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Atmel AT91 (ARM) 100Mbps Ethernet & Web Server Board US$205.00

EthernutBRD-V3.1
Atmel AT91 (ARM) 100Mbps Ethernet & Web Server Board


The Ethernut V3.1 is a webserver board with an ARM7 CPU, which offers at least 10 times the performance of its predecessors. The on-board memory of 256 kByte RAM, 4 MByte NOR FLASH and 4MBytes serial dataFlash are expandable via the MMC socket. Additional features are 100 MBit Ethernet, RS232 with full modem handshake, realtime clock with capacitor backup and a flexible power supply with two switching regulators.

The hardware and the preloaded OS and TCP/IP stack are open source and may be used within non-commercial and commercial, open- and closed-source projects without fee or royalties.

ARM7 Ethernet & Web Server Board Features

  • AT91R40008 ARM7TDMI CPU running at 73.728 MHz
  • 256 kByte RAM with 32-bit Data Path
  • 4 MByte NOR Flash Memory with four Boot Options
  • 4 MByte Serial Data Flash
  • Solder pads for Configuration EEPROM
  • CPLD with 144 Macrocells
  • Programmable Clock Generator
  • Real-Time Clock with SuperCap Backup
  • 10/100 MBit Ethernet Interface
  • Unique MAC address
  • RS232 Interface with Full Modem Handshake
  • Multimedia/SD Card Socket
  • FFC Connector for optional LCD/Keyboard Panel
  • Ethernut 1/2 compatible Expansion Port (3.3V only)
  • Switching Voltage Regulator for 9-25V Input
Note: The Ethernut 3.1 board has a unique 10-pin JTAG interface, whereas most ARM JTAG Debuggers have a 20-pin connection. You will need to build your own cable if you want to debug using JTAG, or purchase the Starter Kit which includes a compatible debugger.

Ethernut Software

The well documented software is an Open-Source implementation of a Real Time Operating System called Nut/OS, and a TCP/IP protocol suite named Nut/Net.

Several application examples are provided, including an embedded Webserver, a simple RS232-to-TCP/IP gateway, and an Internet Radio playing MP3 streams.

Ethernut Application Development

A well documented API and plenty of free program space and free data memory are available to implement custom applications easily. The source code is written almost entirely in C and included on CD-ROM. The software license allows its royalty-free use in Open- and Closed-Source Projects.

In addition you will need (not included):

  • Power Supply: 5-24V DC, 300mA
  • RJ45 twisted pair Ethernet cable to connect the Ethernut board to your network
  • Pentium class PC running Windows or Linux O/S

Ethernut 3.1 Resources


Optional Recommended Products for this Item
Power Supply 3-12V DC, U.S. plug, 6 connection tips+ US$11.00
Power Supply 3-12V DC, US/UK/Euro/AU Plugs, 100-240VAC+ US$13.00
Ethernet Cable, CAT5E 350MHz Unshielded, 7ft.+ US$3.60
Ethernet Crossover Cable, CAT5E 350MHz Unshielded, 5ft.+ US$7.00
Serial Cable, 6ft., DB9 M/F+ US$6.00
Ethernut I/O Expansion Board: 8 Isolated I/O, Solid-State Relays+ US$102.00

This product was added to our catalog on Wednesday 23 February, 2011.

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