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MT-DB-X4 Atmel AVR XMEGA 44-pin AU/A/C/D USB development board (ie: ATxmega128a4u)

Availability: In stock

  • Buy 5 for $17.99 each and save 11%
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Quick Overview

New! Now available with: ATxmega32a4u, ATxmega128a4u, ATxmega32d4, ATxmega128d4, ATxmega16c4, and ATxmega32c4.

No USB support for the D variant.
Shipping for all variants is now available worldwide.

MT-DB-X4 Manual

Please read below the options for configuration information.

   This item ships VAT free to most EU countries   
   if total is less than about $24.00 (€22.00).   


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  • MT-DB-X4
  • MT-DB-X4 Schematic

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The MT-DB-X4 is a development board for the 44-pin Atmel AVR XMEGA AU, C, and D microcontrollers. The AU (ie: ATxmega128a4u) and C variants support USB device mode. All variants can be powered from USB or from the Vin pin. Two schottky diodes facilitate simple switching (and reverse-polarity protection) between the two power sources. This voltage is regulated to 3.3V by the onboard 500mA, low quiescent current LDO regulator that supports up to 6V DC input voltage. Overcurrent protection is provided by a 500mA PTC resettable fuse. Also mounted is a mini USB connector, green LED, 16MHz crystal, 32.768KHz RTC crystal, reset button, and a boot jumper. The board has 40 main dual inline header pins with 100 mil pin spacing and 700 mil row spacing which allows for mounting on a breadboard or perfboard. The PDI/SPI header can be used with an external programmer, or be reconfigured to be used as a SPI master or slave. A DFU bootloader comes preinstalled (except A or D variants) which allows programming of the chip over USB without an external programmer. The PCB measures approximately 2.1” x 0.9” x 0.062” (52mm x 33mm x 1.6mm).


*    Atmel AVR XMEGA AU, C, or D 44-pin microcontroller
            ATxmega32a4u, ATxmega128a4u, ATxmega16C4, ATxmega32D4, ATxmega128D4
            AU (A4U) and C variants support USB device mode
*   Onboard 3.3V, 500mA LDO regulator
           up to 6V DC input
           low quiescent current (120uA typical, 220uA max.)
           low dropout (210mV typical, 350mV max. @ 500mA)
           0.5% output tolerance typical
           Over-current and over-temperature protection
*   Simple power source switching
           2 schottky diodes (Vbus and Vin)
           Reverse-polarity protection
           Vbus can be disconnected (solder jumper)
           Vin schottky can be shorted (solder jumper) to eliminate voltage drop (battery use)
           Either Vin or Vbus can be routed through a resistor divider (/2) to pin B3 (ADC)
*   PTC resettable fuse (500mA)
*   DFU bootloader preinstalled (FLIP for Windows or dfu-programmer for Linux)(NOT on D variant)
*   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
*   32.768KHz crystal for real-time counter
*   Green Status LED (can be disconnected)
*   Reset button
*   Bootloader activation jumper
*   Mini USB connector
*   USB pins routed to header pins (for panel-mount USB connector)
*   Powered by USB or external power source (up to 6V) on Vin
*   Ferrite bead on analog supply
*   19 solder jumpers for configuration flexibility
*   All PORT pins routed to headers (except R0)
*   2 main headers are on 0.1” spacing (breadboard/perfboard mounting)
*   Two 3mm mounting holes (~5mm pad)
*   High-quality PCB with gold-plated finish
*   Measures approx. 2.1” x 0.9” (52mm x 33mm) and 0.062” (1.6mm) thick.


USB DFU Bootloader

  MT-DB-X4_DFU_Bootloaders_104.zip  Revision 104

MT-DB-X4_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 https://www.mouser.com/ds/2/268/doc8429-1066104.pdf and the User Guide

Blink Demo


MT-DB-X4_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.microchip.com/developmenttools/ProductDetails.aspx?PartNO=FLIP and install. Older versions may not support the latest XMEGA variants (AU or C). 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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