Digilent MX4cK Manuel d'utilisateur télécharger pdf (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.

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Digilent MX4cK Manuel d'utilisateur Page 23