• State Resolved
  • Locked Locked
  • Replies 6 replies
  • Subscribers 33 subscribers
  • Views 1810 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.

DRV5053: Constant 0.6 V on output pin

Robert Warren
Prodigy 30 points
Part Number: DRV5053

Hello,

I have 4 different versions of the DRV5053 (CA, PA, EA, VA) through hole TO-92 package.  I have connected them on a breadboard according to the Data Sheet ( http://www.ti.com/lit/ds/symlink/drv5053.pdf ) Page 12, 8.2.1 Typical Application With No Filter

I get a constant ~0.6 V on the output pin with no change when I move a very strong neodymium magnet directly over the sensor.  (Very close and all orientations of the magnet)

K & J says that I should get 446 Gauss or 44.6 mT at 0.5" distance.

I see no change on my DMM or on my scope.  On the scope I have less than 0.1V of noise even when waving the magnet all over the sensor.

I checked the current and I'm getting 2.7 mA.

I have the .01 uF cap across VCC and GND.

I even tried to flip the IC around to make sure that I didn't have it hooked up incorrectly.  That caused the output to go to VCC, so I'm pretty sure that I had it correct the first time.

What in the world am I doing wrong?

  • 0
    TI__Genius 17990 points
    Hello,

    Thank you for using the TI forum. We are currently out of the office, but will get back to you as soon as we can.
  • 0 in reply to Mitch M
    Prodigy 30 points

    I totally understand. 

    One thing that I completely forgot to add was that I'm at 19.62 V for Vcc.

  • 0
    TI__Expert 4915 points

    Hi Robert,

    The device can only source 300uA, depending on your load requirements, I suggest using a pull up to VCC on the output pin, with care to respect the max sink current of 2.3mA. Would you be able to try so and let me know if it solves the problem?

  • 0 in reply to Robert Warren
    TI__Mastermind 20985 points
    Robert, 0.6V is a diode drop, indicating your pin connections might be swapped. Please verify your pinout according to datasheet Section 5.

    Best regards,
    RE
  • 0 in reply to RE
    Prodigy 30 points

    As most of my "AHA!" moments typically go, I would like to first say that I'm a complete idiot.  Thank you both for your suggestions, they were both applicable and appreciated.

    I had the pins wrong.

    In the documentation (I am using the TO-92 through hole package), the output pins are 1 - VCC, 2 - GND, 3 - Out.  I had GND and Out reversed.

    This happened because on the SOT-23 package, pin 1 - VCC, 2 - Out, 3 - GND.

    That is somewhat confusing in the documentation, but as I said before I am a complete idiot for not catching it on my own.

    Thank you both for your helpful insights, without which I probably would have dropped this project.  If I am successful in completing my prototype and ascertaining the necessary funding, I will most likely be purchasing these by the thousands or tens of thousands.

    Thank you again, and all the best.

    -Rob W.

  • 0 in reply to Robert Warren
    TI__Mastermind 20985 points

    Glad to help, Rob.  Good luck!