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Datasheet of TDGL004 - BOARD CEREBOT 32MX7 PIC32MX795
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Cerebot 32MX7 Reference Manual
www.digilentinc.com
page 3 of 19
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32MX7 is designed to use PGC1/PGD1.
Because of this, it is necessary to select the
use of PGC1/PGD1 for the debugging
interface. This is done using configuration
variables set using the
#pragma config
statement. The following statement must be
used to configure the microcontroller for use
with the on-board licensed debugger circuit:
#pragma config ICESEL = ICS_PGx1
The MPLAB IDE may report an error indicating
that the device is not configured for debugging
until a program containing this statement has
been programmed into the board.
Board Power Supply
Switch SW1, in the lower left corner 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.
There are three power options for main power
to the board: USB powered from the debug
USB connector, USB powered from the USB
device connector, or external, non-USB
powered. Jumper block J16, (above the
Ethernet connector, J11) is used to select the
main power source. To select USB powered
from the debug connector, place the shorting
block in the DBG position. To select USB
power from the USB device connector, place
the shorting block in the USB position. This
option is used when the board is being used to
implement a bus powered USB device. To
power the board from an external power
supply, place the shorting block in the EXT
position. The board comes from the factor
jumpered for USB power from the debug USB
connector.
When powering the board from an external
power supply, there are two power supply
connectors that can be used: J17 and J18.
The barrel connector, J17, is used to power the
board from a “wall wart” style power supply.
This type of power supply is available from
many sources. Digilent has an optional power
supply available, the 5V Switching Power
Supply, that can be used with connector J17.
Connector J17 is a 2.5mm x 5.5mm coaxial
connector wired with the center terminal as the
positive voltage.
Connector J18 is a screw terminal connector
for an alternative power supply connection for
use with battery packs, bench supplies or other
power sources where use of a hard wired
power supply is desirable.
The Cerebot 32MX7 is rated for external power
from 3.6 to 5.5 volts DC. Using a voltage
outside this range will damage the board and
connected devices. For most purposes, when
using external power, a regulated 5V supply
should be used. When operating the board
from an external supply with a voltage less
than 5V, some features of the board won’t
work correctly.
When the Cerebot 32MX7 is operating as a
USB host, an external power supply connected
to either J17 or J18 must be used to power the
board. In addition to powering the logic on the
Cerebot 32MX7 board, this supply provides the
USB bus voltage supplied to any connected
USB device and must be a regulated 5V with
at least 500mA current capability to meet the
USB specifications.
The CAN bus operates at 5V, and therefore
the transceivers for the two CAN interfaces
require 5V to operate correctly and within the
CAN specification. When using the CAN
network interfaces, the board should be
operated from a 5V supply if using an external
power supply.
Connectors J17, and J18 are wired in parallel
and connect to the “External Power” position
(center position) on the Power Select jumper
block J16. A shorting block should be placed
on the “EXT” position of J16 when using this
option for board power. Only one of the
external power connectors should be used at a
time. If multiple power supplies are connected
simultaneously, damage to the board or the
power supplies may occur.
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