• State Resolved
  • Locked Locked
  • Replies 3 replies
  • Answers 1 answer
  • Subscribers 46 subscribers
  • Views 158 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

TPL0501-100: About the GND reference on TPL0501-100

Bruce Dai
Intellectual 640 points
Part Number: TPL0501-100

Tool/software:

Hi AE,

       Can HA/WA/LA be treated as an independent resistor and used with a different ground reference from the SPI front-end GND (i.e., the two GNDs are not connected)?

       Could you please explain what potential issues this might cause?

Best Regards       

  • 0
    TI__Genius 10670 points

    Hi Bruce,

    According to the Absolute Maximum Ratings table, the only requirement for the pins is they must be greater than 0V and less than VDD. In the Power Sequencing, the datasheet specifies: "Protection diodes limit the voltage compliance at terminal H, terminal L, and terminal W, making it important to power up VDD first before applying any voltage to terminal H, terminal L, and terminal W." This means that you could run into issues if you do not connect the ground references. These pins should not be left "floating" in reference to the VDD and digital voltages.

    Thanks,
    Erin

  • +1 in reply to Erin Bowrie
    Intellectual 640 points

    Hi AE,

           May I ask, if two GND pins are both connected to ground, but they do not share a common ground reference, what kind of impact could this cause?

    Best Regards

  • +1 in reply to Bruce Dai
    TI__Genius 10670 points

    Bruce,

    At worst, the device won't work. There's likely ESD diodes connecting the potentiometer to the rest of the circuitry, and leaving the potentiometer floating may cause issues, such as extra current or damage on the pins.

    Thanks,
    Erin