TMCS1107: What is the minimum current that TMCS1107A4B can detect?

Hello Fengyu,

Thank you for your post. 

How low of current are you trying to measure and what is the range of currents that you will measure? 

As you decrease the level of input current, you increase the amount of error that you will see from the device. 

For example, input offset error doubles when halving the input current in the top row of the table. 

If you tell me what current you are trying to measure, I can run the calculations for your expected error. 

Or you can take a look in the datasheet and work through the calculations for your system.

I hope this helps, 

Joe