PmodISNS20, Minimum Measurable Current

[syu]

Hi, I ran into PmodISNS20 current sensor on Mouser.  I am trying to see what the DC current resolution is, as well as what is the minimum current that it can measure.  The project I am working on have variable current between 1mA to 2A.  I also need a resolution of 0.1mA.  Would PmodISNS20 meet the requirements?  Thanks!

[jpeyron]

Hi @syu,

You can see the specs of the ACS722LLCTR-20AB on the datasheet here on the lower part of page 9. Sensitivity is 66 mV/ A. The range is -20 A to 20 A. 

thank you,

Jon

 

[JColvin]

Hi @syu,

I was checking at the same time as @jpeyron, but it looks like the resolution of the Pmod ISNS20 current sensing chip (link to manufacturers website for the ACS722) is 66 mV/A. So, if you were wanting to measure with a 0.1 mA resolution, that would equate to about 6.6 uV detection capabilities, which between the sensitive error of the current sensor and the resolution of the attached ADC (0.732 mV per LSB), the Pmod ISNS20 will not meet your needed capabilities.

Thanks,
JColvin