• State
  • Locked Locked
  • Replies 3 replies
  • Subscribers 30 subscribers
  • Views 114 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

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.

TMAG5328: TEST Pins

Keith Keller
Expert 6500 points
Part Number: TMAG5328
Other Parts Discussed in Thread: TEST2

Hello,

We're working on a design with TMAG5328A1 and wondering about the test pins.

TEST1 recommended floating, TEST2 recommend to ground.  (image below)

  • Is it ok to pull TEST1 to either VCC or ground (since really don't like floating inputs)?
  • Considering FMEA, what would be the operation if either TEST1 or TEST2 were pulled up, or down?

Thank you, Keith

  • 0
    TI__Mastermind 22745 points

    Hello Keith,

    Connecting TEST2 to any potential other than the potential the GND pin is at is not advised.  TEST2 is roughly at the same potential as GND with only a few ohms of resistance between, therefore connecting TEST2 to another potential would possible result in more current sinking or sourcing into that pin than what it was designed for and it may damage the device.

    As for TEST1, I am still awaiting a response from our design team.  I will provide you with an update when I get that clarified from them.

  • 0 in reply to Patrick Simmons
    TI__Expert 6500 points

    Hello,

    So if TEST2 is pulled to VCC, there will be damage to the IC?

    Please let us know on TEST1 being pulled to VCC or GND?

    Thanks very much, Keith

  • 0 in reply to Keith Keller
    TI__Mastermind 22745 points

    Hello Keith,

    There are several outcomes possible for shorting TEST2 to VCC.  If you were powering with a battery that had a very low resistance connection, you might kill the part or you might kill  the battery.  Alternatively if you were powering from some other supply, you might trigger some over current circuitry that safely shuts down the system or you might cause the supply to collapse.  Then it is possible that if the resistance was great enough between the power source and this pin, the device would not be damaged, but would not work as intended or could not be expected to meet datasheet specs as it was not being operated in a recommended configuration. 

    As for TEST1, during device operation there is a period of time in which it is driven.  As such, shorting to that pin may result in a current inrush or out rush.