Analog Devices Inc./Maxim Integrated DS2502P+T&R

Overview

DS2502P+T&R from Maxim Integrated is a 1-Wire add-only memory IC with factory-lasered 64-bit ROM ID, 1024-bit EPROM partitioned into four 256-bit pages, page-level write protection, and parasitic power operation from a single data line. It enables traceable calibration storage, asset tagging, and revision tracking in industrial sensors and medical consumables.

For engineers reviewing the DS2502P+T&R datasheet, DS2502P+T&R pinout, DS2502P+T&R application, or DS2502P+T&R equivalent, key selection criteria include 1-Wire interface compatibility, TSOC-6 package footprint, -40°C to +85°C operating range, 12V programming voltage requirement, and guaranteed unique 48-bit serial number per unit.

Technical Context

The DS2502P+T&R implements a hierarchical 1-Wire protocol requiring ROM function commands (e.g., Read ROM, Skip ROM) before accessing EPROM via memory function commands (e.g., Read Memory [F0h], Write Memory [0Fh]). Its parasitic power architecture stores charge on an internal capacitor during high bus states to sustain operation during low periods.

EPROM programming uses 12V pulses applied to the 1-Wire line for 480 µs per byte, with bit-level programming from 1→0 only; status bytes support page write-protection and one's-complement page address redirection for software patching without overwriting.

Key Specifications

Pinout & Package

DS2502P+T&R is supplied in a 6-pin TSOC (Thin Small Outline Carrier) package, surface-mount compatible with standard reflow processes. Pin 1 = DATA (1-Wire I/O), Pin 2 = GND, Pins 3–6 = NC (no internal connection).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 1-Wire memory applications.

Compared with DS2502P+T&R, DS2430A+ offers rewrite flexibility but sacrifices absolute traceability and tamper resistance, while DS28EC20 adds cryptographic assurance at the expense of complexity and cost - DS2502P+T&R remains optimal for cost-sensitive, high-volume traceability where data immutability and simplicity are primary.

Availability

DS2502P+T&R is available at Aetrix Electronics and suitable for industrial sensor calibration, medical consumable authentication, and asset lifecycle tracking requiring stable component supply across multi-year production programs.

Supply support for DS2502P+T&R 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 systems.

The DS2502P+T&R belongs to Maxim's 1-Wire memory product line, engineered specifically for low-pin-count, parasitic-powered identification and immutable data logging in space-constrained embedded systems.

FAQ

What is the function of the 64-bit ROM in DS2502P+T&R?

The 64-bit ROM in DS2502P+T&R contains a factory-lasered, guaranteed unique identifier comprising an 8-bit family code (09h), 48-bit serial number, and 8-bit CRC. This ROM is used during 1-Wire initialization to singulate the device on a multidrop bus and authenticate its identity before accessing the EPROM - it cannot be altered after manufacture and ensures absolute traceability per unit.

Can DS2502P+T&R be programmed without an external 12V supply?

No. DS2502P+T&R requires a 11.5V–12.0V programming pulse on the 1-Wire line for 480 µs per byte to program EPROM bits from 1→0. The device draws this voltage directly from the bus master - standard 3.3V or 5V microcontroller GPIOs cannot generate this voltage, so a dedicated 12V driver circuit or 1-Wire programmer (e.g., DS9097U) is mandatory for programming DS2502P+T&R.

How does page address redirection work in DS2502P+T&R?

DS2502P+T&R uses four Page Address Redirection Bytes in its EPROM Status Memory. When a value other than 0xFFH is written to a redirection byte (e.g., 0xFDH for page 1), the host software interprets it as "read page 2 instead" using one's complement logic. This allows software to logically replace outdated data without physically overwriting - the original page remains intact and readable only if redirection is disabled.

Is DS2502P+T&R compatible with standard 1-Wire readers?

Yes. DS2502P+T&R complies fully with the 1-Wire protocol specification, including ROM function commands (Read ROM, Skip ROM) and memory function commands (Read Memory [F0h], Write Memory [0Fh]). It operates at standard speed (16.3 kbps) and supports presence detection, making it interoperable with industry-standard 1-Wire masters such as DS2480B, MAX31826, or microcontroller-based bit-banged implementations.

What is the difference between DS2502P+T&R and DS2502+T&R?

DS2502P+T&R uses a 6-pin TSOC package with pins 1 (DATA) and 2 (GND), while DS2502+T&R uses a 3-pin TO-92 package with identical pinout (pin 1 = DATA, pins 2/3 = GND). Both share identical electrical specifications, memory structure, and 1-Wire behavior - the "P" suffix denotes TSOC packaging, optimized for automated SMT assembly, whereas the base DS2502+T&R is through-hole compatible.