Renesas EK-RA4E2 - Power; Power Supply Options; Figure 8. Power Supply Options; Figure 9. Test Point Location

Renesas RA Family EK-RA4E2 v1 – User's Manual
R20UT5175EG0300 Rev. 3.00 Page 14 of 30
Feb.27.23
5.1 Power
The EK-RA4E2 kit is designed for +5 V operation. An on-board Low Dropout Regulator (LDO) is used to
convert the 5 V supply to a 3.3 V supply. The 3.3 V supply is used to power the RA MCU and other
peripheral features.
5.1.1 Power Supply Options
This section describes the different ways in which EK-RA4E2 kit can be powered.
Option 1:
Debug USB
(J10)
Option 3a:
TP7 and TP9
Option 3b:
J31
5 V to 3.3 V
Voltage
Regulator
Main System
5 V power
3.3 V Voltage
Measurement:
TP8 and TP10
Main System
3.3 V Power
MCU Current
Measurement:
TP1 and TP3
RA MCU
Option 2:
USB FS
(J11)
Figure 8. Power Supply Options
5.1.1.1 Option 1: Debug USB
5 V may be supplied from an external USB host to the USB debug connector (J10) labelled DEBUG1 on the
board. Power from this source is connected to the main system 5 V power. Reverse current protection is
provided between this connector and the main system 5 V power.
5.1.1.2 Option 2: USB Full Speed
5 V can be supplied from the USB Full Speed connector (J11). Reverse current protection is also provided
between this connector and the main system 5 V Power.
5.1.1.3 Option 3: 5 V Input Test Points or 2-pin Header J31
5 V may be supplied from an external power supply to test points on the board. TP7 (5 V) and TP9 (GND)
are loop-style test points, and J31 Pin2 (5 V) and J31 Pin1 (GND) are through hole test points. The two types
of test points are electrically equivalent, and both are provided for user convenience. Power from this source
is connected to the main system 5 V power. Reverse current protection is provided between the 5 V test
points and the main system 5 V power. These test points can be found at the top left of the board above
Pmod 1.
A standard 0.1” header plug can be fitted to J31 so that the board can be powered this way.
Figure 9. Test Point Location