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BOOSTXL-PGA460: Adding a sensor to the board

Gabriel Achour
Prodigy 20 points
Part Number: BOOSTXL-PGA460
Other Parts Discussed in Thread: PGA460

Hello,

I was wondering if it was possible to solder another ultrasonic sensor to the board to process multiple sensors with the same board. I see on the daughter card that there is an empty slot (J14) on the transformer driven side and two empty slots on the direct driven side (J9 and J11). If it is possible, how many sensors max can the EVM handle?

If not could the motherboard card process two or more different daughter cards? And if it is still not the case, can we stack another EVM on top of the first one? Would the LaunchPad card be able to process both or even more?

Thanks,

Gabriel 

  • 0
    TI__Mastermind 27950 points

    Hi Gabriel,

    If you would like to use multiple transducers with a single PGA460 device, then I recommend you view the "PGA460 Multiplexing in Half-Bridge Driver Mode for Mono-static or Bi-static Transducers" discussion at https://e2e.ti.com/support/sensors/f/1023/t/603257

    I have only shared transducers on the same net using a half-bridge driver case. You may have trouble sharing multiple transducers on the same net in a transformer driver case due to the matching circuitry between the transformer and transducer. What is your goal in node sharing multiple transducers?

  • 0 in reply to Akeem Whitehead
    Prodigy 20 points

    Hi Akeem,

    Thank you for your reply. For now I just wanted to use the EVM and see if I could simply add sensors to it instead of designing a new board. Here is a picture of what I want to do. I want to get the distance of the closest objects for each sensor, so that as an output I have an array with the corresponding distances for each sensor.  The black boxes represent Murata ultrasonic sensors.

  • 0 in reply to Gabriel Achour
    TI__Mastermind 27950 points

    Hi Gabriel,

    With the EVM hardware as-is, you will not be able to get the individual sensor results if they all share the same driver and receiver nodes of a single PGA460 device. If they all share the same nodes, then you will effectively have created a single transducer with a very wide field-of-view.

    You will need either multiple PGA460 devices, each with a dedicated transducer, or the multiplexing solution I previously mentioned.