ATSHA204 Breakout Repository
Here you'll find the hardware design files for the SparkFun ATSHA204 Breakout. You'll also find example Arduino code, including a library for this powerful little chip.
In the hardware directory, you'll find the Eagle design files - board and schematic - as well as a pdf version of the schematic.
In the sha204_library directory, you'll find the ATSHA204 Arduino Library as well as example code to demo what it can do.
What is the Atmel ATSHA204?
The Atmel ATSHA204 is an optimized authentication chip that includes a 4.5Kb EEPROM. This array can be used for storage of keys, miscellaneous read/write, read-only, password or secret data, and consumption tracking. Access to the various sections of memory can be restricted in a variety of ways and then the configuration locked to prevent changes.
Each ATSHA204 ships with a guaranteed unique 72-bit serial number. Using the cryptographic protocols supported by the chip, a host system or remote server can prove that the serial number is both authentic and not a copy. The ATSHA204 can generate high-quality random numbers and employ them for any purpose, including usage as part of the crypto protocols of this chip.
Here's a link to the datasheet.
- Jim Lindblom @ SparkFun Electronics