Digilent MX4cK - Manual (Page 23)

Cerebot MX4cK Reference Manual
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J12
Power supply source select
This jumper is used to select the source of main board power.
Place a shorting block in the USB position to have the board powered from the USB device
connector, J15.
Place a shorting block in the EXT position to have the board powered from one of the
external power connectors, J13, J14, or J18.
Place a shorting block in the DBG position to have the board powered from the debug USB
connector, J9.
Place the shorting block in the URT position to have the board powered from the USB serial
converter connector, J8.
J13 External power connector
This is a 5.5mm x 2.5mm coaxial power connector wired center positive. This is used to
supply external power to the board.
J14 External power connector
This is a two pin header connector that can be used to supply external power to the board.
J15 USB OTG connector
This is a USB micro-AB connector that is used when the Cerebot MX4cK board is used to
implement a USB device, or USB OTG device.
J16 PIC32 pin 20 function select
Pin 20 on the PIC32MX460 microcontroller has multiple functions. It functions as the
VBUSON control pin when acting as a USB host. It can be used as an analog input for the
A/D converter or one of the analog comparators. It can also be used as a pin change
interrupt input or as a general digital i/o. This jumper is used to route pin 20 to one of three
places on the board:
Place a shorting block in the upper, VBUSON, position when acting as a USB host to control
the USB power supplied to the connected device.
Place a shorting block in the middle, DAC, position to connect the output of the MCP4725
digital to analog converter to pin 20. This allows the use of the DAC output as an input to
analog comparator #1.
Place a shorting block in the lower, JJ-8, position to connect pin 20 to Pmod connector JJ,
pin 8. This allows access to pin 20 from this Pmod connector.
J17 USB host connector
This is a standard USB type A connector. This is used to connect a USB device when the
Cerebot MX4cK is being used as a USB host.