SLUSBX9I March 2014 – July 2019 TPS23861
Load current in each PSE port is sensed as the voltage across a low-end current-sense resistor with a value of 255 mΩ. Alternatively, a 250-mΩ resistor may be used. If a 250-mΩ sense resistor is used the M250 bit in the General Mask 1 Register must be set. For more accurate current sensing, kelvin sensing of the low end of the current-sense resistor is provided through pins KSENSA for ports 1 and 2, and KSENSB for ports 3 and 4. Figure 59 illustrates the kelvin-sensing scheme.