Digilent chipKIT DP32 Довідковий посібник - Сторінка 6
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chipKIT™ DP32™ Board Reference Manual
The minimum high-voltage output of the PIC32 microcontroller is rated at 2.4V when sourcing 12mA of current.
When driving a high impedance input (typical of CMOS logic), the output high voltage will typically be close to
3.3V. Some 5V devices will recognize this voltage as a logic high input, and some will not. You will have to read the
datasheet for the 5V parts you are using to ensure that 3.3V will satisfy the logic high conditions for the part. Many
5V logic devices will work reliably with 3.3V inputs.
4.3
Input/Output Connections
The DP32 board provides all 19 I/O pins of the PIC32MX250F128B microcontroller to through-hole points on the
PCB.
The PIC32 microcontroller can source 10mA with a minimum VOH of 3V and sink 15mA with a maximum VOL of
.4V on all digital I/O pins. The maximum current that can be sourced or sunk across all I/O pins simultaneously is
+/- 200mA. For more detailed specifications, refer to the PIC32MX1XX/2XX Data Sheet available from the
Microchip web site.
The DP32 uses logical pin numbers to identify digital I/O pins. Pins 0 through 8 are located on J4, counting up from
the square pad of J4. Pins 9 through 18 are located on J3, counting up from the square pad. In addition, several of
these I/O pins share functionality with other devices on the board. See table 1 in appendix A for more information.
Pins 15 and 16 are shared with the crystal for the internal oscillator, and are not typically usable. Pin 6 is shared
with the Analog Temperature Sensor. Pin 8 is shared with the onboard Potentiometer. Pins 4 and 5 are shared with
the USB Data+ and Data- signals. Pin 0 is shared with the USBID function, but removing jumper 1 clears this
conflict. Pins 9, 18, 7, and 10 are used for the SPI EEPROM device if it is loaded, on its Chip Select, Master
Out/Slave In, Serial Clock, and Master In/Slave Out lines respectively.
In addition to the digital I/O, there are Analog inputs available on the board, called A0 through A8. These pins are
shared on digital pins 6 through 14.
4.4
Peripheral I/O Functions
2
I
C: Synchronous serial interface. The I2C1 interface is available on pins 2 and 3. When using the I
necessary to set JP4 and JP5 such that pull-ups are present on the bus. This is accomplished by moving the jumpers
to pins 2 and 3 on each jumper, the default setting.
User LEDs: Pins 11 (LD4), 12 (LD3), 13 (LD2), and 14 (LD1) are shared between the through-hole connection and the
LED. Driving the pin high turns the LED on, driving it low turns it off.
User Buttons: Pins 1 (BTN3) and 17 (BTN2/PGM) are shared between a through-hole connection and a push
button. Pushing the button drives the input high. Releasing it brings the input low.
External Interrupts: Only INT0 is hard-mapped on the microcontroller. It is connected to pin 1. The other external
interrupts are accessible via PPS described below.
Reset: The Reset button is utilized to bring the MCLR pin low on the microcontroller, thus restarting the currently
loaded sketch. If the user wishes to reprogram the device, refer to section 3.1 for program mode instructions.
4.5
Peripheral Pin Select
An advanced feature of the PIC32MX1xx/2xx family of microcontrollers is the ability to re-map the locations of
peripheral devices. MPIDE does the default mapping.
Copyright Digilent, Inc. All rights reserved.
Other product and company names mentioned may be trademarks of their respective owners.
2
C interface, it is
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