User manual

DS40001804A-page 10  2015 Microchip Technology Inc.
Curiosity Development Board User’s Guide
1.3 POWER SOURCES
The Curiosity Development Board can be powered in one of three ways, depending on
its usage.
1.3.1 USB Connector (J2)
The USB connector (J2) will power the entire Curiosity Development Board. A shunt
jumper must be placed onto jumper J12 (Figure 1-2). The right two pins of J12 will
connect +5V from the USB connector J2. The left two pins of J12 will connect +3.3V
from the USB voltage regulator on the back side of the development board. With USB
power connected to J2, power LED D1 will always be ON to indicate that +3.3V is
available on the board.
1.3.2 9V External Power Supply (J15)
The 9V external power supply (J15) will also power the entire Curiosity Development
Board. A shunt jumper must be placed onto jumper J12 (Figure 1-2). The right two pins
of J12 will connect +5V from the on-board voltage regulator circuitry connected to
connector J15. The left two pins of J12 will connect +3.3V from the on-board voltage
regulator circuitry. With 9V external power connected to J15, power LED D1 will always
be ON to indicate that +3.3V is available on the board. Power LED D2 will only be ON
when power (+3.3V or +5V) is applied to V
DD via a shunt jumper placed on J12.
1.3.3 Variable External Power Supply (TP3, TP4)
A variable external power supply connected to TP3 and TP4 will power the entire
Curiosity Development Board. A shunt jumper is not needed on J12, thus either +3.3V
or +5V can be directly applied via a variable external power supply to V
DD.