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
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