2
DP83640 DEMO BOARD USER GUIDE
2
Quick Start
The DP83640 Demo Board is fully assembled and factory tested. Follow the instructions below to
set up the hardware platform for the measurement of interest.
2.1
Power Connection
The DP83640 Demo Board provides several options for supplying power to the board. Power
can be supplied by way of the MII interface at 3.3 V or 5.0 V, USB interface, or directly from an
external supply.
2.1.1 MII Interface (Default)
To allow the board to be supplied by the MII interface a 0 ohm resistor must be inserted at R139.
Placing the jumper between J11 and pin 2 of J12 will connect the 3.3 V power plane to the MII
3.3V supply. In the case of an MII interface that supplies 5.0 V, an on board 3.3 V regulator is
provided and no jumper should be placed on J55. For a 3.3 V MII supply, a jumper should be
placed on J55 to bypass the regulator. In both cases, LED D2 will illuminate if a voltage is
available at J11. The following image shows the default jumper configuration.
Figure 1. Default Power Supply Connection
2.1.2 USB Interface
To supply the device using the USB interface, a jumper should be placed between pins 2 and 3 of
J12.
2.1.3 External Supply
The board can be supplied from an external supply by removing the jumper on J12 and
connecting the external 3.3 V supply directly to pin 2 of J12. Ground can be connected to one of
the GND pins on the board.
