Datasheet

ADM1177 Data Sheet
Rev. C | Page 22 of 24
KELVIN SENSE RESISTOR CONNECTION
When using a low value sense resistor for high current
measurement, the problem of parasitic series resistance can arise.
The pad and solder resistance can be a substantial fraction of
the rated resistance, making the total resistance larger than
expected. This error problem can be largely avoided by using a
Kelvin sense connection. This type of connection separates the
high current path through the resistor and the voltage drop across
the resistor. A four pad resistor can be used or a split pad layout
can be used with a two pad sense resistor to achieve Kelvin sensing.