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INA226: Low current sensing

Part Number: INA226

Hi

I'm struggling to see if it's possible to use this device to measure low currents in the order of 10's of uA.

If I can use a 1k shunt resistor then I should be ok, but when doing so I get different measured results to that expected. For example, I have a 5V supply and a 200k load. The current should be 25uA but the INA226 reads 31uA.

My guess is that the INA226 is actually responsible for this difference due to the current into its sense pins. Am I right?

How else (what other device) can I measure low currents?

Thanks.

  • Hi Graeme,

    For low currents in the order of uA's you need to use Instrumentation Amplifiers. Our current shunt monitors are not able to measure this small currents accurately. You can post in the Precision Amplifiers forum (e2e.ti.com/.../) . They might be able to follow up in your application and recommend a suitable device.