Analog Devices Inc./Maxim Integrated DS28E07P+

Overview

DS28E07P+ from Analog Devices is a 1024-bit, 1-Wire® EEPROM organized as four 256-bit user memory pages with individual write protection and EPROM-emulation mode (1→0 only), factory-programmed 64-bit ROM ID for node addressing, 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 modules.

For engineers reviewing the DS28E07P+ datasheet, DS28E07P+ pinout, DS28E07P+ application, or DS28E07P+ equivalent, key selection considerations include 1-Wire interface timing (15.4kbps/125kbps), per-page protection control, scratchpad-based write verification, ±8kV HBM ESD rating on IO, and TO-92 package compatibility with parasitic power operation.

Technical Context

The DS28E07P+ implements a single-wire, open-drain 1-Wire bus interface requiring only one data line and ground, with built-in switchpoint hysteresis and noise filtering. Communication occurs at standard speed (65µs time slot) or overdrive speed (9µs time slot), supporting reset, presence-detect, read, and write cycles defined by precise timing windows.

Memory architecture includes four 32-byte user EEPROM pages, an 8-byte scratchpad buffer, 64-bit administrative data (protection bytes, manufacturer ID), and a laser-programmed 64-bit ROM ID. Write operations require two-phase execution: first writing to scratchpad, verifying contents (including CRC-16), then copying to EEPROM with self-timed 12ms programming cycle.

Key Specifications

Pinout & Package

DS28E07P+ is supplied in TO-92 package (3-lead, through-hole), with Pin 1 = N.C., Pin 2 = IO (1-Wire bus interface, open-drain), Pin 3 = GND. External pullup resistor (300Ω–2200Ω) required on IO for proper 1-Wire signaling.

Key Features

Applications

Equivalent & Alternatives

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

Compared with DS28E07P+, DS28EC20+T&R offers double memory and higher endurance but requires firmware adaptation, while DS2431+T&R provides functional overlap for simple ID tasks at lower cost but omits critical security features like EPROM emulation and copy protection.

Availability

DS28E07P+ is available at Aetrix Electronics and suitable for accessory identification, medical sensor calibration, smart transducer data storage, and after-market consumables management requiring stable component supply and long-term lifecycle support.

Supply support for DS28E07P+ 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 semiconductor leader specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision instrumentation, industrial, and healthcare applications.

The DS28E07P+ belongs to Analog Devices' 1-Wire secure memory product line, designed specifically for tamper-resistant identification, calibration storage, and consumables lifecycle tracking in resource-constrained embedded systems.

FAQ

What is the function of the scratchpad in DS28E07P+?

The scratchpad in DS28E07P+ is an 8-byte volatile buffer used exclusively for write verification. Before committing data to EEPROM, the host writes to the scratchpad, reads it back, and validates integrity (e.g., via CRC-16). Only upon confirmation does the Copy Scratchpad command transfer contents to the target memory page - ensuring no corrupted data is permanently stored in DS28E07P+.

Does DS28E07P+ require an external power supply (VCC)?

No, DS28E07P+ operates in parasitic power mode using only the IO and GND pins. It harvests energy from the 1-Wire bus during active communication, eliminating the need for a dedicated VCC connection. This simplifies PCB design and reduces component count - a core advantage of DS28E07P+ in space-constrained applications like ink cartridges.

How does EPROM-emulation mode work in DS28E07P+?

In EPROM-emulation mode (enabled by writing AAh to a page's protection byte), DS28E07P+ performs a bitwise AND between incoming data and existing EEPROM contents. This allows bits to transition only from 1 to 0 - enabling nonvolatile, nonresettable counters. For example, decrementing a 32-bit usage counter requires pre-initializing the page to 0xFF and clearing bits sequentially - a verified behavior of DS28E07P+.

Can DS28E07P+ be used in multidrop 1-Wire networks?

Yes, DS28E07P+ is explicitly designed for multidrop 1-Wire networks. Its factory-programmed 64-bit ROM ID serves as a unique node address, allowing a single master to communicate with multiple DS28E07P+ devices on the same bus using Match ROM or Search ROM commands - essential for systems with multiple calibrated sensors or accessories sharing one microcontroller port.

What is the maximum recommended pullup resistance for DS28E07P+ IO line?

The maximum recommended pullup resistance for DS28E07P+ IO is 2200Ω under standard-speed operation with a single device on the bus. Lower values (e.g., 1kΩ) improve noise immunity and rise time but increase power consumption. The DS28E07P+ datasheet specifies 300Ω–2200Ω as the valid range - exceeding 2200Ω risks timing violations during reset or presence-detect cycles.