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DS2432: 1Kb Protected 1-Wire EEPROM with SHA-1 Engine Data Sheet (Rev. 7)9/25/2012PDF373K
Overview
Features and Benefits
- 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
Product Details
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.
Applications
- 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
Product Categories
Product Lifecycle
Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Evaluation Kits (2)
Documentation & Resources
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DS2432 Reliability Data1/12/2023PDF28K
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How to Build a 1-Wire® Evaluation Kit5/14/2012
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Injection Molding an IC into a Connector or Consumable Item8/3/2010
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White Paper 2: Using the 1-Wire® Public Domain Kit7/16/2008
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1-Wire Software Resource Guide Device Description7/8/2008
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How to Power the Extended Features of 1-Wire® Devices6/17/2008
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Attachment Methods for the Electro-Mechanical 1-Wire Contact Package11/26/2007
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Understanding Flip-Chip and Chip-Scale Package Technologies and Their Applications4/18/2007
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Xilinx® FPGA IFF Copy Protection with 1-Wire® SHA-1 Secure Memories6/21/2006
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White Paper 9: Are SHA-1 Devices Still Secure Enough?5/19/2005
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White Paper 1: SHA Devices Used in Small Cash Systems12/20/2002
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White Paper 8: 1-Wire® SHA-1 Overview9/10/2002
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White Paper 3: Why are 1-Wire SHA-1 Devices Secure?6/7/2002
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White Paper 5: Using 1-Wire APIs for Data Sheet Commands6/7/2002
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1-Wire Communication Through Software5/30/2002
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Challenge and Response with 1-Wire® SHA Devices3/12/2002
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Using the DS2480B Serial 1-Wire® Line Driver3/12/2002
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Maxim Digital Monetary Certificates3/8/2002
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Passwords in SHA Authentication2/22/2002
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Programming 1-Wire EPROM and EEPROM Memory Devices Using a PC1/2/2002
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Printed Circuit Board Identification Using 1-Wire® Products12/26/2001
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Understanding and Using Cyclic Redundancy Checks with Maxim 1-Wire and iButton Products3/29/2001
Design Resources
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