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CC2340R5: CC2340R5 signal strength RSSI value does not become lower as the communication distance becomes longer

Alon Chen
Intellectual 380 points
Part Number: CC2340R5

Tool/software:

1.The customer is using CC2340R5 to make a Bluetooth car key. The ranging solution is based on the signal strength RSSI value. Currently, the customer is testing outdoor and communicating with mobile phone BLE. The signal strength received by CC2340 increases with the distance. In theory, the signal should become smaller and smaller. , the actual test distance is far away and there is an increase in some areas. What is the cause of this? . For example, is there RSSI automatic gain adjustment inside the chip, or is it affected by other factors?


2. Is there any description of the internal RSSI radio frequency block diagram and functions of CC2340R5? The reference materials on the official website are very rough and I cannot find relevant information.

  • 0
    TI__Intellectual 2880 points

    Hi,

    Thank you for reaching out. We will take a look at your question and get back to you as soon as possible. In the meantime, can you provide us with the SDK version you are using?

    Regards,
    Tanguy

  • 0 in reply to Tanguy Baltazart
    TI__Guru**** 171034 points

    Hi,

    Unless the customer is testing this on an anechoic chamber, which isolates the radios from external influences, it is very difficult to pinpoint an exact reason why the signal is reaching the receiver with different intensities depending on a single variable such as the linear distance between the two nodes.

    Among the various external influences are signal reflections, which can increase or decrease the signal intensity depending on its travelled path. Also, destructive interference from other signal sources can decrease the receiver's RSSI depending on the location of each node. One additional aspect that might also influence the performance is how the car key (receiver) is being held - its internal antenna can be influenced by the hand.

    We don't have any information about the radio in addition to what is published in the CC2340R5 Technical Reference Manual. 

    Regards,

    Rafael