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.
Hello:
I have an application using the INA219A to read the current of a motor. I read on section "8.4.1 Filtering and Input Considerations" that is was recommended to protect the inputs of the INA219 with TVS diodes, but I am unsure of the best place they should be. I also wanted to ask for the best way to protect the INA219. I built the following circuit but it seems I am getting a voltage between the INA219 pins of 39mV with no load (less than 2uV on the Rsense resistor). I believe I put the TVS diodes on a wrong position, which is causing this offset.
My application does need all the protection we can get, so I would really appreciate if you could recommend the best practice for it.
The INA219A will measure the current going into an HBRIDGE. Nothing else is connected to the H bridge motor voltage (VMOTOR_IN).
Hello:
Thank you for your message. And sorry for the late reply.
I measured again and now I am getting 130uV on the shunt and 510uV on the capacitor. I will send you the gerber files for the board.
Thanks!