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.

INA226 - Not behaving as inaccurately as the data sheet suggests

Other Parts Discussed in Thread: INA226, INA226EVM

I wonder what I could be doing wrong.

This discussion focuses on the Vbus measurement of the INA226. No load current is flowing through the Rsense resistor.

An INA226, soldered into a prototype /  development board, is exhibiting error  ranging from 1% to 15%

The Input voltages range from about 3V to 17V, with lower voltages being worst.

Another INA226, on yet another protoboard, exhibits error of about 0.75%, still in excess of the 0.1% max in the data sheet.

OK. What could I be doing wrong? Is it possible tht this device has a glass jaw, and solering it into place damages it?

These cases are purposely kept simple. Thanks in advance.

  • Michael,

    Would you mind sharing your schematics?  We test the INA226 to the 0.1% limit so I'm quite confident there is something in the circuit or setup causing the error.  I've done quite a bit of experimentation with the INA226EVM as well and haven't had any problems with the performance.  Also, I've not heard of any devices exhibiting issues after appropriate soldering.

    Best regards,

    Jason Bridgmon

  • Thanks, Jason.

    Your part is doing very well. It is not TI's fault that my soldering skills need improvement. I reflowed solder with a heat gun and it came up just fine. Handy, ordinary bench instrumentation was within 1% of the actual reading. When I grabbed Testing-Grade Equipment, the readings were in that 0.1% range, like you said.

    Thanks again. Sorry for the interrupt.

    MABanak

  • I am glad it worked out!

    Jason Bridgmon