Using a Current Sense Resistor - 2021.2 English

Vivado Design Suite User Guide: Power Analysis and Optimization (UG907)

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2021.2 English

Inserting a Current Sense Resistor in series between the regulator output and the device creates a small voltage drop which, by Ohm’s Law, is proportional to the flowing current. Measuring this voltage through an XADC/SYSMON gives you the current being supplied to the device. To understand the connections needed to obtain the desired accuracy of measurements, refer to the user guide of the respective device family, Versal ACAP System Monitor Architecture Manual (AM006), UltraScale Architecture System Monitor User Guide (UG580), and 7 Series FPGAs and Zynq-7000 SoC XADC Dual 12-Bit 1 MSPS Analog-to-Digital Converter User Guide (UG480) (also known as the XADC User Guide). See Driving the Xilinx Analog-to-Digital Converter (XAPP795) for more information on how to use a current sense resistor.