Digilent chipKIT Uno32 Reference Manual

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Revision: July 17, 2012
Note: This document applies to REV C of the board.

Overview

The chipKIT Uno32 is based on the popular
Arduino™ open-source hardware prototyping
platform and adds the performance of the
Microchip PIC32 microcontroller.

The Uno32 is the same form factor as the
Arduino Uno board and is compatible with
Arduino shields. It features a USB serial port
interface for connection to the IDE and can be
powered via USB or an external power supply.

The Uno32 board takes advantage of the
powerful PIC32MX320F128 microcontroller.
This microcontroller features a 32-bit MIPS
processor core running at 80Mhz, 128K of
flash program memory and 16K of SRAM data
memory.

The Uno32 can be programmed using the
Multi-Platform Integrated Development
Environment (MPIDE), an environment based
on the original Arduino IDE modified to support
PIC32. It contains everything needed to start
developing embedded applications.

In addition, the Uno32 is fully compatible with
the advanced Microchip MPLAB® IDE and the
PICKit3 in-system programmer/debugger.

The Uno32 is easy to use and suitable for both
beginners and advanced users experimenting
with electronics and embedded control
systems.

The Uno32 provides 42 I/O pins that support a
number of peripheral functions, such as UART,
SPI, and I2C ports and pulse width modulated
outputs. Twelve of the I/O pins can be used as
analog inputs or as digital inputs and outputs.

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Features include:

• Microchip® PIC32MX320F128H
microcontroller (80 Mhz 32-bit MIPS,
128K Flash, 16K SRAM)

• compatible with many existing
Arduino code samples and other
resources

• Arduino Uno form factor

• compatible with many Arduino shields

• 42 available I/O pins

• two user LEDs

• PC connection uses a USB A > mini

B cable (not included)

• 12 analog inputs

• 3.3V operating voltage

• 80Mhz operating frequency

• 75mA typical operating current

• 7V to 15V input voltage

(recommended)

• 20V input voltage (maximum)

• 0V to 3.3V analog input voltage range

• +/-18mA DC current per pin

Doc: 502-209 page 1 of 17

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chipKIT Uno32 Reference Manual

chipKIT Uno32 Hardware Overview

The Uno32 has the following hardware features:

1. USB Connector for USB Serial Converter

This connects to a USB port on the PC to provide the communications port for the MPIDE
to talk to the Uno32 board. This can also be used to power the Uno32 board when
connected to the PC.

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chipKIT Uno32 Reference Manual

2. JP3 – Microchip Debug Tool Connector

This connector is used to connect Microchip programmer/debugger tools, such as the
PICkit™3. This allows the Uno32 board to be used as a traditional microcontroller
development board using the Microchip MPLAB® IDE.

3. J4 – External Power Connector

This is a 5.5mm x 2.1mm barrel connector used to power the Uno32 board from an
external power supply. It is wired with the center terminal as the positive supply voltage.
The power supply voltage must be in the range 7V to 15V.

4. Power Supply – 3.3V Regulator

Voltage regulator for the 3.3V power supply. This power supply can provide up to 500mA
of current.

5. JP2 – Power Select Jumper

This jumper is used to route power from the external power connector through the on­board 5V voltage regulator or to bypass the 5V regulator. The REG position routes power
through the 5V regulator. The BYP position bypasses the on-board 5V regulator. With this
jumper in the BYP position the maximum input voltage that can be applied at the external
power connector is 6V.

6. Power Supply – 5V Regulator

This on-board 5V voltage regulator regulates the input voltage applied at the external
power connector to 5V. This is used to power the 3.3V regulator and to provide 5V power
to expansion shields. This regulator can provide up to 800mA of current.

7. J2 – Shield Power Connector

This connector provides power to I/O expansion shields connected to the board.

8. PIC32 Microcontroller

The PIC32MX320F128H microcontroller is the main processor for the board.

9. J7 – Analog Signal Connector

This connector provides access to analog/digital I/O pins on the microcontroller.

10. JP6/JP7 – A4/A5 Signal Select Jumpers

These jumpers are used to switch pins 9 and 11 on connector J7 between analog inputs
A4 and A5 or the I2C signals SDA and SCL.

11. J8 – SPI Signal Connector

This connector provides alternative access to the SPI signals. This is used by some
shields for access to the SPI bus.

12. JP5/JP7 – SPI Master/Slave Select Jumpers

These jumpers are used to switch the SPI signals for use of the Uno32 board as an SPI
master device or as an SPI slave device. Both jumpers should be switched together. Place
the shorting blocks in the MASTER position for master operation and in the SLAVE
position for slave operation. Normally, these jumpers are in the MASTER position.

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chipKIT Uno32 Reference Manual

13. User LEDs

Two LEDs connected to digital signal pins 13 and 43.

14. J6 – Digital Signal Connector

This connector provides access to digital I/O pins on the microcontroller.

15. JP4 – Pin 10 Signal Select Jumper

This jumper is used to switch connector J5 pin 5 (digital signal 10) between pulse width
modulator (PWM) operation and SPI operation. The jumper is placed in the RD4 position
for PWM output and in the RG9 position for SPI slave operation. The shorting block on this
jumper will normally be in the RD4 position. The only time it normally needs to be in the
RG9 is when using the Uno32 board as an SPI slave device.

16. J5 – Digital Signal Connector

This connector provides access to digital I/O pins on the microcontroller.

17. Communications Status LEDs

These LEDs indicate activity on the USB serial interface.

18. Reset Button

This button can be used to reset the microcontroller, restarting operation from the boot
loader.

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chipKIT Uno32 Reference Manual

Jumper

Function

POWER SELECT:

Note:

Note:

PWM/

SPI SLAVE

:

chipKIT Uno32 Jumper Settings

The chipKIT development platforms use a Microchip PIC32 microcontroller. These are 32-bit
products that bring unprecedented features to the Arduino community. In order to maintain
compatibility with existing hardware and software, additional jumpers and row headers are
provided. This document describes the functionality of the jumpers listed in the figure below.

chipKIT Uno32 Jumpers

JP2

using an external power supply connected to J4.

J4 supply is regulated (i.e., 5V will be

present on 5V pin)

To protect the PIC32 MCU, a 3.3V on-board regulator will always be

enabled regardless of JP2 settings.

If you’re not sure what POWER SELECT does, be safe and keep JP2 on

the two right-most pins so the J4 supply is regulated.

JP4

Slave Select input for use as an SPI slave device.

Pin 10 configured as an SPI SS input Pin 10 configured as a PWM output

Used to connect/bypass the on-board 5V regulator when

J4 supply bypasses regulator (i.e.,

Supply voltage will be present on 5V

Configures pin 10 on J5 to be used as a PWM output or a

pin)

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chipKIT Uno32 Reference Manual

SPI SELECT:

I2C/

ANALOG PIN SELECT:

JP5/JP7

Used to configure the chipKIT as either a Master or Slave when
using the SPI. The chipKIT board can be connected to another device or even
another chipKIT through the SPI connector (J8).

chipKIT configured as an SPI Master

chipKIT configured as an SPI Slave

For more information on SPI, please visit Wikipedia’s SPI page:
http://en.wikipedia.org/wiki/Serial_Peripheral_Interface_Bus#Mode_Numbers

JP6/JP8

Used to configure A4 and A5 for functionality as an

Analog input or to be used as I2C communication pins.

A4 and A5 on J7 are configured to

be used as analog inputs

A4 and A5 are configured to be used as

I2C communication lines (A4 – SDA, A5 –

SCL )

For more information on I2C, please visit Wikipedia’s I2C page at:

http://en.wikipedia.org/wiki/I2C

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