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Features
- 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
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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.
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DS2502
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ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.
| Part Model | Pin/Package Drawing | Documentation | CAD Symbols, Footprints, and 3D Models |
|---|---|---|---|
| DS2502+ |
TO92
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| DS2502+T&R |
TO92
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| DS2502P+ |
Thin Small-Outline C-Lead
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| DS2502P+T&R |
Thin Small-Outline C-Lead
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| DS2502R+T&R |
Small-Outline Transistor Package
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| DS2502S+ |
Small-Outline IC, Narrow (0.15in)
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| DS2502S+T&R |
Small-Outline IC, Narrow (0.15in)
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| DS2502X1+ |
4-WLCSP-N/A
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| DS2502X1+U |
4-WLCSP-N/A
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- DS2502+
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Apr 14, 2020
- 1998A
ASSEMBLY
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Jul 19, 2016
- 1594_AMENDED
ASSEMBLY
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Feb 4, 2015
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May 22, 2018
- 1702N
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Oct 14, 2016
- 1594D
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Jul 19, 2016
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Oct 14, 2016
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Software & Part Ecosystem
Evaluation Kits 5
DS2502EVKIT
Evaluation Kit for the DS2502
Product Detail
The DS2502 Evaluation Kit makes performance evaluation, software development, and prototyping with the DS2502 1Kb Add-Only Memory easy. The evaluation board interfaces to a PC through a DS9123O USB Adapter and RJ-11 cable connection. The provided CD ROM contains all related data sheets along with the evaluation software, which can be run under any Windows operating system.
Separate control tabs allow the user access all DS2502's that are connected to the 1-Wire bus and access all memory locations of those devices.
Kit demonstration boards will vary as they are improved upon over time. For information on the demonstration board circuits refer to the individual board datasheets located inside the documentation directory on the DS2502K CD ROM.
DS9481R-3C7
USB-to-1-Wire/iButton Adapter
Features and Benefits
- Driver Support for Windows® 11 and Windows 10 Operating Systems
- Enumerates as a Virtual PC COM Port by Use of the Prolific PL-2303GC USB-to-UART Bridge IC
- Emulates the DS2480B 1-Wire Line Driving Functionality
- 1-Wire OTP/EPROM Programming Provided Without the Need of an External Power Supply (12V on OW, 7V on PULSE)
- 3.3V Read/Write Operation to 1-Wire/iButton Devices
- RJ11 Interface for Standard Connectivity Accessories such as the DS9120 Socket Adapter
- Supports Standard and Overdrive 1-Wire Communication
- Provides Strong Pullup to 3.3V
- Fully Compliant with USB 2.0 Specification
Product Detail
The DS9481R is a USB-to-1-Wire adapter for easy PC connectivity to 1-Wire devices. The adapter provides an RJ11 connector with the signals to communicate with all 1-Wire and iButton devices that support a 3.3V data I/O level. Additionally, the adapter provides the support and signaling to program 1-Wire/iButton EEPROM and one-time programmable (OTP)/EPROM devices. To provide a total hardware solution, the DS9481R can readily be used with the DS9120 socket adapter to create a 1-Wire PC programmer for 1-Wire peripheral devices (contact factory for more information). The equivalent peripheral hardware solution for the iButton is the DS1402D-DR8.
Resources
DS9120P
Socket Boards for Evaluating 1-Wire Devices
Product Detail
The DS9120 family of socket boards are RJ11-to-socket boards that provide the hardware connectivity necessary to evaluate and operate 1-Wire® products in an easy-to-use PC environment. Additionally, the socket boards can be readily used with the DS9481R USB-to1-Wire adapter to create a 1-Wire PC programmer for 1-Wire EEPROM and one-time programmable (OTP)/EPROM devices.
Resources
DS9120Q
Socket Boards for Evaluating 1-Wire Devices
Product Detail
The DS9120 family of socket boards are RJ11-to-socket boards that provide the hardware connectivity necessary to evaluate and operate 1-Wire® products in an easy-to-use PC environment. Additionally, the socket boards can be readily used with the DS9481R USB-to1-Wire adapter to create a 1-Wire PC programmer for 1-Wire EEPROM and one-time programmable (OTP)/EPROM devices.
DS9120
Socket Boards for Evaluating 1-Wire Devices
Product Detail
The DS9120 family of socket boards are RJ11-to-socket boards that provide the hardware connectivity necessary to evaluate and operate 1-Wire® products in an easy-to-use PC environment. Additionally, the socket boards can be readily used with the DS9481R USB-to1-Wire adapter to create a 1-Wire PC programmer for 1-Wire EEPROM and one-time programmable (OTP)/EPROM devices.