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Introduction

The following sections introduce the features and functions of the Atmel? ATSHA204 authentication device.

Features

● Secure authentication and validation device

● Integrated capability for both Host and Client operations

● Superior SHA-256 Hash algorithm with Message Authentication Code (MAC) and

Hash-Based Message Authentication Code (HMAC) options

● Best-in-class, 256-bit key length; storage for up to 16 keys

● Guaranteed unique 72-bit serial number

● Internal, high-quality Random Number Generator (RNG)

● 4.5Kb EEPROM for keys and data

● 512 OTP (One Time Programmable) bits for fixed information

● Multiple I/O options

● High-Speed, Single-Wire Interface

● 1MHz I2C interface

● 2.0V to 5.5V supply voltage range

● 1.8V to 5.5V communications

● <150nA sleep current

● Extended, multi-level hardware security

● 8-lead SOIC, 8-lead TSSOP, 3-lead SOT23, 8-pad UDFN, and 3-lead Contact

packages

Applications

● Anti-clone protection for accessories, daughter cards, and consumables

● Secure boot validation, software anti-piracy

● Network and computer access control

● Key exchange for encrypted downloads

● Authenticated/encrypted communications for control networks