User manual

Explorer 8 Development Board User’s Guide
DS40001812A-page 26  2015 Microchip Technology Inc.
2.5 POWERING THE BOARD
The Explorer 8 Development Board can be powered-up in two ways: External 9V DC
supply and USB power.
2.5.1 External 9V Power Supply
To power-up the board using an external 9V power supply:
• Plug the 9V power supply to a wall outlet.
• Connect the 9V power supply to the board through the barrel connector placed on
the lower left corner of the board.
• Place J2 in the position shown in Figure 2-6.
FIGURE 2-6: USING THE 9V EXTERNAL SUPPLY
One of the on-board regulators will reduce this voltage to 5V which can be measured
through Test Points TP1 and TP7. For 3.3V, the 5V output will be further reduced
through a 3.3V regulator. Make sure to attach J24 before measuring the 3.3V output at
TP6. The board also supports other voltage values through an adjustable voltage
regulator. The variable voltage can be measured through TP5. For more details on
varying the voltage values, see Section
Section 2.6 “Selecting Vdd Values”.
2.5.2 USB Power
The Explorer 8 Development Board can also be powered through USB. The board will
draw +5V power from a host device such as a PC by connecting a USB cable between
the on-board micro USB socket and the PC’s USB port. The micro USB cable is
included in the Explorer 8 Development Kit.
Figure 2-7 shows how to connect the USB cable to the micro USB socket and J2 setting
for USB-powered configuration.
FIGURE 2-7: USB-POWERED BOARD CONFIGURATION
J2
J
USB
+5V
BRD
+5V
9V DC
J2
USB
+5V
BRD
+5V
To PC
USB Port