Maxim Integrated Release DS28E18 1-Wire®-to-I²C/SPI Bridge IC
The DS28E18 requires only 2 wires for connecting to remote sensors up to 100m away
Designers expanding connections to remote sensor networks can now reduce complexity and cost to the industry’s lowest levels
with the DS28E18 1-Wire®-to-I²C/SPI Bridge from Maxim Integrated (now part of Analog Devices). By leveraging Maxim Integrated’s 1-Wire protocol to interface with I²C and SPI-compatible sensors,
the DS28E18 reduces complexity by connecting devices using only two wires compared to competitive solutions that require four wires for I²C or six for SPI.
Nowadays, most designers use serial interfaces to connect remote sensors in industrial and remote monitoring applications. However, the most popular protocols are costly and complex because they require up to five external switch extenders to reach devices at distances as long as 100 meters. In addition, some of the interfaces widely deployed today require six cables for connecting multiple extended sensors to a host microcontroller.
“Sensors are transforming consumer, industrial and healthcare products as they enhance data collection and make for more intelligent operation,” said Manuel Tagliavini, principal analyst, MEMS and Sensors at Omdia. “However, serial interfaces to these sensors dominate the market and any approach that can help reduce the complexity will be a boon for developers.”
The DS28E18 enables both power and communications on a single wire, using Maxim Integrated’s 1-Wire protocol to link with I²C or SPI peripheral devices over 100 meters with only two wires. The solution eliminates up to five extender and switch ICs, significantly reducing connection costs and software complexity. In addition, only one programmable I/O port from the host microcontroller is necessary to operate a network with 10 to 20 nodes.
“As sensors become more prevalent in a number of applications, so does the need to extend connectivity over longer distances,” said Scott Jones, managing director, Embedded Security at Maxim Integrated. “To cost effectively extend the operating distance for serial interface devices invokes a great deal of complexity, but using 1-Wire protocol greatly simplifies these networks with simpler software and fewer cables and ICs.”
Features of the DS28E18 1-Wire® to I²C/SPI Bridge
- 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
For more information on the DS28E18 1-Wire® to I²C/SPI Bridge, visit the Maxim Integrated website at
Maxim Integrated DS28E18 product page
The Maxim Integrated website address is www.maximintegrated.com.
[Reprinted with kind permission from Maxim Integrated - Release Date 12th August, 2020]