Other Parts Discussed in Thread: INA228
Hello,
I am currently utilizing five INA226 chips in conjunction with a single microcontroller to monitor voltage and current across five circuits. These chips are configured to average 16 data points, with a conversion rate of 204 microseconds. The voltage being measured is under 2V, and the current is less than 100 mA. However, during data logging, I'm observing unexpected spikes—voltage surges up to 100V and current spikes reaching 1A (sometimes -1A). Yet, when I use an oscilloscope to measure the voltage/current directly, these anomalies aren't present. Our system is designed to be low noise, with a maximum peak-to-peak voltage of 1 mV. I'm puzzled about what might be causing this issue and am considering whether switching to the INA228 could offer a better solution for our project.
Something on the side:
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Increasing the average number/conversion rate could potentially help, but we don't like to slow down our system.
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The fact that we continuously read from the chip, could this be the reason for the spikes?
We are not implementing any input filter for the INA chips.
Thank you for your time.