Digilent chipKIT DP32 Manuel de référence - Page 5
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chipKIT™ DP32™ Board Reference Manual
Using the Microchip development tools to program the DP32 board will cause the boot loader to be erased. To use
the board with the MPIDE again, it is necessary to program the bootloader back onto the board. The boot loader
image can be downloaded from the DP32 product page on the Digilent website.
4
chipKIT DP32 Jumper Settings
JP1
USBID Connect (USB OTG)
Loaded: USBID is connected to Digital I/O pin 0 (RB5) and is usable by the microcontroller.
Unloaded: Pin 0 is unconnected to USBID and freely usable.
JP2
USB Data+
JP3
USB Data-
For most users, these traces should be left uncut. Cutting the trace will remove the ability to program the
microcontroller from the USB Port. Users may optionally add jumper pins and a shorting block to restore the
original functionality of the DP32 if the traces have been cut.
JP4/JP5
Default configuration is with the shorting blocks loaded on pins 1 and 2, which results in pull-up configuration.
Shorting pins 2 and 3 results in pull-down operation. Users may choose to remove shorting blocks entirely if no
pull-up/pull-down settings are desired.
JP7 Power Select Jumper
Default power is selected with the shorting block connecting the two pins labeled VBUS, providing power from the
USB connector. If external power is desired, connect the two pins labeled VIN.
4.1
Power Supply
The DP32 is designed to be powered either via USB or from an external power supply. Only one supply should be
selected at a time. A power-on LED has been added to the power supply circuit.
The DP32 has a single voltage regulator which regulates either 5V from USB to 3.3V, or a maximum of 15V external
voltage to 3.3V. The 3.3V regulator is a Microchip MCP1703. This regulator is rated for a maximum output current
of 250mA. The absolute maximum input voltage for the MCP1703 is 16V. This regulator has internal short circuit
protection as well as thermal protection. It will get noticeably warm when the current consumed by the VCC3V3
bus is close to the 250mA maximum.
4.2
5V Compatibility
The PIC32 microcontroller operates at 3.3V. There are two issues to consider when dealing with 5V compatibility
for 3.3V logic. The first is protection of 3.3V inputs from damage caused by 5V signals. The second is whether the
3.3V output is high enough to be recognized as a logic high value by a 5V input.
Only MIPDE pin numbers 0 - 3 on the PIC32 microcontroller are 5V tolerant, all other pins are 3.3V tolerant only.
To provide 5V tolerance on those pins, you will have to add clamping diodes and current limiting resistors to those
pins. Please check the table 1 in appendix A to confirm 5V tolerant pins.
Copyright Digilent, Inc. All rights reserved.
Other product and company names mentioned may be trademarks of their respective owners.
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