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DS2502: 1Kb Add-Only Memory Data Sheet (Rev. 8)3/31/2015PDF677K
Overview
Features and Benefits
- Easily Add Traceability and Relevant Information to Any Individual System
- 1k-Bit EPROM with Page-Level Write Protection and Guaranteed Unique 64-Bit ROM ID Chip for Absolute Traceability
- 1024 Bits Electrically Programmable Read Only Memory (EPROM)
- Unique, Factory-Lasered and Tested 64-Bit Registration Number (8-Bit Family Code + 48-Bit Serial Number + 8-Bit CRC Tester)
- EPROM Partitioned into Four 256-Bit Pages for Randomly Accessing Packetized Data
- Each Memory Page Can Be Permanently Write- Protected to Prevent Tampering
- Device is an Add Only Memory Where Additional Data Can Be Programmed into EPROM Without Disturbing Existing Data
- Architecture Allows Software to Patch Data by Superseding an Old Page in Favor of a Newly Programmed Page
- 8-Bit Family Code Specifies DS2502 Communications Requirements to Reader
- Minimalist 1-Wire Interface Lowers Cost and Interface Complexity
- Reduces Control, Address, Data, Power, and Programming Signals to a Single Data Pin
- Directly Connects to a Single Port Pin of a Microprocessor and Communicates at up to 16.3kb Per Second
- Built-In Multidrop Controller Ensures Compatibility with Other 1-Wire Net Products o Presence Pulse Acknowledges When the Reader First Applies Voltage
- Low Cost TO-92, SFN, or 8-Pin SO, SOT-23 (3 Pin), TSOC and WLP Surface Mount Package
- Wide Voltage and Temperature Operating Ranges Provide Robust System Performance
- Reads Over Voltage Range of 2.8V to 6.0V at -40°C to +85°C
- Zero Standby Power Required
- Programs at 11.5V to 12.0V from -40°C to +50°C
Product Details
The DS2502 1Kb Add-Only Memory identifies and stores relevant information about the product to which it is associated. This lot- or product-specific information can be accessed with minimal interface—for example, a single port pin of a microcontroller. The DS2502 consists of a factory-lasered registration number that includes a unique 48-bit serial number, an 8-bit CRC, and an 8-bit Family Code (09h) plus 1Kb of EPROM which is user-programmable. The power to program and read the DS2502 is derived entirely from the 1-Wire® communication line.
Data is transferred serially via the 1-Wire protocol which requires only a single data lead and a ground return. The entire device can be programmed and then write-protected if desired. Alternatively, the part may be programmed multiple times with new data being appended to, but not overwriting, existing data with each subsequent programming of the device. Note: Individual bits can be changed only from a logical 1 to a logical 0, never from a logical 0 to a logical 1. A provision is also included for indicating that a certain page or pages of data are no longer valid and have been replaced with new or updated data that is now residing at an alternate page address. This page address redirection allows software to patch data and enhance the flexibility of the device as a stand-alone database. The 48-bit serial number that is factory-lasered into each DS2502 provides a guaranteed unique identity which allows for absolute traceability. The familiar TO-92 or SOIC or TSOC packages provide a compact enclosure that allows standard assembly equipment to handle the device easily for attachment to printed circuit boards or wiring. Typical applications include storage of calibration constants, maintenance records, asset tracking, product revision status, and access codes.
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 (5)
Documentation & Resources
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DS2502 Reliability Data1/12/2023PDF22K
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Maxim Wafer-Level Package Assembly Guide11/12/2004
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1-Wire Search Algorithm3/28/2002
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Creating Global Identifiers Using 1-Wire® Devices1/21/2002
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Reading and Writing 1-Wire® Devices Through Serial Interfaces3/29/2001
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NEW
Advanced 1-Wire Network Driver2/14/2023
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How to Build a 1-Wire® Evaluation Kit5/14/2012
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Protecting 5V 1-Wire® Slaves from Overvoltage Exposure5/30/2011
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Injection Molding an IC into a Connector or Consumable Item8/3/2010
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Tutorial: Improve Sensor Performance and SNR in Pulse Oximeter Designs6/21/2010
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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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Understanding Flip-Chip and Chip-Scale Package Technologies and Their Applications4/18/2007
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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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TINIm390 Verification Module Chipset Reference Design3/28/2002
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Using the DS2480B Serial 1-Wire® Line Driver3/12/2002
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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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Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.