DS28E18
Info: : PRODUCTION
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DS28E18

1-Wire® to I2C/SPI Bridge with Command Sequencer

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1-Wire Slave to I2C or SPI Master Bridge Device Which Is Parasitically Powered from a Host Microcontroller.

Info: : PRODUCTION tooltip
Info: : PRODUCTION tooltip
Part Details
Part Models 2
1ku List Price Starting From $0.80
Features
  • Operate Remote I2C or SPI Devices Using Single-Contact 1-Wire Interface
    • Extending I2C/SPI Communication Distance
    • Reduce Six Wires (for SPI) or Four Wires (for I2C) to Two Wires
    • 512-Byte Sequencer for Autonomous Operation of Attached Devices
    • Two Configurable GPIO Pins for Additional Peripheral Control
  • No External Power Required
    • DS28E18 Parasitically Powered from 1-Wire
    • I2C/SPI Peripheral Power Derived from the 1-Wire Line
  • Flexible 1-Wire and I2C/SPI Master Operational Modes
    • Supports Standard (11kbps) and Overdrive (90kbps) 1-Wire Communication
    • 100kHz, 400kHz, and 1MHz for I2C Slaves
    • Up to 2.3MHz for SPI Slaves
  • Easy to Integrate
    • Small, 2mm x 3mm x 0.75mm, 8-Pin TDFN Package
    • -40°C to +85°C Operation
    • 2.97V to 3.63V Operating Voltage Range
Additional Details
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The DS28E18 is a simple communications bridge that resides at a remote SPI or I2C sensor and allows the sensor to be controlled by just two wires coming from the host system. It reduces the wire count from six (for SPI) or four (for I2C). These two wires use Analog Devises' 1-Wire protocol that combines power and signal on a single wire, and which is driven by the programmable I/O pins on the host's microcontroller. The 1-Wire network supports connection lengths up to 100m and 10 sensor nodes or more.

The IC provides a 512-byte command sequencer in SRAM that can be loaded with multiple I2C or SPI commands. Once loaded, the host controller sends a command to execute the sequence, power, and collect data from attached I2C or SPI peripherals. A subsequent 1-Wire command reads collected data. Power for attached sensors or peripherals is sourced from the 1-Wire line making the DS28E18 a very efficient solution to remotely power and control complex I2C or SPI devices such as sensors, ADCs, DACs, and display controllers.

When used as a bridge for I2C slave devices, the DS28E18 communicates at Standard mode (100kHz), Fast mode (400kHz) or Fast-mode Plus (Fm+, 1MHz). In SPI mode, multiple clock rates are supported up to 2.3MHz. Configuring for I2C or SPI operation is performed with a 1-Wire command; I2C is the power-on default. When operating in I2C mode, two programmable GPIO pins are available for additional peripheral control.

Each DS28E18 provides a unique and secure 64-bit ROM identification number (ROM ID) that serves as the device's address on the 1-Wire bus. Multiple DS28E18 devices can coexist with other devices in a 1-Wire network and be accessed individually without affecting other devices.​

Applications

  • Accessory Identification and Control
  • Equipment Configuration and Monitoring
  • Examining Environmental Conditions
  • Grain Elevator Monitoring
Part Models 2
1ku List Price Starting From $0.80

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Documentation

Documentation

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Part Model Pin/Package Drawing Documentation CAD Symbols, Footprints, and 3D Models
DS28E18Q+T
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DS28E18Q+U
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Evaluation Kit

Evaluation Kits 1

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DS28E18EVKIT

Evaluation Kit for the DS28E18

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DS28E18EVKIT

Evaluation Kit for the DS28E18

Evaluation Kit for the DS28E18

Features and Benefits

  • Driver Support for Windows 10/8/7
  • Fully Compliant with USB 2.0 Specification
  • USB Powered with No External Power Supply Required
  • Extended SPI/I2C Peripheral Module Connector for Rapid Prototyping of SPI/I2C Slaves

Product Detail

The DS28E18 evaluation system (EV system) provides the special hardware and software system to exercise the features of the DS28E18 1-Wire®-to-I2C/SPI bridge with command sequencer IC. The EV system consists of a DS28E18 EV kit board, a DS7505 peripheral module board, a MAX31722 peripheral module board, and a DS9481P-300# USB-to-1-Wire adapter for PC connectivity. The EV kit is compatible with Windows® operating systems.

Applications

  • Accessory Identification and Control
  • Equipment Configuration and Monitoring
  • Examining Environmental Conditions
  • Grain Elevator Monitoring
Reference Designs

Reference Designs 3

maxrefdes9004 board

C-source Reference for Operating the DS2485 Combined with a DS28E18 from a Cortex-M4 Microcontroller

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MAXREFDES9004

C-source Reference for Operating the DS2485 Combined with a DS28E18 from a Cortex-M4 Microcontroller

C-source Reference for Operating the DS2485 Combined with a DS28E18 from a Cortex-M4 Microcontroller

Features and Benefits

  • Dedicated 1-Wire Master for Convenient 1-Wire Processing
  • Up to 100m Remote Communication with Connected 1-Wire Slave Devices
  • C-Code Demonstrates How to Use the DS2485 in Software Including an Example with the DS28E18

Designed–Built–Tested

A simple, cost-efficient, 1-Wire master is demonstrated using the DS2485 for a simple sensor application using the MAX32660 host microcontroller. This reference design includes the following major components: one each of MAX32660 Cortex-M4 microcontroller, DS2485 1-Wire master, DS28E18 1-Wire to I2C/SPI bridge and an I2C temperature sensor module. This document describes the hardware shown above as well as its supplementing software. It provides a detailed, systematic technical guide to set up and understand the MAXREFDES9004 reference design. The system has been built and tested, details of which follow later in this document.

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Design & Integration Tools

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MAXREFDES9002

C-source Reference for Operating the DS28E18 from Cortex-M4 GPIO Pins

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MAXREFDES9002

C-source Reference for Operating the DS28E18 from Cortex-M4 GPIO Pins

C-source Reference for Operating the DS28E18 from Cortex-M4 GPIO Pins

Features and Benefits

Features

  • Power and communication to I2C and SPI sensors through two wires
  • 512-byte command sequencer for autonomous operation
  • Up to 10mA at 3.3V sensor power derived from 1-Wire
  • Up to 100m distance with the 1-Wire interface
  • Example C-code demonstrates how to interface to I2C and SPI sensors
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Design & Integration Tools

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609.24 K

MAXREFDES9000

Remote I2C and SPI Sensor Operation Using the DS28E18

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MAXREFDES9000

Remote I2C and SPI Sensor Operation Using the DS28E18

Remote I2C and SPI Sensor Operation Using the DS28E18

Features and Benefits

  • Power and communication to I2C and SPI sensors via two wires
  • 512-byte command sequencer for autonomous operation
  • Up to 10mA at 3.3V sensor power derived from 1-Wire
  • Up to 100m distance with the 1-Wire interface
  • Raspberry Pi® computer enables a powerful computing platform for creating an expansive system of sensors
  • Example source code demonstrates how to interface to various types of I2C and SPI sensors
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Part Used 1

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