DS2432

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


Please check latest availability status for a specific part variant.

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.

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

Technical Documents

App Note 5507 Understanding the DS1WM Synthesizable 1-Wire Bus Master
App Note 5485 Understanding the DSSHA1 Synthesizable SHA-1 Coprocessor
Tutorial 5403 How to Build a 1-Wire® Evaluation Kit
App Note 4717 Injection Molding an IC into a Connector or Consumable Item
Reference Schematic 4477 Reference Design of a 1-Wire® Bidirectional Voltage-Level Translator for 1.8V to 5V
App Note 4427 Demonstrating Green Technology with Apples, Oranges, Lemons, and Limes
Tutorial 4255 How to Power the Extended Features of 1-Wire® Devices
App Note 4132 Attachment Methods for the Electro-Mechanical 1-Wire Contact Package
App Note 4002 Understanding Flip-Chip and Chip-Scale Package Technologies and Their Applications
App Note 3826 Xilinx® FPGA IFF Copy Protection with 1-Wire® SHA-1 Secure Memories
App Note 3522 White Paper 9: Are SHA-1 Devices Still Secure Enough?
Tutorial 3438 Serial Digital Data Networks
App Note 3377 Maxim Wafer-Level Package Assembly Guide
App Note 1820 White Paper 1: SHA Devices Used in Small Cash Systems
Tutorial 1201 White Paper 8: 1-Wire® SHA-1 Overview
App Note 1100 White Paper 5: Using 1-Wire APIs for Data Sheet Commands
App Note 1099 White Paper 4: Glossary of 1-Wire SHA-1 Terms
App Note 1098 White Paper 3: Why are 1-Wire SHA-1 Devices Secure?
App Note 1097 White Paper 2: Using the 1-Wire® Public Domain Kit
Reference Schematic 244 Advanced 1-Wire Network Driver
App Note 192 Using the DS2480B Serial 1-Wire® Line Driver
App Note 190 Challenge and Response with 1-Wire® SHA Devices
App Note 187 1-Wire Search Algorithm
App Note 178 Printed Circuit Board Identification Using 1-Wire® Products
App Note 155 1-Wire Software Resource Guide Device Description
App Note 154 Passwords in SHA Authentication
App Note 151 Maxim Digital Monetary Certificates
App Note 126 1-Wire Communication Through Software
App Note 74 Reading and Writing 1-Wire® Devices Through Serial Interfaces
App Note 27 Understanding and Using Cyclic Redundancy Checks with Maxim 1-Wire and iButton Products

Quality and Environmental Data

Product Reliability Reports: DS2432.pdf 
Lead-Free Package Tin (Sn) Whisker Reports

Additional Resources

Sensor Calibration

CAD Symbols and Footprints

  • DS2432P+
  • DS2432P+T&R
  • DS2432P-W10+1
  • DS2432P-W10+1T
  • DS2432P-W10+2
  • DS2432P-W10+2T
  • DS2432P-W10+3
  • DS2432P-W10+3T
  • DS2432X-S+
  • Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C  

    Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

    Quality Management System >
    Environmental Management System >

     
    Status:
    Package:
    Temperature:

    Related Resources

    Type ID PDF Title
    App Note 5507 Understanding the DS1WM Synthesizable 1-Wire Bus Master
    App Note 5485 Understanding the DSSHA1 Synthesizable SHA-1 Coprocessor
    Tutorial 5403 How to Build a 1-Wire® Evaluation Kit
    App Note 4717 Injection Molding an IC into a Connector or Consumable Item
    Reference Schematic 4477 Reference Design of a 1-Wire® Bidirectional Voltage-Level Translator for 1.8V to 5V
    App Note 4427 Demonstrating Green Technology with Apples, Oranges, Lemons, and Limes
    Tutorial 4255 How to Power the Extended Features of 1-Wire® Devices
    App Note 4132 Attachment Methods for the Electro-Mechanical 1-Wire Contact Package
    App Note 4002 Understanding Flip-Chip and Chip-Scale Package Technologies and Their Applications
    App Note 3826 Xilinx® FPGA IFF Copy Protection with 1-Wire® SHA-1 Secure Memories
    App Note 3522 White Paper 9: Are SHA-1 Devices Still Secure Enough?
    Tutorial 3438 Serial Digital Data Networks
    App Note 3377 Maxim Wafer-Level Package Assembly Guide
    App Note 1820 White Paper 1: SHA Devices Used in Small Cash Systems
    Tutorial 1201 White Paper 8: 1-Wire® SHA-1 Overview
    App Note 1100 White Paper 5: Using 1-Wire APIs for Data Sheet Commands
    App Note 1099 White Paper 4: Glossary of 1-Wire SHA-1 Terms
    App Note 1098 White Paper 3: Why are 1-Wire SHA-1 Devices Secure?
    App Note 1097 White Paper 2: Using the 1-Wire® Public Domain Kit
    Reference Schematic 244 Advanced 1-Wire Network Driver
    App Note 192 Using the DS2480B Serial 1-Wire® Line Driver
    App Note 190 Challenge and Response with 1-Wire® SHA Devices
    App Note 187 1-Wire Search Algorithm
    App Note 178 Printed Circuit Board Identification Using 1-Wire® Products
    App Note 155 1-Wire Software Resource Guide Device Description
    App Note 154 Passwords in SHA Authentication
    App Note 151 Maxim Digital Monetary Certificates
    App Note 126 1-Wire Communication Through Software
    App Note 74 Reading and Writing 1-Wire® Devices Through Serial Interfaces
    App Note 27 Understanding and Using Cyclic Redundancy Checks with Maxim 1-Wire and iButton Products

    Electronics in Vehicles (ELIV) 2019
    10/16/2019 - 10/17/2019, Bonn, Germany
    The international VDI Congress ELIV (Electronics In Vehicles) is THE event for all experts in the field of electrical and electronical car engineering and integration of mechanical and electronical systems.

    RSVP