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Production test : DTM vs BLE connection

Nicolas Deup
Intellectual 590 points
Hi, I would like to have your opinion regarding the final production test strategy : DTM vs BLE connection. Our production test equipement is ready to manage the DTM to validate sensitivity, output power and some channels. Does it make sens to add an extra test trying to establish a BLE connection if DTM test pass ? Thanks. Nicolas
  • 0
    TI__Guru** 105180 points
    Hello,

    DTM should fully test your RF and radio, depending on the level of test coverage. Doing a functional test with a BLE connection would be good to validate the system (power, sleep, etc.), but should be done in a controlled environment, such as in a shield box.

    Best wishes
  • 0 in reply to JXS
    Intellectual 590 points
    Hi JXS, The DTM coverage is used to check PHY layer checking the radio sensitivity. For this, PER is computed with a golden device, when extra attenuation is a shield box is such as radio input power is around 6 dB higher than Golden Device sensitivity. If PER is good, I make the assumption that quartz tolerance is good, as well as TX/RX radio chain. Now, if I assume that PER is good, how may it be possible that BLE connection fails ? It's just a question, I want to double check that to validate BLE connection, testing PHY layer is enough (nothing regarding power, sleep, switches, ...) Nicolas
  • 0 in reply to Nicolas Deup
    TI__Guru** 105180 points
    Hello Nicolas,

    If PER test is passing, it's unlikely that a BLE connection would fail due to radio issues. However, like you state, if you've enabled power management in your system, it would be helpful to verify that a BLE connection can be established and maintained with PM enabled. I'm also assuming you've verified external IO connections, such as an external sensor connected to the BLE SoC, to verify it is connected & functioning correctly.

    Best wishes
  • 0 in reply to JXS
    Intellectual 590 points
    Hi JXS, Thanks for this answer. Nicolas