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1-Wire protocol to provide a solution for building I²C and SPI sensor networks with remote connection

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Designers using connections to remote sensor networks now have the most cost-effective and simple solution available with the DS28E18, a 1-Wire-I2C/SPI bridge from Maxim Integrated.

Leveraging Maxim Integrated's 1-Wire protocol to interface with I2C and SPI-compatible sensors, the DS28E18 reduces system complexity with a connection based on only two wires compared to competing solutions that require four wires for I2C interfacing or six for SPI interfacing.

Today, most designers use serial interfaces to connect remote sensors in industrial and remote monitoring applications.

However, the most popular protocols are expensive and complex, requiring up to five external extenders to reach devices up to 100 metres away. In addition, some of the most commonly used interfaces today require 6 cables to connect multiple sensors to a host microcontroller.

TheDS28E18 uses a single wire for both power and data transmission, adopting Maxim Integrated's 1-Wire protocol for two-wire connection to I2C or SPI peripherals over 100 meters away.

The solution eliminates up to five extenders, significantly reducing connection costs and software complexity. In addition, only one host microcontroller I/O port is required to operate a network of 10 to 20 nodes.

Advantages

  • High Integration: connections are extended up to 100 metres, eliminating the need for up to five extenders; furthermore, there is no longer a need to supply an external power supply
  • Low cost: the device can operate autonomously with a two-wire connection, reducing the number of wires compared to a traditional solution by up to four.
  • Complexity Reduction: The device performs the conversion from 1-Wire protocol to I2C and SPI master interfaces, reducing the complexity of both the physical design and the software application running on the host microcontroller.
Comments

"Sensors are transforming consumer, industrial and electro-medical products as they improve data collection and make operation smarter," said Manuel Tagliavini, principal analyst, MEMS and Sensors at Omdia, "However, the serial interfaces used by these sensors dominate the market and any approach that can reduce complexity will be an advantage for developers."

"Assensors become more prevalent in many applications, the need to extend their connectivity over long distances grows," said Scott Jones, Director of Embedded Security at Maxim Integrated. "Cost-effectively extending the operating distance of devices with a serial interface involves a lot of complexity, but using the 1-Wire protocol greatly simplifies these networks with simpler software and fewer cables and ICs."

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