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MT-DB-X3 Atmel AVR XMEGA 64-pin A3U / A3BU / C3 / D3 USB development board

Availability: In stock

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Quick Overview

Available with: ATxmega256A3U (new!), ATxmega128A3U, ATxmega256A3BU, ATxmega384C3, ATxmega384D3, ATxmega256C3, and ATxmega128C3. Available with or without optional level shifter and 5V regulator. USB device mode support on the A3U, A3BU, and C3 variants only.
Note that the DFU bootloader is not currently available for the 128c3,
even though it supports USB device mode (see here).

Shipping for all variants is now available worldwide.


The MT-DB-X3 is a development board for the 64-pin Atmel AVR XMEGA A3U, A3BU, C3, and D3 microcontrollers. It can be powered from USB, the PWR IN header, or from a 3V coin cell (CR2032 holder optional). The inputs have PTC resettable fuses (500mA) and schottky diodes. Voltage is regulated by the onboard 3.3V, 250mA, extremely low quiescent current (2uA) LDO regulator that supports up to 16V DC input. Optionally, a 5V, 500mA low quiescent current (23uA) LDO regulator can also be installed, which supports up to 24V input. Along with the 5V regulator, an 8-bit auto-direction sensing level shifter is installed, to provide level conversion between XMEGA Vcc and 5V (or 3.3V). Also mounted is a mini USB connector, green LED, 16MHz crystal, 32.768KHz RTC crystal, reset/user button, TWI (I2C) pullups, and a bootloader jumper. A USB DFU bootloader comes pre-installed (except D3). The board has 48 main dual inline header pins with 100 mil pin spacing and 900 mil row spacing which allows for mounting on a perfboard (or barely on a breadboard). There are 8 more pins available on an inboard header (PORT F). The PDI/SPI header can be used with an external programmer, or be reconfigured to be used as a SPI master or slave. There are 36 solder jumpers for configuration flexibility. The pcb measures approx. 2.9” x 1.1” (73mm x 28mm) and 0.062” (1.6mm) thick. There are 2 3mm mounting holes.


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*    Atmel AVR XMEGA A3U, A3BU, C3, or D3 64-pin microcontroller
            A3U, A3BU, and C3 variants support USB device mode
            32KB - 384KB FLASH, 4KB - 32KB SRAM, 2KB - 4KB EEPROM
            16 12-bit ADC channels (all variants), 2 12-bit DAC channels (A3U and A3BU)
            7 USART (6 for A3BU, 3 for D3 and C3), 2 SPI (3 for A3U), and 2 TWI (I2C)
            7 16-bit timers (5 for C3 and D3), 16-bit RTC (32-bit for A3BU) with ext. oscillator
*   Onboard 3.3V, 250mA LDO regulator
           Up to 16V DC input (reverse-polarity protected)
           extremely low quiescent current (2.0uA typical), 0.4% output tolerance typical
           low dropout (525mV typical @ 250mA, 725mV max. @ 250mA)
           Over-current and over-temperature protection
*   Onboard 5V, 500mA LDO regulator (optional)
           Up to 24V DC input (reverse-polarity protected)
           low quiescent current (23uA @100uA, 75uA @10mA, 0.7mA @100mA)
           low dropout (350mV @ 500mA)
           over-current protection, thermal shutdown
*   Auto-direction Sensing Level Shifter (optional)
           Converts from Vcc (usually 3.3V) to either 5V or 3.3V
           8 independent bi-directional bits connected to Port C (can be bypassed)
           Low power consumption (4uA max.), 15KV ESD (HBM)
           Can optionally control output enable (OE) from microcontroller
*   DFU (FLIP) bootloader preinstalled (except D3 variant)
*   2 PTC resettable fuses (500mA) for PWR IN + and Vbus
*   PDI/SPI header (PDI by default)
           As a PDI header, it is used to program the AVR with an external programmer
           Header can be converted to a SPI (master or slave) header
           Can mount the MT-SD MicroSD card slot directly to this header
*   16MHz crystal for main clock (use PLL for higher frequencies)
*   32.768KHz crystal for 16-bit RTC (32-bit battery-backed with A3BU)
*   CR2032 coin cell holder (optional) can power Vcc (all variants) or RTC (A3BU only)
*   Green Status LED (can be disconnected), bootloader jumper
*   Button configurable for reset or general use (pin F7) with optional debouncing
*   Mini USB connector for communications (except D3) and Vbus power (all variants)
*   USB pins routed to header pins (for panel-mount USB connector)
*   Ferrite bead and 2 capacitors on analog supply
*   36 solder jumpers on PCB bottom for configuration flexibility
*   All PORT pins routed to headers (except R0; and when using the A3BU, E6 and E7)
*   4 main headers are on 0.1” spacing relative to each other (breadboard/perfboard mounting)
*   Two 3mm mounting holes (~5mm pad)
*   High-quality PCB with gold-plated finish
*   Measures approx. 2.9” x 1.1” (73mm x 28mm) and 0.062” (1.6mm) thick


   User Guide


USB DFU Bootloader

  MT-DB-X3_DFU_Bootloaders_104.zip  Revision 104
MT-DB-X3_DFU_Bootloaders_104.zip contains the USB DFU bootloader that comes pre-installed. It is compatible with FLIP for Windows and dfu-programmer for Linux. More information can be found at http://www.atmel.com/images/doc8429.pdf and the User Guide

Blink Demo

MT-DB-X3_Blink.zip contains the blink demo hex file that comes pre-installed, as well as the source code. It simply blinks the LED at 1Hz using the 16MHz crystal as the clock source.



FLIP is a graphical utility for Windows used to load firmware into the XMEGA. FLIP supplies the USB DFU bootloader driver. Download FLIP 3.4.7 or higher from http://www.atmel.com/tools/flip.aspx and install. Older versions may not support the latest XMEGA variants (A3U or C3). Once FLIP is installed, the USB DFU drivers can be loaded. Install the boot jumper and power the board (or press reset). This will start the DFU bootloader. Windows will then prompt you for the driver, which is located in the Program Files/Atmel/Flip 3.4.7/usb directory. Point the installer to that directory and install.


This development board/kit is intended for use for FURTHER ENGINEERING, DEVELOPMENT, DEMONSTRATION, OR EVALUATION PURPOSES ONLY. It is not a finished product, and may not (yet) comply with some or any technical or legal requirements that are applicable to finished products, including, without limitation, directives regarding electromagnetic compatibility, recycling (WEEE), FCC, CE, or UL (except as may be otherwise noted on the board/kit). MattairTech LLC supplied this board/kit AS IS, without any warranties, with all faults, at the buyer's and further users' sole risk. The user assumes all responsibility and liability for proper and safe handling of the goods. Further, the user indemnifies Atmel from all claims arising from the handling or use of the goods. Due to the open construction of the product, it is the user's responsibility to take any and all appropriate precautions with regard to electrostatic discharge and any other technical or legal concerns.

The authors disclaim all warranties with regard to this software, including all implied warranties of merchantability and fitness. In no event shall any author be liable for any special, indirect or consequential damages or any damages whatsoever resulting from loss of use, data or profits, whether in an action of contract, negligence or other tortious action, arising out of or in connection with the use or performance of this software.

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