System Control And Ecosystem Access; Power - Renesas RA4 Series User Manual

Renesas RA Family
Location Circuit Group
2
E7 I C SCL0
2
E8 I C SDA0
E9 LED2
E10 LED1
E11 MCU Power
E12 MCU Clock
E13 MCU Clock
E14 MCU Power
E15 MCU Clock
E16 MCU Power
E17 MCU Clock
E18 MCU Power
E19 MCU Power
E20 MCU Clock
E21 MCU Power
E22 MCU Clock
E23 MCU Clock
E24 MCU Clock
E25 MCU Power
E26 MCU Power
E28 Debugger
E29 Switch S1
E30 Debugger
J7 MCU Boot Mode
R3 MCU Power

5. System Control and Ecosystem Access

The FPB-RA4E1 provides a power supply regulator, an on-board debugger, simple I/O (switches and LEDs),
and popular I/O ecosystem connectors. These are all described in detail below.

5.1 Power

The FPB-RA4E1 board is designed for +5 V operation. An on-board Low Dropout (LDO) regulator 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.
R20UT4958EG0100 Rev 1.00
Sep.07.21
Default Function
Open/Closed
Closed Connects SCL0 (P400) to 2.2K pull-up R1
Closed Connects SDA0 (P401) to 2.2K pull-up R2
Closed Connects LED2 to P407
Closed Connects LED1 to P408
Closed Connects AVCC0 (MCU pin 56) to VREFH (MCU pin 55)
Closed Connects (J3 pin 14) to MCU pin 10 (P212/EXTAL)
Open Connects 24MHz crystal to MCU pin 10 (P212/EXTAL)
Closed Connects AVCC0 (MCU pin 56) to +3.3 V
Open Connects 24MHz crystal to MCU pin 9 (P213/XTAL)
Closed Connects AVSS0/VREFL (MCU pin 57) to GND
Closed Connects J3 pin 13 to MCU pin 9 (P213/XTAL)
Closed Connects VREFLO (MCU pin 58) to AVSS0/VREFL
(MCU pin 57)
Closed Connects AVCC0 (MCU pin 56) to VREFH0 (MCU pin
59)
Closed Connects J3 pin 11 to MCU pin 7 (XCOUT)
Open Connects Arduino J1 pin 8 to VREFH0 (MCU pin 59)
Open Connects 32.768KHz crystal to MCU pin 7 (XCOUT)
Open Connects 32.768KHz crystal to MCU pin 6 (XCIN)
Closed Connects J3 pin 10 to MCU pin 6 (XCIN)
Open Bypass diode D1 to connect J3 pin 8 directly to MCU pin
4 (VBATT)
Closed Connects MCU pin 4 (VBATT) to +3.3 V
Closed Connects P201/MD to P300/TCK/SWCLK
Closed Connects User Switch 1 to MCU P205
Open Connects the debugger reset pin to ground to disable the
debugger
Open Configures the MCU for Single-chip mode
Closed Configures the MCU for SCI boot mode
Fitted Connects +3.3 V to MCU. Remove when testing MCU
current draw
FPB-RA4E1 v1 – User's Manual
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