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PGA460-Q1: PGA460-Q1: PGA460-Q1 Multiplexing in Half-Bridge Driver Mode for Mono-static or Bi-static Transducers

Antonio De Renzis
Prodigy 20 points
Part Number: PGA460-Q1
Other Parts Discussed in Thread: PGA460, TLIN1029-Q1

Dear all,

I've found the thread "PGA460-Q1: PGA460-Q1 Multiplexing in Half-Bridge Driver Mode for Mono-static or Bi-static Transducers" on this forum and it is very interesting for my application. I have a question: is it possible to extend the same approach to an array of transformer driven ultrasound transducers ? The example listed, if I'm not wrong, is related to a direct drive: I would like to do the same (using a single PGA-460 device) to drive an array of transformer driven ultrasound devices. Is it possible ? do you have a suggested schematic ?

Thanks in advance.

Best regards

  • 0
    TI__Mastermind 27950 points

    Hi Antonio,

    Unfortunately, we have not yet devised a multiplexing solution for a transformer driven solution. As you've noted, the existing solution only applies to a direct driver.

    The problem with multiplexing a transformer driver is:

    • if you are multiplexing the primary side of the transformer, than the mux's channels need to be rated for high current (typically up to 500mA).
    • if you are multiplexing the secondary side of the transformer, then the mux's channels need to be rated for high voltage (typically up to 200Vpp).

    Finding a mux rated for 500mA or 100Vpeak per channel may rare and/or expensive, and you could be better off buying individual PGA460 modules in a bus interface topology (UART or SPI). If you come up with a discrete muxing schematic solution, I can help you review it to determine if it will be feasible.

  • 0 in reply to Akeem Whitehead
    Prodigy 20 points

    Dear Akeem,

    thank you for your reply.

    I agree with you about the difficulty to find a right solution concerning multiplexer of primary or secondary side of the transformers.

    Anyway, I see on the web a lot of car parking sensor devices ultra low-cost able to manage up to 4-5 transducers and I ask to myself how do they manage this issue without using multiple devices similar to PGA-460: are there different integrated solutions able to drive multiple transducers ? Are you aware of this ? could you give me some precious suggestions ?

    Best regards

    Antonio

  • 0 in reply to Antonio De Renzis
    TI__Mastermind 27950 points

    Hi Antonio,

    I have not yet seem a multiplexed transformer-driven solution in a real world end equipment. Most automotive ultrasonic sensor parking solutions typically use a LIN/OWU bus to save on cable cost, but they still use a dedicated PGA460 module for each position on the bumper. The PGA460 supports One-Wire UART (OWU), which is a single wire interface that enables a bus interface topology. Up to eight PGA460 devices can share a single OWU bus, which all feeds back to an ECU/MCU's UART port through a LIN transceiver (i.e. TLIN1029-Q1) . Each PGA460 module would only require a 3-pin connection in this case: PWR, OWU, GND.