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RH850/U2A 292pin
3. Power Supply
3.1
Board Power Connection
The device and the board require various power supply voltages:
•
3.3 V for most of the digital circuitry on the device and on the board
•
5 V in case some ports shall be operated with 5 V I/O voltage
•
1.12 V for the device's VDD core voltage supply
Refer to 3.3 Device Core Voltage (VDD) Selection for further details about VDD voltage.
Note
Within this document all voltage values are considered as 'typical'.
Refer to the 'Electrical Characteristics' section of the Hardware User's Manual for allowed voltage ranges.
The following connectors are available to supply external voltages:
Four 4 mm 'banana-type' connectors are used to connect external power supplies:
•
−
black connector CN8 for GND (VSS)
−
red connector CN9 for 5 V
−
red connector CN10 for 3.3 V
−
red connector CN11 for 1.12 V
Refer to 3.3 Device Core Voltage (VDD) Selection for further details about VDD voltage.
These connectors are not assembled at delivery of the board, but separately supplied with the board package.
In case the piggyback board is mounted on a Main Board, all voltages except for 1.12 V (VDD) are supplied by the
Main Board.
CAUTION
Do not supply the 5 V (CN9) and 3.3 V (CN10) voltage directly to the piggyback board in case it is
mounted on the Main Board.
Connecting external 1.12 V via CN11 (and GND via CN8) is still an option also in this case.
For some general power supply scenarios, the jumper settings are described in 8 Jumper Configuration Examples.
R20UT4545ED0102 Rev.1.02
May 27, 2021
3. Power Supply
Page 17 of 58
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