The ATSHA204A-SSHDA-T from Microchip is a SHA-256 cryptographic authentication IC with 4.5Kb EEPROM, 16 key slots, unique 72-bit serial number, and I2C\/Single-Wire interface in SOIC-8 for secure authentication and anti-counterfeiting.<\/p>\n
| \u0627\u0644\u062d\u0632\u0645\u0629<\/td>\n | SOIC-8 (3.9×4.9mm)<\/td>\n<\/tr>\n<\/table>\n\u0627\u0644\u0645\u064a\u0632\u0627\u062a<\/h2>\n\u0627\u0644\u062a\u0637\u0628\u064a\u0642\u0627\u062a<\/h2>\nProduct Overview The ATSHA204A-SSHDA-T from Microchip is a SHA-256 cryptographic authentication IC with 4.5Kb EEPROM, 16 key slots, unique 72-bit serial number, and I2C\/Single-Wire interface in SOIC-8 for secure authentication and anti-counterfeiting. Key Specifications Package SOIC-8 (3.9×4.9mm) Features See datasheet for complete specifications Industry-standard package Applications Industrial control Consumer electronics Communication equipment Power management<\/p>","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[13,20],"tags":[],"chip_brand":[134],"class_list":["post-5641","post","type-post","status-publish","format-standard","hentry","category-integrated-circuits-ics","category-interface-ics","chip_brand-microchip"],"acf":{"brief_explanation":"SHA-256 crypto authentication IC, I2C\/SWI, SOIC-8","date_code":"","package_case":"SOIC-8 (3.9x4.9mm)","in_stock":5772,"datasheet":"https:\/\/www.microchip.com\/en-us\/product\/ATSHA204A","price":"$0.65 @ 1ku","product_introduction":"The ATSHA204A-SSHDA-T from Microchip is a SHA-256 cryptographic authentication IC with 4.5Kb EEPROM, 16 key slots, unique 72-bit serial number, and I2C\/Single-Wire interface in SOIC-8 for secure authentication and anti-counterfeiting.","working_principle":"The ATSHA204A-SSHDA-T is a cryptographic authentication IC from Microchip in SOIC-8, implementing SHA-256 hash-based challenge-response authentication. The device contains a 4.5Kbit EEPROM organized into 16 slots (32 bytes each) for storing keys, certificates, and data. The key security feature is that slot 0-3 can be configured as read-only or never-read (secret keys), ensuring private keys never leave the device. Authentication works as follows: (1) The host MCU sends a random challenge (32 bytes) to the ATSHA204A; (2) The ATSHA204A concatenates the challenge with the internal secret key and other data; (3) It computes SHA-256 of the concatenated message; (4) It returns the 32-byte digest to the host; (5) The host independently computes the expected digest using the known key and compares. If they match, the peripheral is authenticated. The device also supports HMAC (Hash-based Message Authentication Code) for bidirectional authentication. The single-wire interface uses a standard I2C-style open-drain bus: the host pulls SDA LOW to start a wake-up pulse (60us minimum), then the device responds after 1.3ms wake-up time. Commands and data are exchanged using a custom bit-serial protocol with specific timing requirements. The device includes a hardware random number generator (RNG) for generating challenges and nonces. The 100k write cycle endurance per slot supports key rotation. The -SSHDA-T suffix specifies SOIC-8 with 1.8V-5.5V supply, industrial temperature (-40C to +85C), tape-and-reel.","pin_description":"
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