Renesas RA Microcontrollers EK-RA4M1 v1 – User's Manual
R20UT4579EU0100 Rev.1.00 Page 13 of 32
Oct.02.19
Figure 14. E6 on the Evaluation Kit Board (Bottom side)
Once the shorting traces have been removed, there are several options to measure current:
• Pins can be installed that allow connection of a precision multi-meter or bench meter, or leaded current
shunt to allow oscilloscope or data logger connection. When not measuring the current, this allows easily
installed and removed shunts to be used to short the jumper terminals.
• Another option is to install current sense resistors between pads 1 and 3 for +3V3 MCU, and between
pads 2 and 4 for VBAT. Precision non-inductive film or foil resistors are recommended for use in this
application, and the value of each resistor should be carefully considered.
For example, if the expected current requirement for the +3V3 MCU supply voltage is 10 mA, and the
user would expect to measure a 10 mV drop across the current measurement resistor, then a 1.0-ohm
resistor should be selected and installed.
The actual value selected should be based on the operating conditions of the MCU for the specific user
application, and the sensitivity of the measurement equipment used.
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