ATSHA204A ATSHA204A Microchip CryptoAuthentication Data Sheet Features • Crypto Element with Protected Hardware-Based Key Storage • Secure Symmetric Authentication Device 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.
5 kb EEPROM for Keys and Data • 512 bit OTP (One Time Programmable) Bits for Fixed Information • Multiple I/O Options – UART-compatible High-Speed, Single-Wire Interface – 1 MHz I2C Interface • 2.
0V to 5.
5V S...

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