CrumbX128A1 V1.0 is a versatile, very small (just 60x30mm footprint!) microcontroller module with the ATxmega128A1 microcontroller, CP2102 USB UART converter, RS485 transceiver, sd-card slot, voltage regulator. All ATxmega128A1 signals are available on pads. A selectable XTAL crystal or watch crystal is included.
The CrumbX128A1 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.
Atmel
Silicon Laboratories
Tiny USB 2.0 to UART Interface Module (DIL16 sized, CP2102, miniUSB-B Connector.