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CC2640: Will heavy BLE transfer influences Sensor Controller ADC sampling?

kexue jiang
Prodigy 130 points

Part Number: CC2640

Hi, we use the sensor controller to sample the analog signal,then upload the ADC values over BLE. The period of alert event generated by SCS is about 24ms, so the cpu transmits BLE packets at period 24ms. Under this circumstance, the sampled adc values by SCS have little error. But when we increase the BLE traffic in order to exchange some other information with iOS, adc values jitter heavily. I wander will heavy ble traffic influence the ADC sample accuracy?

  • 0
    TI__Guru** 106705 points
    Hi Kexue,

    While this has not specifically been tested, it is not unlikely that the radio will affect the ADC somewhat when running. If you see large jitter when running the radio I would recommend to avoid using the ADC in that time period.

    Cheers,
    Fredrik
  • 0 in reply to Fredrik K
    Prodigy 130 points

    Thanks Fredrik, sorry for my late response. Since we want to achieve 500HZ sample rate. It's a little difficult to avoid using radio if we want such high BLE data throughput. If the radio does unlikely influence the ADC sampling since Sensor Controller is an independent module, I may consider if there some other reason might cause that ADC jitter. Thanks for your reply again!