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INA223EVM Software Overview
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5.2.2 Output Mode
The output mode configuration allows the user to toggle between different output signals generated from
the INA223, and is shown in the red box of
Figure 17 . The four options available for output mode are:
Shunt Voltage, Bus Voltage, Supply Power, and Load Power.
Figure 17. Configuring the Output Mode
The two power output modes of the INA223EVM is used to select whether the signal representing the
power being supplied by the power supply or the power being consumed by the load is made available at
the output pin. When the Supply Power option is selected, the V
BUS
measurement is taken internally at the
VIN+ pin of the INA223 and combined with the V
SHUNT
measurement to calculate the power being supplied.
The Load Power option operates in a similar manner to the Supply Power option, except that the V
BUS
measurement is taken internally at the VIN– pin of the INA223. The power being consumeed by the load
is found by taking the V
BUS
measurement from the VIN– pin. The Supply Power and Load Power results
are very similar with the exception being that the Load Power option removes the power being dissipated
across the shunt resistor from the result. At high current shunt gains, the differences between Load Power
and Supply Power are negligible. At low current shunt gains, the power dissipated across the sense
resistor can result in a noticeable difference between these two results.
16 INA223EVM User’s Guide and Software Tutorial SBOU125 – June 2012
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