compare with CC2530. Further, we find that CC2538 use JTAG（2 wires）to connect with SmartRF Studio7. However,  CC2530 use special debug interface (2 wires, P2.1/P2.2）to connect with SmartRF Studio7。For the same data packets, the different interface leads to different speed, the following pictures are their waves.

          

     

  • 0 in reply to user4226647
    TI__Mastermind 34000 points
    Hi,
    Have you tested several CC2538 modules ?
    Have you tested with a TI CC2538 EM ?
    Do you have the schematic of your CC2538 module ?
    Regards,
    Richard
  • 0 in reply to RGW
    Prodigy 30 points

    Hi，RGW：

           I have tested four ours CC2538 modules and two third CC2538 EM, their picture is following:

         

          We have no TI CC2538 EM, so we haven't tested it.

           I suspect strongly that the two wires JTAG interface protocol leads to the issue, for above wave picture (via oscilloscope) and the following test data（Magbe we should change the parameters of  SmartRF studio, or use other interface (e.g UART) ,but we don't know how do it. ）：

    TX_CC2538, RX_CC2538
    Packet Interval Packet Length Packet Number Time 
    Consuming（ms)    		 Receive 
    Number    		 Correct 
    rate
    10ms 100 100 155722 100 100.00%
    30 100 51171 100 100.00%
    15 100 28654 100 100.00%
    2 100 9367 100 100.00%
    0 100 100 154229 100 100.00%
    30 100 49752 100 100.00%
    15 100 27885 100 100.00%
    2 100 8628 100 100.00%
    TX_CC2538, RX_CC2530
    10ms 100 100 79821 100 100.00%
    30 100 27357 100 100.00%
    15 100 16160 100 100.00%
    2 100 6479 100 100.00%
    6ms 100 100 79813 100 89.00%
    30 100 27040 100 94.00%
    15 100 15811 100 94.00%
    2 100 6110 100 98.00%
    TX_CC2530, RX_CC2538
    390ms 100 100 42126 100 100.00%
    75ms 100 100 10692 98 25.50%
    30 100 9740 94 31.90%
    15 100 9807 100 100.00%
    2 100 9219 100 100.00%
    50ms 100 100 12180 97 17.50%
    30 100 7450 99 29.00%
    15 100 7530 95 23.00%
    2 100 7137 100 100.00%
    TX_CC2530, RX_CC2530
    50ms 100 100 8462 100 100.00%
    30 100 7528 100 100.00%
    15 100 7331 100 100.00%
    2 100 7142 100 100.00%
    6ms 100 100 4138 100 100.00%
    30 100 3170 100 100.00%
    15 100 2832 100 100.00%
    2 100 2775 100 100.00%

      Regards