DS28E18
1-Wire® to I2C/SPI Bridge with Command Sequencer
1-Wire Slave to I2C or SPI Master Bridge Device Which Is Parasitically Powered from a Host Microcontroller.
Top
Overview
Features and Benefits
- 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
Product Details
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 Maxim's 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
Product Categories
Product Lifecycle
Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Evaluation Kits (1)
Documentation & Resources
Tools & Simulations
Software Development
Reference Designs (3)
Design Resources
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal.
Support & Discussions
Sample & Buy
Ordering FAQs
See our Ordering FAQs for answers to questions about online orders, payment options and more.
Buy Now Pricing
(**) Displayed Buy Now Price and Price Range is based on small quantity orders.
List Pricing
(*)The 1Ku list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.
Lead Times
Please see the latest communication from our CCO regarding lead times.
Sampling
Selecting the Sample button above will redirect to the third-party ADI Sample Site. The part selected will carry over to your cart on this site once logged in. Please create a new account there if you have never used the site before. Contact SampleSupport@analog.com with any questions regarding this Sample Site.
Evaluation Boards
Pricing displayed is based on 1-piece.
Up to two boards can be purchased through Analog.com. To order more than two, please purchase through one of our listed distributors.
Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.