Analog Devices Inc./Maxim Integrated DS28E17Q+T

Overview

The DS28E17Q+T from Analog Devices is a 1-Wire-to-I2C bridge IC that enables I2C peripherals-including ADCs, DACs, display controllers, and sensors-to operate over a single-conductor 1-Wire bus. It supports standard (15kbps) and overdrive (77kbps) 1-Wire speeds, I2C clock stretching, and operates from 2.45V to 3.6V with 0.3µA sleep current. It serves as a node-level interface in distributed sensor or accessory identification systems.

For engineers reviewing the DS28E17Q+T datasheet, DS28E17Q+T pinout, DS28E17Q+T application, or DS28E17Q+T equivalent, key selection considerations include its unique 64-bit ROM ID for multidrop addressing, 100m 1-Wire reach at standard speed, support for both 100kHz and 400kHz I2C, open-drain IO pin with 2.2kΩ max pullup, and dedicated SLEEP/WAKEUP control pins for low-power system coordination.

Technical Context

The DS28E17Q+T integrates a 1-Wire physical layer controller, ROM ID engine, and full I2C bus controller in one die-enabling transparent packetized I2C data transfer via 1-Wire commands like WRITE DATA WITH STOP (4Bh) and READ DATA WITH STOP (87h). It implements automatic I2C clock stretching and supports both standard and overdrive 1-Wire timing modes.

Its architecture isolates the 1-Wire bus from I2C voltage domains: the IO pin is open-drain with programmable pullup dependency, while SDA/SCL are open-drain outputs requiring external pullups to their respective I2C bus supply. The AWAKE and BUSY pins provide real-time state feedback for host synchronization without polling.

Key Specifications

Pinout & Package

DS28E17Q+T uses a 4mm × 4mm × 0.75mm 16-pin TQFN package with exposed pad (EP), rated for -40°C to +85°C operation and θ_JA = 40°C/W.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 1-Wire-to-I2C bridge applications.

Compared with MAX31826ATM+ and DS28E05Q+T, the DS28E17Q+T uniquely delivers full bidirectional I2C protocol translation with hardware timing control, making it the sole option among these three for connecting arbitrary I2C peripherals (ADCs, DACs, displays) to a 1-Wire host.

Availability

DS28E17Q+T is available at Aetrix Electronics and suitable for industrial sensor networks, secure accessory identification systems, and remote display interfaces requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for DS28E17Q+T 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, Inc. is a global semiconductor leader specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision instrumentation, industrial automation, and communications.

The DS28E17Q+T belongs to Analog Devices' secure connectivity product line, designed specifically to extend trusted, low-pin-count interfaces-like 1-Wire-into complex I2C-based subsystems while preserving device identity and data integrity.

FAQ

What is the primary function of the DS28E17Q+T?

The DS28E17Q+T is a dedicated 1-Wire-to-I2C bridge IC that enables standard and fast-mode I2C peripherals (e.g., sensors, ADCs, display controllers) to be controlled over a single-conductor 1-Wire bus. It handles full protocol translation-including ROM ID addressing, packetized I2C command framing, clock stretching, and CRC validation-without requiring host firmware to manage low-level timing.

Does the DS28E17Q+T support both standard and overdrive 1-Wire speeds?

Yes, the DS28E17Q+T supports two 1-Wire communication speeds: standard mode (up to 15kbps) and overdrive mode (up to 77kbps). Mode selection is controlled via 1-Wire ROM commands (e.g., Overdrive-Skip ROM or Overdrive-Match ROM). The device automatically switches timing parameters upon entering overdrive mode, and returns to standard speed after a 480µs reset pulse.

How does the DS28E17Q+T handle I2C clock stretching?

The DS28E17Q+T fully supports I2C clock stretching: when an attached I2C peripheral holds SCL low to delay transmission, the DS28E17Q+T detects this condition and pauses 1-Wire response generation until the I2C transaction completes. This ensures timing-compliant interoperability with any I2C device that uses clock stretching for flow control or internal processing.

Can multiple DS28E17Q+T devices coexist on the same 1-Wire bus?

Yes, multiple DS28E17Q+T devices can coexist on a single 1-Wire bus. Each DS28E17Q+T has a factory-programmed, globally unique 64-bit ROM ID used for individual addressing via Match ROM or Search ROM commands. The 1-Wire protocol ensures that only the targeted DS28E17Q+T responds to subsequent Device commands, enabling true multidrop operation without contention.

What is the role of the AWAKE and BUSY pins on the DS28E17Q+T?

The AWAKE pin is a push-pull output indicating operational state (high = awake, low = asleep), useful for synchronizing companion devices. The BUSY pin is also push-pull and drives low after successful CRC validation of a 1-Wire packet, remaining low until the entire I2C transaction finishes-blocking further 1-Wire commands and enabling interrupt-driven host coordination without polling. Both pins are integral to deterministic low-power system design using the DS28E17Q+T.