Microcontroller Module with ATmegaX256A3, USB, RS485, Micro SD-Card.

CrumbX256A3 V1.2 is a versatile, very small (just 40x30mm footprint!) microcontroller module with the ATxmega256A3 microcontroller, CP2102 USB UART converter, RS485 transceiver, voltage regulator and micro sd-card slot. All ATxmega256A3 signals are available on pads. A selectable XTAL crystal or watch crystal is included.

The CrumbX256A3 is being shipped without preassembled pinheaders, since everybody has different preferences here. A suitable Connector Kit with pin headers and receptacles can be ordered optionally.

Further information can be found in the infosheet.

Technical Data

• ATxmega256A3 (256k+8k Flash, 8k SRAM, 2k EEPROM)
• ISP interface with 6-pin standard pinout
• CP2102 USB UART converter at USART0/PORTF
• 75ALS176 RS485 transceiver at USART0/PORTE
• XTAL crystal frequency selectable or watch crystal
• connections: 2x 32-pin with all processor signals, USB and RS485 signals, 1x 6-pin ISP, mini USB B connector (5-pin), micro sd-card
• 2.54mm (1/10inch) modular grid
• dimensions: 40.64mm x 30.48mm

Product Documentation

• CrumbX256A3 V1.2 Infosheet
  
• CrumbX256A3 V1.2 Schematics
  

Datasheets and Drivers

Atmel

• Atmel AVR ATxmega256A3 microcontroller
• AVR XMEGA A Manual

Silicon Laboratories

• CP2102 USB UART Bridge Datasheet
• CP2102 Homepage
• Virtual COM Port Drivers for Windows 2000/XP/Server 2003/Vista, Macintosh OS9/OSX, Linux 2.4/2.6