ATSHA204A Atmel CryptoAuthentication DATASHEET Features Crypto Element with Protected Hardware-based Key Storage CryptoAuthentication Ensures Things and Code Secure Symmetric Authentication Device Host and Client Operations are Real, Untampered, and Superior SHA-256 Hash Algorithm with Message Authentication Code (MAC) Confidential 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 bit OTP (One Time Programmable) Bits for Fixed Information Multiple I/O Options UART-compatible High-Speed, Single-Wire Interface 2 1MHz I C Interface 2.0V to 5.5V Supply Voltage Range 1.8V to 5.5V Communications Voltage Range <150nA Sleep Current Secure Download and Boot Secure Download and Boot Ecosystem Control Authentication and Protect Code In-transit Message Security Ecosystem Control Anti-Cloning Ensure Only OEM/Licensed (2) 8-lead SOIC, 8-lead TSSOP , 3-lead SOT23, 8-pad UDFN, 8-pad XDFN, and Nodes and Accessories Work 3-lead CONTACT Packages Anti-cloning Prevent Building with Identical BOM or Stolen Code Applications Message Security Authentication, Message Integrity, Secure Download and Boot and Confidentiality of Network Ecosystem Control Nodes (IoT) Anti-cloning Message Security Atmel-8885H-CryptoAuth-ATSHA204A-Datasheet 112015Table 1. Pin Configurations Pin Name Function NC No Connect GND Ground SDA Serial Data SCL Serial Clock Input V Power Supply CC (1) Figure 1. Pinouts (2) 8-lead SOIC 8-lead TSSOP (Top View) (Top View) NC 1 8 V NC V CC 1 8 CC NC 2 7 NC NC 2 7 NC NC 3 6 SCL 3 6 NC SCL 4 5 GND SDA 4 5 GND SDA 8-pad UDFN/XDFN 3-lead SOT (Top View) (Top View) NC V 1 8 CC 2 V CC NC NC 2 7 3 NC SCL GND 3 6 GND SDA 4 5 1 SDA 3-lead Contact (Top View) 1 SDA 2 GND 3 V CC Notes: 1. Drawings are not to scale. 2. Not recommended for new design. 2 ATSHA204A DATASHEET Atmel-8885H-CryptoAuth-ATSHA204A-Datasheet 112015