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To the shop Table of Contents Features Programming of the microcontrollers, Firmware Development Kit and Examples Functional description     External power: CON1     AVR PDI header     EEPROM address: JP2     USB power: JP1     I/O Connector Images Additional resources Schematics (PDF) Eagle Library of the I/O connector Cypress CY7C68013A/14A datasheet from the Cypress homepage EZ-USB FX2 Technical Reference Manual from the Cypress homepage AVR XMEGA A Manual ATxmega64A1/128A1/192A1/256A1/384A1 datasheet

Features

• USB 2.0 Interface via Mini-USB connector (B-type)
• Cypress EZ-USB FX2 microcontroller CY7C68013A/14A for USB connectivity
• AVR ATXmega128A1 microcontroller for analog functions:
  • 2 eight-channel, 12 Bit, 2 Msps Analog to Digital Converter (ADC), software selectable gain of up to 64
  • 2 two-channel, 12 Bit, 1 Msps Digital to Analog Converter (DAC)
  • 4 Analog Comparators (AC) with Window-Function and input form DAC
  • DMA controller for data transfers without CPU intervention
  • Firmware programming and NVM access via USB using the EZ-USB FX2 SDK (no programming cables required)
  • 128 KByte Flash + 2 KByte EEPROM
  • USART's, IrDA modulation/demodulation
  • Eight channel event system
  • Two-wire interfaces (I²C and SMBus) and SPI interfaces
  • AES and DES crypto engine
• 66 General Purpose I/O's (GPIO):
  • 16 GPIO's from EZ-USB FX2 (12 if microSD card is used)
  • 50 GPIO's from XMEGA
• 14 special I/O's (SIO) from EZ-USB FX2:
  • 2 serial ports (4 pins)
  • I²C interface (2 pins)
  • 1 interrupts
  • 3 timers
  • 1 clock output
  • 1 Wakeup pin
  • 1 Breakpoint pin
  • 1 reset pin
• MicroSD socket for standard and high capacity (SDHC) microSD cards (the cards must support the SPI mode)
• 128 Kbit EEPROM memory
• On-board high-efficiency 3.3 V / 700 mA (1.3 A peak) switching regulator
  • Supports bus powered operation via USB
  • Supports external powered 4.6 to 20 V operation
  • Both supply inputs are protected by diodes and thus can be driven safely at the same time

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Programming of the microcontrollers, Firmware Development Kit and Examples

The SDK supports programming of the EZ-USB FX2 and the ATxmega microcontrollers and access to their non volatile memories. No additional programming cables are required.

The SDK package contains a lot of examples which can be used as starting point for own applications.

More Information are available in the EZ-USB FX2 SDK section.

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Functional description

The following drawing shows the measurements and the location of the of the described elements.

Click on the image for a larger version or download the PDF version.

External power: CON1

It is also possible to supply the external voltage via the I/O connector described below.

AVR PDI header

EEPROM address: JP2

The EZ-USB FX2 Microcontroller searches for the firmware at the address 0xA2 which is the default address (jumper open).

The main purpose of this jumper is to disable the EEPROM boot-load. If, for example, the EEPROM was programmed with a corrupt firmware the Microcontroller can be booted with the internal default firmware by short cutting the two pads of jumper JP2 during powering-on the USB-XMEGA Board.

USB Power: JP1

If this jumper is closed the bus powered supply via USB is enabled. By default this jumper is closed by a small wire. (The wire may be covered by the solder mask.) If bus powered operation is not desired this wire can be cut. (After that JP1 can by closed by solder bridge.)

Usually there is no need to open JP1 since both, the bus powered supply and the external supply are protected by diodes, see the schematics. Only if the required current is large (more than the USB port can deliver) and if the external voltage is less than 5.5 V Jumper JP1 should be opened.

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I/O Connector

Two 2x26 pin connectors deliver the I/O signals and are used for the power supply. The drawing shows the position of the connectors.

There is a polarization key in form of a small hole close to the B1 pin as shown on the drawing. In order to prevent damage equal orientation of the polarization key (hole) of all stacked boards must be ensured.

The following Pinlist and the List of Connections Can be downloaded Gnumeric or Excel format. The Pinlist reads as:

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Images

Click on the images for larger versions.

Top side of the USB-XMEGA Board.

The USB-XMEGA Module perfectly fits on a triple-pad Prototyping board. The depicted set consists in: 1 × USB-XMEGA Module 1 × Prototyping board 2 × 2x26 pin female pin header 2 × 2x26 pin male pin header