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Original question:

PGA460: Where to download the TIDA-01597 Altium Project file and Software Files?

PGA460: Altium Design File Location?

Pete Sampson
Intellectual 440 points
Part Number: PGA460
Other Parts Discussed in Thread: , , TUSS4470

A few questions about the PGA460:

1) Where can I find the Altium design files for the . PGA460-Q1 EVM and the PGA460PSM-EVM? The user guides have schemaitcs but I'm looking for the altium design files and couldn't find them online.

2) If you're using the AutosetThreshold function and the return is above the threshold, are there options for pulling an I/O pin high to wake a micro controller or does a micro have to wake up and talk to the PGA460 after every transmit to see if there was a return over the threshold? Our product is run on battery so hoping the micro can sleep until the PGA460 wakes it after it detects a return over the detection threshold. 

3) The max transducer freq for the PGA460 according the the datasheet is 480kHz. Is there any was I can it be increased up to 1MHz?

4) In some of the TDC-1000 documentation such as the link below:

How to Select and Mount Transducers in Ultrasonic Sensing for Level Sensing and Fluid ID

it's reccomend that you add acoustic dampening to the backside of the transducer: "Commonly available silicon RTV can be used instead but requires a longer (24 hr) cure time." However, I don't see any of this in the PGA460 documentation. Is this because the PGA460 is primarily used for air transducer which may not need dampening and the TDC-1000 is used for water which does? I've also heard of using cork on the backside of the transducer but haven't seen that in any TI documentation.

  • 0
    TI__Mastermind 43730 points

    Hello Pete,

    1. Design files are found here: https://www.ti.com/lit/zip/slar136

    2. Unfortunately, there is not an IO that triggers when threshold is met.  You must read the data packet.

    3. No, the PGA460 cannot support above 480kHz.  I recommend the TUSS4470 for 1MHz operation.

    4. Take a look at section 3.4 of the FAQ below.  The app note you mention is for transducers operating with a water medium.   

    https://e2e.ti.com/support/sensors-group/sensors/f/sensors-forum/579804/pga460-q1-pga460-frequently-asked-questions-faq-evm-troubleshooting-guide 

  • 0 in reply to Eddie LaCost
    Intellectual 440 points

    Thanks Eddie! that was very helpful. I should explain a little more about my application. We are doing a battery powered object precense dection and we want to take a baseline reading at the start and detect any new object that appears after that, above the baseline threshold. Can you speak to the difference between the TDC-1000, TUSS4470, and PGA460 or other options for this purpose and specifically within the context of a battery powered system?

    I was also wondering what the differences are between the "Programmable VOUT threshold crossing on OUT4 pin" for the TUSS4470 VS the PGA460 using the"12-point time-varying threshold for object detection". If I have to have a micro command the slave to send a pulse, sleep, then read a register to see if there's anything there that's over the threshold, is there a better way to accomplish this for saving power? I assume SPI would be a better option than UART and would have to take into consideration clock settling times when waking up from a deep sleep. If the TDC-1000 is much more efficinet I could potentially implement a detection scheme with that chip but it seems like the TUSS44x0 line already has that feature.

    Do you still suggest the TUSS4470 for a battery operated application using transducers from 400kHz to 1MHz? I assume I still need to read the data packet to see if the theshold is exceded as with the PGA460. It looked like the TUSS4470 is configured mostly for direct drive and as I understand it I would need higher voltages (100v) to drive my transducer so I'd likely be following the "Center-Tap Transformer Drive Using External FETs" diagram in the datasheet. 

  • +1 in reply to Pete Sampson
    TI__Mastermind 43730 points

    Hi Pete,

    Please see the FAQ below, which has a breakdown of the different devices.

    https://e2e.ti.com/support/sensors-group/sensors/f/sensors-forum/748143/faq-ultrasonic-sensors

    The "Programmable VOUT threshold crossing on OUT4 pin" offers a single threshold crossing that can provide an interrupt on pin4.  This would be useful for waking up an MCU.  The "12-point time-varying threshold for object detection" enables finer control of the thresholds by allowing you to set 12 different threshold values that are applicable at varying times.  

    Yes, I would still recommend the TUSS4470 device for transducers from 400kHz to 1MHz.  For transducer driving voltage, see section 8.2.1.2.1 of the datasheet.    

  • 0 in reply to Pete Sampson
    TI__Mastermind 43730 points

    No problem!  Happy testing!