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1Kb Protected 1-Wire EEPROM with SHA-1 Engine

Product Details

Key Features

Applications/Uses

Technical Docs

Data Sheet 1Kb Protected 1-Wire EEPROM with SHA-1 Engine Sep 25, 2012
App Note Understanding and Using Cyclic Redundancy Checks with Maxim 1-Wire and iButton Products
App Note Reading and Writing 1-Wire® Devices Through Serial Interfaces
App Note 1-Wire Communication Through Software
App Note Maxim Digital Monetary Certificates
App Note Passwords in SHA Authentication
App Note 1-Wire Software Resource Guide Device Description
App Note Printed Circuit Board Identification Using 1-Wire® Products
App Note 1-Wire Search Algorithm
App Note Challenge and Response with 1-Wire® SHA Devices
App Note Using the DS2480B Serial 1-Wire® Line Driver
Reference Schematic Advanced 1-Wire Network Driver
App Note White Paper 2: Using the 1-Wire® Public Domain Kit
App Note White Paper 3: Why are 1-Wire SHA-1 Devices Secure?
App Note White Paper 4: Glossary of 1-Wire SHA-1 Terms
App Note White Paper 5: Using 1-Wire APIs for Data Sheet Commands
Tutorial White Paper 8: 1-Wire® SHA-1 Overview
App Note White Paper 1: SHA Devices Used in Small Cash Systems
App Note Maxim Wafer-Level Package Assembly Guide
Tutorial Serial Digital Data Networks
App Note White Paper 9: Are SHA-1 Devices Still Secure Enough?
App Note Xilinx® FPGA IFF Copy Protection with 1-Wire® SHA-1 Secure Memories
App Note Understanding Flip-Chip and Chip-Scale Package Technologies and Their Applications
App Note Attachment Methods for the Electro-Mechanical 1-Wire Contact Package
App Note Demonstrating Green Technology with Apples, Oranges, Lemons, and Limes
Reference Schematic Reference Design of a 1-Wire® Bidirectional Voltage-Level Translator for 1.8V to 5V
App Note Injection Molding an IC into a Connector or Consumable Item
Tutorial How to Build a 1-Wire® Evaluation Kit
App Note Understanding the DSSHA1 Synthesizable SHA-1 Coprocessor
App Note Understanding the DS1WM Synthesizable 1-Wire Bus Master

Support & Training

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Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .

Key Features

  • 1128 Bits of 5V EEPROM Memory Partitioned Into Four Pages of 256 Bits, a 64-Bit Write-Only Secret, and Up to Five General-Purpose Read/Write Registers
  • On-Chip 512-Bit ISO/IEC 10118-3 SHA-1 Engine to Compute 160-Bit Message Authentication Codes (MACs) and to Generate Secrets
  • Write Access Requires Knowledge of the Secret and the Capability of Computing and Transmitting a 160-Bit MAC as Authorization
  • Secret and Data Memory Can Be Write Protected (All or Page 0 Only) or Put in EPROM-Emulation Mode ("Write to 0", Page 1)
  • Unique, Factory-Lasered and Tested 64-Bit Registration Number Assures Absolute Traceability Because No Two Parts Are Alike
  • Built-In Multidrop Controller Ensures Compatibility with Other 1-Wire® Net Products
  • Reduces Control, Address, Data, and Power to a Single Data Pin
  • Directly Connects to a Single Port Pin of a Microprocessor and Communicates at Up to 15.3kbps
  • Overdrive Mode Boosts Communication Speed to 90.9kbps
  • Low-Cost 6-Lead TSOC Surface-Mount Package or Solder-Bumped UCSP™ Package
  • Reads and Writes Over a Wide Voltage Range of 2.8V to 5.25V from -40°C to +85°C

Applications/Uses

  • Device Authentication
  • IEEE 1451.4 Sensor TEDS
  • Ink/Toner Cartridges
  • Medical Sensors
  • PCB Identification
  • Self-Configuration of Central Office Switches, Wireless Base Stations, PBXs, or other Modular-Based Rack Systems

Description

The DS2432 combines 1024 bits of EEPROM, a 64-bit secret, an 8-byte register/control page with up to five user read/write bytes, a 512-bit SHA-1 engine, and a fully-featured 1-Wire interface in a single chip. Each DS2432 has its own 64-bit ROM registration number that is factory lasered into the chip to provide a guaranteed unique identity for absolute traceability. Data is transferred serially via the 1-Wire protocol, which requires only a single data lead and a ground return. The DS2432 has an additional memory area called the scratchpad that acts as a buffer when writing to the main memory, the register page or when installing a new secret. Data is first written to the scratchpad from where it can be read back. After the data has been verified, a copy scratchpad command will transfer the data to its final memory location, provided that the DS2432 receives a matching 160-Bit MAC. The computation of the MAC involves the secret and additional data stored in the DS2432 including the device's registration number. Only a new secret can be loaded without providing a MAC. The SHA-1 engine can also be activated to compute 160-bit message authentication codes (MAC) when reading a memory page or to compute a new secret, instead of loading it. Applications of the DS2432 include intellectual property security, after-market management of consumables, and tamper-proof data carriers.

Technical Docs

Data Sheet 1Kb Protected 1-Wire EEPROM with SHA-1 Engine Sep 25, 2012
App Note Understanding and Using Cyclic Redundancy Checks with Maxim 1-Wire and iButton Products
App Note Reading and Writing 1-Wire® Devices Through Serial Interfaces
App Note 1-Wire Communication Through Software
App Note Maxim Digital Monetary Certificates
App Note Passwords in SHA Authentication
App Note 1-Wire Software Resource Guide Device Description
App Note Printed Circuit Board Identification Using 1-Wire® Products
App Note 1-Wire Search Algorithm
App Note Challenge and Response with 1-Wire® SHA Devices
App Note Using the DS2480B Serial 1-Wire® Line Driver
Reference Schematic Advanced 1-Wire Network Driver
App Note White Paper 2: Using the 1-Wire® Public Domain Kit
App Note White Paper 3: Why are 1-Wire SHA-1 Devices Secure?
App Note White Paper 4: Glossary of 1-Wire SHA-1 Terms
App Note White Paper 5: Using 1-Wire APIs for Data Sheet Commands
Tutorial White Paper 8: 1-Wire® SHA-1 Overview
App Note White Paper 1: SHA Devices Used in Small Cash Systems
App Note Maxim Wafer-Level Package Assembly Guide
Tutorial Serial Digital Data Networks
App Note White Paper 9: Are SHA-1 Devices Still Secure Enough?
App Note Xilinx® FPGA IFF Copy Protection with 1-Wire® SHA-1 Secure Memories
App Note Understanding Flip-Chip and Chip-Scale Package Technologies and Their Applications
App Note Attachment Methods for the Electro-Mechanical 1-Wire Contact Package
App Note Demonstrating Green Technology with Apples, Oranges, Lemons, and Limes
Reference Schematic Reference Design of a 1-Wire® Bidirectional Voltage-Level Translator for 1.8V to 5V
App Note Injection Molding an IC into a Connector or Consumable Item
Tutorial How to Build a 1-Wire® Evaluation Kit
App Note Understanding the DSSHA1 Synthesizable SHA-1 Coprocessor
App Note Understanding the DS1WM Synthesizable 1-Wire Bus Master

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .