Digilent 410-295P-KIT - Manual (Page 7)

ChipKIT Pro MX4 Reference Manual
Copyright Digilent, Inc. All rights reserved.
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Page 7 of 37
2.3 Additional Tools Information
For additional information about the ChipKIT Pro MX4 board and the use and operation of the PIC32MX460F512L
microcontroller, refer to the following documents in addition to this reference manual.
The ChipKIT Pro MX4 Schematic, available on the ChipKIT Pro MX4 product page on the Digilent web site:
www.digilentinc.com
The PIC32MX3XX/4XX Family Data Sheet and the PIC32MX Family Reference Manual available from the Microchip
web site: www.microchip.com
Additional reference material for the MPIDE system is included in the MPIDE software download, and on-line in
the chipKIT wiki. Help with questions and problems using the board with the MPIDE software can also be obtained
in the chipKIT forums:
www.chipKIT.net/install (software download)
www.chipKIT.net
www.chipKIT.org/forum
3 Power Supply
Switch SW1, on the left side of the board is the power switch. Place this switch in the ON position to turn on board
power and in the OFF position to turn off board power.
The ChipKIT Pro MX4 may be USB powered via either the USB debug port, the USB UART port, or the USB device
port. Alternatively, the board may be powered via dedicated, “external”, power supply connectors.
Jumper block J12 is used to select the power source used to provide power to the board. This jumper block
provides the following four positions:
• USB – power is supplied by USB device connector J15. This is used when the ChipKIT Pro MX4 is used to
implement a USB bus powered device.
• EXT – Power is supplied by one of the external power connectors.
• DBG – Power is supplied by DEBUG USB connector J9.
• URT – Power is supplied by UART USB connector J8.
Place the shorting block in the appropriate position on J12 for the desired power source for the board.
The ChipKIT Pro MX4 is rated for external power from 3.6 to 12 volts DC. Using a voltage outside this range could
damage the board and connected devices. If operating the board at a voltage greater than 5V, it is necessary to
remove the shorting block on jumper JP10 to protect the USB load switch, which is limited to a maximum voltage
of 5.5V. The USB load switch is used to control bus power when the ChipKIT Pro MX4 is being used to implement a
USB host. When operating from any of the three USB sources, the input voltage will be 5V.
The output of power select jumper block J12 is connected to the VIN power bus. The VIN power bus supplies
power to Q3, a PFET load switch, and IC9, the voltage regulator for the licensed debugger circuit. The licensed
debugger circuit is powered as soon as the power switch is turned on. Power to the rest of the board is controlled
by Q3. The main board power supply is enabled by bringing the gate of Q3 low. When Q3 is turned on, the
unregulated power bus BRD_VU is powered.