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RL78/G22 Fast Prototyping Board
5.17
Current Measurement Header
This header (J11) is used to measure the current drawn by the evaluation MCU (J11 header components are
not mounted). Connecting an ammeter to this product enables measurement of the current being drawn by the
evaluation MCU. Take care to cut the given pattern for cutting (VDD) if this header is to be used. Figure 5-9
shows the positions of the current measurement header and pattern for cutting.
Current
measurement
header (J11)
(VDD pin side of pin
48 of the MCU)
Figure 5-9 Positions of the Current Measurement Header (J11) and Pattern for Cutting (VDD)
Insert an ammeter between the sockets of the current measurement header (J11) to measure the current. Cut
the pattern for cutting (VCCIO) (Figure 5-11) and turn down the LED to reduce the current drawn with an MCU
other than the evaluation MCU.
Figure 5-10 is a block diagram of the power-supply lines related to the measurement of current drawn. For a
block diagram of the power-supply circuit as a whole, refer to Figure 6-2.
VDD
VDD
J11
Figure 5-10 Block Diagram of the Headers Related to Current Measurement
R20UT5121EJ0100 Rev. 1.00
Nov.16.22
Top side
FTDI
Soldered side
RL78/G22
VDD
P62
P63
VCCIO
5. User Circuits
Pattern for cutting
(VDD)
P62
P63
VDD
Page 23 of 35
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