Microchip Technology SAM R30 Xplained Pro User Manual page 23

Design
ator
R329
R109
R325
Figure 4-4. Assembly Drawing Bottom
4.5.1 Operating at Other Voltages
The SAM R30 Xplained Pro board operates at 3.3V by default, but it is also possible to run the board at
lower voltages from an external supply. The EDBG is designed to run from a 3.3V supply and won't work
on other voltages; therefore, all connections from the EDBG and from the on-board 3.3V regulator to the
ATSAMR30G18A SoC should be removed.
To completely disconnect the EDBG and the on-board power supply from the ATSAMR30G18A SoC, do
the following:
• Remove the two jumpers from the on-board 3-pin current measurement headers (J101 and J102),
and connect the two center pins (pin 2) together with a wire or an ammeter as shown in
• Remove R109, R310, R311, R312, R313, R314, R315, R316, R317, R318, R319, R320, R321,
R322, R323, R324, R325 and R329.
Figure 4-5
at other voltages. To locate the components to be removed, see the assembly drawing in the section
above. When the components are removed, the kit can be supplied with a desired voltage through the
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2017 Microchip Technology Inc.
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Value From
0R TARGET VUSB DETECT PA07 ADC7
47K VCC_P3V3_CM_IN
0R RESET
shows all components that have to be removed from the bottom side of the PCB for operating
To Comment
Used to detect if a USB cable is
connected to the TARGET USB
connector.
TARGET VOLTAGE Used in the voltage divider
network to detect the target
voltage of 3.3V.
TARGET RESET Reset sense signal to EDBG,
SENSE used to detect external resets.
User Guide
ATSAMR30-XPRO
Figure 4-6
DS50002612A-page 23