Renesas RA Microcontrollers EK-RA6M2 v1 – User's Manual
R20UT4578EU0102 Rev.1.02 Page 12 of 32
Jul.29.20
Figure 11. LED2 on the Evaluation Kit Board (Top Side)
5.2.3 Battery Supply Configuration
An external battery may be connected according to the methods outlined in section 5.2.1, Power Supply
Options, providing that it meets the minimum voltage and current requirements.
Additionally, an external battery source may be connected to VBAT at Pin Header location J2-29 (J2-12
ground return) to maintain the MCU Realtime Clock (RTC) when other main power sources are disconnected
from the EK-RA6M2 board.
5.2.4 Measuring Current Consumption
Pads 1 and 3 of the copper jumper E6, which is a dual trace-cut jumper, allow measurement of +3V3 MCU
supply current. Pads 2 and 4 of E6 allow measurement of VBAT supply current. Both traces are connected
by default. These traces should be cut to enable power measurement. Care must be taken when cutting the
trace to not cause damage to PCB layers below the trace.
The actual current consumed by the RA6M2 MCU is dependent on many factors, including ambient
temperature, internal clock speed, input voltage level, and device activity. The actual current consumed by
the MCU can vary from less than 1 mA to nearly 40 mA. For more information on the electrical
characteristics of the MCU, see the RA6M2 Microcontroller Group User’s Manual.
Figure 12. MCU Current Measurement Circuit
Figure 13. E6 on the Evaluation Kit Board (Top side)
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