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PGA400-Q1: Getting Started with TIDA-00793 Reference Design

Lauren Sabra
Prodigy 125 points
Part Number: PGA400-Q1
Other Parts Discussed in Thread: PGA302, PGA300, PGA305

Hello,

I have been looking at the TIDA-00793 reference design and am wondering where I can find the "PGA400-Q1 calculations" and "PGA400-Q1 signal chain" spreadsheets? Also, is there any object code available for this reference design?  I am working on a pressure sensor design for a White Goods application and PGA400-Q1 seems like a great fit. I would like to get a demo up and working very quickly. Thanks!

  • 0
    TI__Mastermind 31655 points
    Hi Lauren,

    Is the Q1 qualification needed for your application? And is the ability to program custom firmware a necessity in your system? Would a device with an integrated temperature/pressure linear compensation algorithm meet your needs? What kind of output do you need (digital, voltage, 4-20mA, etc)?

    If the Q1 and custom firmware are not necessary I would suggest looking into the PGA305/PGA300, or maybe even the PGA302 depending on your output needs. All of these devices include a built in compensation algorithm that makes it easy to calibrate the system, and will not require firmware development.

    If none of these quite meet your needs please let me know and I will track down those spreadsheets.

    Regards,
  • 0 in reply to Scott Cummins
    Prodigy 125 points

    Thanks for your speedy response! No, I do not really need the Q1 qualification or the ability to program custom firmware. I started down this avenue since there was the TIDA-00793 reference design and I am short on time. I need a ratiometric voltage output 0.5-5V for pressures up to 300psi. I was looking into the PGA300, but found the bridge voltage supply too low for the membrane I am using. Are there any options that would supply an excitation voltage of 5V?

  • 0 in reply to Lauren Sabra
    TI__Mastermind 31655 points
    Hi Lauren,

    The output of the bridge excitation voltage for PGA3xx devices is limited to 2.5V. You can use this as an input to an external buffer powered from your VDD supply so that you still benefit from the stable bridge excitation, but you can gain it up to fit the needs of your sensor. Something inexpensive and simple like a TL07xx device would be fine for this application.

    Regards,
  • 0 in reply to Scott Cummins
    Prodigy 125 points

    Hi Scott, 

    Thank you for the recommendation, I have ordered a PGA302-EVM!

    - Lauren

  • 0 in reply to Scott Cummins
    Prodigy 125 points
    Hi Scott,

    I've been getting familiar with the PGA302-EVM hardware and GUI for a day or so now and I am wondering if this evaluation board can be used to calibrate a PGA302 IC on a custom PCB. If so, what connections need to be made to interface the two?

    Thanks,

    Lauren
  • 0 in reply to Lauren Sabra
    TI__Mastermind 31655 points
    Hi Lauren,

    Yes, you can connect to an external PCB.

    The connections will depend on the interface you use (I2C or OWI), and how you would like to measure the VOUT. In all cases, I would suggest connecting the VOUT from your PCB to the VOUT pin on the EVM just so that the GUI will be able to correctly read some voltage from the ADC. If the VOUT on the EVM is floating or grounded, the calibration procedure in the GUI can encounter some errors.

    For the communication you only need to connect the SCL/SDA lines for I2C, or for OWI make sure that the VDD point on the EVM is connected to your PCB.

    Regards,
  • 0 in reply to Scott Cummins
    Prodigy 125 points

    Hi Scott,

    Thanks, I have everything up and working now. Is there a mass calibration tool available for the PGA302?

    - Lauren

  • 0 in reply to Lauren Sabra
    TI__Guru**** 180961 points
    Hi Lauren,

    We are looking into this, but current we do not offer a mass calibration solution.