Microcontroller Module with ATmega644P, Ethernet, RJ45, Dataflash, USB.

Crumb644-NET V2.1 is a highly integrated embedded ethernet module with the Atmel AVR ATmega644P microcontroller, CP2201 ethernet controller, transformer, RJ45 modular jack and USB interface.

Ethernet Interface

The Crumb644-Net ethernet interface is based on Silcon Labs' CP2201 10Mbit ethernet controller with integrated phy. Additionally the ethernet transformer is already integrated on Crumb644-Net, hence no high-cost RJ45 jack with integrated transformer is required! A simple RJ45 header is suitable for connecting the Crumb644-Net to the network.

USB Interface

In addition to the ethernet interface a USB UART converter is integrated on the board, which is a comfortable way for ethernet configuration or to show debug output during development.

Embedded TCP/IP Stack and Webserver

uIP is an implementation of the TCP/IP protocol stack, optimized for small 8 bit microcontrollers. uIP provides all necessary protocols for internet connectivity, with a very small code footprint and RAM requirements. uIP is open source software, developed in C and may be freely used in both non-commercial as well as commercial projects. uIP is covered by the BSD-Style License. Further information in uIP is available on the uIP homepage of Adam Dunkels'.

A port of the uIP Embedded TCP/IP Stack and webserver for the Crumb644-Net can be downloaded on the download page.

With V1.3 of our port a demo webpage is included, which demonstrates measurement and control applications. The onboard LED of the modules can be switched by clicking on a webpage of the webserver and the adc inputs of the module are visualized.

Crumb IO Firmware

An alternative port of the uIP stack was done by Stefan Frings and was extended by addition protocols, like SMTP for sending an email on an external event. See Stefan Frings homepage for details. The homepage is currently available only in english, but the source code is documented in english. The Crumb IO firmware is also available in the download section.

Scope of Delivery

Crumb644-NET is shipped without pin headers, since everybody likes different types (up, down, male, female, etc.). A Connector Kit with high quality pins and receptacles, link LED, RJ45 connector and mini USB connector can be ordered as an option.

Further Informations

 ...can be found in the Infosheet.

Technical Data

• the ATmega644P microcontroller
• 10Mbit ethernet interface with CP2201 ethernet controller
• ethernet transformer!
• 3.3V voltage regulator (for ethernet controller)
• CP2102 USB UART converter at USART0
• 4Mbit serial data flash
• standard 6-pin AVR ISP connector
• 20MHz clock crystal
• status LEDs (1x ethernet link/activity, 2x free programmable)
• pin headers with unused ATmega644 signals, ADC inputs and ethernet signals
• footprint for RJ45 jack and footprint for mini USB connector
• size:40.64 x 30.48mm

Product Documentation

• Crumb644-NET V2.1 Infosheet
• Crumb644-NET V2.1 Schematics

Datasheets and Drivers

Atmel

• Atmel AVR ATmega644P Microcontroller

Silicon Laboratories

• CP2201 Ethernet Controller by Silicon Laboratories

TCP/IP Stack and Webserver

A port of the uIP TCPIP stack and webserver by Adam Dunkels is available for download.

• uIP_Crumb644-Net_V1.3.zip New version with better handling of the embedded html pages (windows tool for html to hex conversion) and demo page with onboard LED switching and visualization of adc inputs!
• uIP_Crumb644-Net_V1.2.zip Fixes the "strchr_P" error...
• uIP_Crumb644-Net_V1.1.zip

• Converter.xls WebPage Converter.xls Excel VBA tool for generating c code from html files for embedding into code! Thanks to Peter Sager for contributing this useful freeware tool!

Universal Firmware for Crumb Modules

• Crumb I/O firmware by Stefan Frings

Eagle Library

• Schematic symbols and layout footprints as Eagle library