Analog Devices Inc./Maxim Integrated DS28E07+W

Overview

DS28E07+W from Analog Devices is a 1024-bit, single-wire EEPROM IC organized as four 256-bit user memory pages, featuring individual page write protection and EPROM-emulation mode (1→0 only), factory-programmed unique 64-bit ROM ID, and operation across 3.0V–5.25V supply at -40°C to +85°C. It serves as a secure, low-pin-count identification and calibration data storage device in consumables and sensor systems.

For engineers reviewing the DS28E07+W datasheet, DS28E07+W pinout, DS28E07+W application, or DS28E07+W equivalent, key selection considerations include 1-Wire interface timing compliance (15.4kbps/125kbps), scratchpad-based write verification, per-page protection control, ±8kV HBM ESD rating on IO, and compatibility with IEEE P1451.4 smart sensor calibration architectures.

Technical Context

The DS28E07+W implements a parasitically powered 1-Wire interface with open-drain IO requiring external pullup, supporting both standard-speed (65µs time slot) and overdrive-speed (9µs time slot) protocols. Its memory architecture separates 128 bytes of user EEPROM (4×32-byte pages), 8-byte scratchpad, 8-byte administrative data (including four protection control bytes), and immutable 64-bit ROM ID.

Write operations follow a two-phase sequence: data is first loaded into the scratchpad with address-aligned 8-byte writes, then verified via CRC-16 or readback before initiating self-timed EEPROM programming (tPROG = 12ms). Protection modes are enforced at the page level via administrative byte settings-55h enables write protection, AAh enables EPROM-emulation mode-and persist after power cycle.

Key Specifications

Pinout & Package

DS28E07+W is supplied in TO-92 package (3-pin, through-hole), with Pin 1 = N.C., Pin 2 = IO (1-Wire bus interface, open-drain), Pin 3 = GND. The IO pin requires external pullup resistor (300Ω–2200Ω) and supports parasitic power mode.

Key Features

Applications

Equivalent & Alternatives

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

Compared with DS2431+T, DS28E07+W provides finer-grained memory control essential for multi-parameter calibration; compared with DS28EC20+T, it delivers identical EEPROM functionality at lower cost and power without cryptographic overhead - ideal for cost-sensitive, non-authentication use cases.

Availability

DS28E07+W is available at Aetrix Electronics and suitable for accessory identification, medical sensor calibration, analog smart sensor integration, ink/toner cartridge management, and aftermarket consumables tracking requiring stable component supply and long-term lifecycle support.

Supply support for DS28E07+W 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

Analog Devices is a global leader in high-performance analog, mixed-signal, and digital signal processing technologies, serving industrial, automotive, communications, and healthcare markets.

The DS28E07+W belongs to Analog Devices' 1-Wire secure memory product line, designed specifically for low-pin-count, tamper-resistant identification and calibration data storage in consumables and intelligent sensors.

FAQ

What is the primary function of the DS28E07+W in a system?

The DS28E07+W functions as a secure, low-pin-count 1-Wire EEPROM for storing immutable identification data (via its factory-programmed 64-bit ROM ID) and field-configurable calibration parameters. Its per-page write protection and EPROM-emulation mode enable robust, application-specific data governance - for example, locking ink cartridge serial numbers while allowing dynamic update of page-count counters. This makes DS28E07+W especially valuable in consumables and sensor calibration where data integrity and selective writability are critical.

Does the DS28E07+W require an external power supply?

No, the DS28E07+W operates in parasitic power mode using only the 1-Wire IO line and GND - no VCC pin is needed. During communication, it harvests energy from the IO line's pullup voltage (3.0V–5.25V); during EEPROM programming, a strong pullup (e.g., FET-bypassed resistor or driven logic-high IO) is recommended to meet the 1.2mA programming current requirement. This eliminates the need for dedicated power routing, simplifying design in compact accessories like toner cartridges or sensor probes where DS28E07+W is commonly deployed.

How does the scratchpad mechanism improve reliability of writes to the DS28E07+W?

The DS28E07+W uses an 8-byte scratchpad as an intermediate buffer: data is first written to the scratchpad, verified via CRC-16 or readback, and only then copied to EEPROM. This two-step process prevents partial or corrupted writes - if power loss occurs during programming, the original EEPROM contents remain intact. For DS28E07+W, the scratchpad also enforces 8-byte boundary alignment and integrates protection logic (e.g., loading existing data instead of new data when writing to a protected page), ensuring deterministic behavior even under fault conditions.

Can the DS28E07+W be used in multidrop 1-Wire networks?

Yes, the DS28E07+W is explicitly designed for multidrop 1-Wire networks. Its factory-programmed 64-bit ROM ID serves as a unique node address, enabling the bus master to select individual devices using Match ROM or Search ROM commands. The device supports all standard 1-Wire ROM function commands (Read ROM, Skip ROM, Resume, etc.) and memory commands (Write Scratchpad, Copy Scratchpad, Read Memory), allowing multiple DS28E07+W units - or mixed 1-Wire devices - to coexist on a single bus without conflict, which is essential in systems like multi-sensor medical diagnostics or modular industrial tooling where DS28E07+W provides per-unit calibration data.

What packaging and mounting options are available for the DS28E07+W?

The DS28E07+W is offered in TO-92 package (3-pin, through-hole), with pinout: Pin 1 = N.C., Pin 2 = IO, Pin 3 = GND. This package is optimized for manual or automated insertion into compact PCBs, such as those found in printer cartridges or handheld medical sensors. While other variants (e.g., TDFN, TSOC, SFN) exist for the DS28E07 family, the "+W" suffix specifically denotes the TO-92 version - confirmed by Analog Devices' official ordering information and package drawings. No surface-mount or alternative lead-form versions are associated with the DS28E07+W designation.