Renesas RA Family EK-RA4M2 v1 – User's Manual
R20UT4815EG0100 Rev 1.00 Page 27 of 30
Jan.04.21
7.2 MCU and USB Current Measurement
Included in the Native Pin Access area are current measurement resistors and test points to measure the
MCU USB controller current and the MCU core power current.
The EK-RA4M2 board provides precision 5 mΩ resistors (Vishay, part number WSLP08055L000FEA18) for
current measurement of the main 3.3 V MCU power, and the 3.3 V USB MCU power. Measure the voltage
drop across these resistors and use Ohm’s Law to calculate the current. For convenience, TP1 and TP3 are
provided to measure the main 3.3 V MCU power, and TP2 and TP4 are provided to measure the 3.3 V USB
MCU power. See Figure 26 for the location of TP1, TP3, TP2 and TP4.
Figure 24. RA USB Current Measurement Circuit
Figure 25. RA +3.3 V Current Measurement Circuit
Figure 26. RA MCU Current Measurement
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