Analog Devices Inc./Maxim Integrated DS2502X1+

Overview

DS2502X1+ from Maxim Integrated is a 1-Wire add-only memory IC with factory-lasered 64-bit ROM ID, 1024-bit EPROM (4 × 256-bit pages), page-level write protection, and parasitic power operation - used for asset traceability, calibration storage, and maintenance logging in industrial sensors and medical devices.

For engineers reviewing the DS2502X1+ datasheet, DS2502X1+ pinout, DS2502X1+ application, or DS2502X1+ equivalent, this device supports single-pin 1-Wire communication at up to 16.3 kbps, operates from 2.8V–6.0V (−40°C to +85°C), requires 11.5–12.0V for programming, and delivers guaranteed unique identification via laser-programmed 48-bit serial number + 8-bit CRC + 8-bit family code (09h).

Technical Context

The DS2502X1+ implements a hierarchical 1-Wire protocol: ROM function commands (Read/Match/Search/Skip ROM) must precede memory access, enabling multi-drop network addressing. Its internal architecture includes a 8-bit scratchpad buffer, on-chip 8-bit CRC generator, and parasitic power harvesting circuitry that stores charge during high bus states to sustain operation during low states.

EPROM programming follows bit-wise 1→0 transitions only; data integrity is enforced via command/address/data CRC verification before each 480 µs 12V programming pulse. Page address redirection bytes (in status memory) allow software-level patching by invalidating old pages and mapping to new ones - no hardware erase required.

Key Specifications

Pinout & Package

DS2502X1+ uses a 4-terminal Wafer-Level Package (WLP), qualified for electro-mechanical contact applications. No soldering permitted. Laser-marked top side shows revision/date; contacts are not visible in standard top view.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar add-only memory applications.

Compared with DS2502X1+, DS2430A+ offers rewritable memory but sacrifices guaranteed uniqueness and page-level immutability, while DS28EC20 adds cryptographic security at the expense of power efficiency and design simplicity - DS2502X1+ remains optimal for cost-sensitive, tamper-proof traceability where data is written once and verified many times.

Availability

DS2502X1+ is available at Aetrix Electronics and suitable for industrial sensor calibration, medical device asset tracking, and smart meter firmware revision management requiring stable component supply and long-term lifecycle support.

Supply support for DS2502X1+ includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Maxim Integrated (now part of Analog Devices) designs precision analog, mixed-signal, and digital ICs for industrial, automotive, and communications applications.

The DS2502X1+ belongs to Maxim's 1-Wire memory product line, engineered specifically for low-pin-count, parasitic-powered identification and immutable data logging in resource-constrained embedded systems.

FAQ

What is the primary function of the DS2502X1+ in an embedded system?

The DS2502X1+ serves as a tamper-resistant, single-pin 1-Wire add-only memory IC that stores immutable calibration data, asset IDs, and maintenance logs. Its factory-lasered 64-bit ROM provides guaranteed unique identification, while its 1024-bit EPROM supports page-level write protection and software-driven page redirection - making DS2502X1+ ideal for traceability-critical applications where data must be appended but never altered or erased.

Does the DS2502X1+ require an external power supply?

No, the DS2502X1+ operates entirely on parasitic power harvested from the 1-Wire data line during high-voltage periods, eliminating the need for a dedicated V_CC pin or bypass capacitor. During read operations (2.8V–6.0V), it sustains functionality using internal capacitance; programming requires a separate 11.5–12.0V pulse applied to the same DATA line - confirming DS2502X1+'s true single-wire, zero-external-power architecture.

How does the DS2502X1+ ensure data integrity during programming?

The DS2502X1+ enforces data integrity through mandatory 8-bit CRC verification before every programming pulse: the bus master computes CRC over command, address, and data bytes; DS2502X1+ returns its own CRC for comparison. Only upon match does the 480 µs 12V pulse initiate bit-wise 1→0 programming. Post-pulse, the master reads back the target byte to confirm correct bit state - ensuring DS2502X1+ writes are both validated and verifiable.

Can the DS2502X1+ be used in multi-drop 1-Wire networks?

Yes, the DS2502X1+ includes a built-in multidrop controller compliant with the standard 1-Wire bus specification. Its 64-bit ROM ID enables unambiguous device enumeration via Search ROM commands, allowing dozens of DS2502X1+ units (and other 1-Wire devices) to coexist on a single data line - all addressed individually without contention, making DS2502X1+ suitable for distributed sensor arrays and modular equipment identification systems.

What package type does the DS2502X1+ use, and what are its assembly requirements?

The DS2502X1+ is supplied in a 4-terminal Wafer-Level Package (WLP), optimized for electro-mechanical contact interfaces - not solder reflow. Assembly requires spring-loaded pogo pins or compliant contact probes aligned to the laser-marked top surface; soldering voids qualification and risks damage. This WLP form factor enables ultra-compact integration into wearable sensors and disposable medical cartridges where DS2502X1+'s minimal footprint and contact-based interface deliver mechanical and electrical reliability.