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RL78/G1M Fast Prototyping Board
6. Handling Precautions
6.1
Power to be Supplied
The maximum current that the power-supply IC (ISL9005AIRNZ-T from Renesas) can supply is 300 mA
during operation at 3.3 V.
If power is to be supplied to this product via the USB, take care with the regard to the load that the USB-power
source is capable of driving.
6.2
Remodeling the Board
Any modification of the board (including removing the patterns for cutting) shall be conducted at the user's
own responsibility.
6.3
Limitation on the Number of Connected RL78/G1M Fast Prototyping Boards
Connecting the same host PC to multiple RL78/G1M Fast Prototyping Boards is not possible.
6.4
Power-Supply Circuits and Usage Conditions
Different power supplies can be selected by changing the jumper settings or remodeling the board. Table 6-1
shows the relationship between power-supply circuits and usage conditions. Figure 6-1 is a block diagram of
the power-supply circuit.
Table 6-1 Power-Supply Circuits and Usage Conditions
Usage
Power-supply
condition
selection
header
As shipped
VBUS (5 V)
(default)
3.3-V supply
3.3 V
External power
1-2: short-
supply (2.25 V
circuit
to 5.5 V)*
2
Notes: 1. Connecting the RL78/G1M Fast Prototyping Board to a board supported by an Arduino Nano shield shall be
conducted at the user's own responsibility and should only proceed after confirming the specifications of the
power supply and interfaces.
2. For remodeling the board, refer to section 5.11, External Power-Supply Header.
R20UT4797EJ0100
Rev.1.00
Jun.16.20
Operating
Products for 3.3-
voltage of the
V I/O operation
RL78/G1M
on the Arduino
Nano shield*
VBUS (5 V)
Not connectable
3.3 V
3.3 V
2.25 V to 5.5 V
Not connectable
Products for 5-V
I/O operation on
emulator and IDE
the Arduino
1
Nano shield*
1
VBUS (5 V)
Possible
Not usable
Not possible
2.25 V to 5.5 V
Not possible
6. Handling Precautions
Use of an
Page 14 of 27
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