I am using the MCP6N11-010 in a current sensing circuit (Battery charger). i would like the output of the INA to show the difference in inputs starting from 0v going up to VDD but cant seem to get the configuration correct. I initially just tied VREF to ground but got no incremental changes. I then decided to put VREF at VDD/2. SO the output to from the amp is at VDD/2 when the input are the same and then at (VDD/2)+ input difference * gain. This seems to work but is not what i want. Does anyone have an idea on how to achieve getting the reference to 0v ? Should i perhaps be trying the MCP6N11-100 version of the amp ?
Here are the schematics:
The above image is of the 0v ref voltage circuit, the one below is the ref voltage tied at vdd/2.