INA228: Microamp current sensor

J.P. Moszynski

Part Number: INA228

Hello, I'd like to measure DC current in the range of 0 to 100 uA from a voltage source of up to 90V. Digital output would be preferred so that I can communicate directly to an Arduino. Will the INA228 do the trick?

Thanks for the help!

over 4 years ago

0 kai klaas69 over 4 years ago

Guru 140200 points

Well, J.P., your application would violate the maximum common mode input voltage of INA228, which is +85V.

Kai

0 J.P. Moszynski over 4 years ago in reply to kai klaas69

Prodigy 20 points

Yes, I suppose I was hoping that someone would have enough experience to say that the extra 5V shouldn't matter. There seems to be other options though as I learn more about it. Looking into shunt resistor values and in amps...

Thanks for looking into it though.

0 Javier Contreras4 over 4 years ago in reply to J.P. Moszynski

TI__Mastermind 34860 points

Hello J.P.

The INA228 is almost the perfect fit but I would never recommend going above any devices Absolute Max Ratings. See this application note. Most CSA will have a large input bias current so be aware especially with high voltage input capabilities.

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INA228: Microamp current sensor