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PGA309 Typical Configuration

Steven Schears
Prodigy 10 points
Other Parts Discussed in Thread: PGA309

I recently purchased a PGA309 EVA to test out the functionality of the PGA309 and whether it would be a good fit for my application.  After being able to successfuly program my demo board automatically (integrating the sensor test stand controls with the labview PGA309 software) with the 3 wire configuration I ordered some pieces to match the typical configuration.

I have tried to connect the prototype boards to the USB DAQ platform and have my Vout going to the One Wire (J1 - Pin 11), V+ to Vcc(J1 - Pin 18) and ground to ground.  This is matching the configuration I had on the PGA309 Test board.  My intentions are to be able to program the PGA309 on the protoboard and install in my sensors to do some preliminary testing to see if this can replace our current hardware.

Is there anything else I need to have connected on the USB DAQ platform besides the 3 wires in the 3 wire setup?  I also am using an off the shelf eeprom (24LC16BT-I/OT ).  Is there something I need to do to program this before I can run the calibration procedure?

Any insight is greatly appreciated!

  • 0
    TI__Mastermind 27715 points

    Hello Steven,

    Thank you for your interest in the PGA309.

    In order for the calibration to work, the USB-DAQ must also be able to measure the output of the PGA309 using the platform's onboard ADCs. To do this, connect your Vout to ads1_Vin+ (J1- Pin 5) and GND to ads1_Vin- (J1 - Pin 6). After doing this the system should work.

    The software automatically handles the initial programming of the EEPROM. Just make sure that the EEPROM is powered properly and is connected to SDA and SCL of the PGA309. 

    Let me know if you still have difficulty calibrating your protoboard after following these recommendations.

    Best regards,

    Ian Williams
    Applications Engineer
    Precision Analog - Op Amps