Analog Devices Inc./Maxim Integrated DS2502-E48+

Overview

DS2502-E48+ from Maxim Integrated is a factory-programmed 48-bit node address chip with 768-bit user-programmable OTP-EPROM, implementing the 1-Wire® protocol on a single bidirectional pin. It provides a globally unique MAC-48/EUI-48 Ethernet address, features a laser-traceable 64-bit ROM registration number, and operates from 2.8V to 6.0V over -40°C to +85°C.

For engineers reviewing the DS2502-E48+ datasheet, DS2502-E48+ pinout, DS2502-E48+ application, or DS2502-E48+ equivalent, this device serves as a low-cost, single-pin-addressable identity and node addressing solution for industrial asset tagging, secure peripheral identification, and embedded system serialization where traceability and minimal I/O count are critical.

Technical Context

The DS2502-E48+ implements the 1-Wire® bus protocol with presence detection, CRC16 validation (inverted polynomial X¹⁶+X¹⁵+X²+1), and multidrop compatibility. Its ROM contains a custom family code 89h and UniqueWare Identifier 5E7h, distinguishing it from standard DS2502 variants while maintaining identical electrical and logical behavior.

The first 32 bytes store a fixed-length UDP (Universal Data Packet) structure: length byte (0Ah), 4-byte Project ID (00001129h), 6-byte 48-bit node address (24-bit IEEE company ID 006035h + 24-bit extension ID), and inverted 2-byte CRC. Addresses 0Dh–1Fh are permanently FFh; addresses 20h–7Fh are user-programmable and write-protectable via status memory bits.

Key Specifications

Pinout & Package

DS2502-E48+ is supplied in a lead(Pb)-free TO-92 package (3-pin, through-hole) with pin 1 (leftmost when flat side faces viewer, leads down) designated as V_DD/Data, pin 2 as GND, and pin 3 as NC (no connection). The device uses parasitic power mode - no external V_DD required during normal operation.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar node addressing and 1-Wire identity applications.

Compared with DS2502-E48+, DS2401+ offers simpler identification but no address or data storage, while DS2430A+ enables full EEPROM flexibility but shifts address assignment and CRC validation to host firmware - DS2502-E48+ uniquely delivers certified EUI-48, UDP structure, and factory traceability in one low-pin-count device.

Availability

DS2502-E48+ is available at Aetrix Electronics and suitable for industrial asset tagging, secure peripheral identification, and embedded system serialization requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for DS2502-E48+ 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, communications, and computing applications.

The DS2502-E48+ belongs to Maxim's 1-Wire® identity and memory product line, engineered specifically for secure, low-pin-count device identification, traceability, and field-updatable metadata storage in harsh or space-constrained environments.

FAQ

What is the primary function of the DS2502-E48+ in a 1-Wire system?

The DS2502-E48+ serves as a factory-programmed node address chip that delivers a globally unique 48-bit MAC-48/EUI-48 identifier and supports user-programmable OTP-EPROM storage. Its core role is to provide tamper-resistant device identity and traceability on multidrop 1-Wire buses without requiring additional address or control lines. The DS2502-E48+ integrates presence detection, CRC-validated UDP data structure, and a unique 64-bit ROM registration number - all accessible via a single bidirectional pin.

Does the DS2502-E48+ require an external power supply?

No, the DS2502-E48+ operates in parasitic power mode using only the 1-Wire data line and ground. During normal read operations, it draws power from the data line through an external pullup resistor. An external V_DD is not required. Programming requires 11.5V–12.0V applied to the data line, but this high-voltage pulse is generated by the host reader - no separate V_DD pin or supply is needed on the DS2502-E48+ itself.

How is the 48-bit node address structured in the DS2502-E48+?

The DS2502-E48+ stores its 48-bit node address in a standardized UDP format beginning at memory address 00h: a length byte (0Ah), followed by the 4-byte UniqueWare Project ID (00001129h), then the 6-byte node address (24-bit IEEE company ID 006035h + 24-bit extension ID), and ending with an inverted 16-bit CRC. This structure ensures compatibility with 1-Wire APIs and enables automatic CRC validation during reads - a key feature distinguishing the DS2502-E48+ from generic ROM-only devices.

Can the DS2502-E48+ be reprogrammed after initial programming?

The DS2502-E48+ supports add-only programming: once a bit is set to '0', it cannot be changed back to '1'. However, unused EPROM cells (addresses 20h–7Fh) can be programmed incrementally without disturbing previously written data. The first 32 bytes (00h–1Fh), including the factory-programmed 48-bit node address and CRC, are permanently write-protected and cannot be altered. Programming requires 11.5V–12.0V pulses and is only supported from -40°C to +50°C.

What package options are available for the DS2502-E48+?

The DS2502-E48+ is offered exclusively in a lead(Pb)-free TO-92 package (3-pin, through-hole), as indicated by the "+" suffix in the part number. While the DS2502P-E48+ variant exists in TSOC surface-mount packaging, the DS2502-E48+ itself is specified only for TO-92. Pin 1 is V_DD/Data, Pin 2 is GND, and Pin 3 is NC - consistent with Maxim's standard 1-Wire TO-92 pinout and parasitic power implementation.