MAXREFDES9000: Remote two-wire power supply and control I2C and SPI interface sensor based on DS28E18

The MAXREFDES9000 is a reference design showcasing the DS28E18 that demonstrates how to both operate and power remote I2C and serial peripheral interface (SPI) sensors using only two wires. The DS28E18 is an easy-to-use bridge integrated circuit (IC) that operates as a 1-Wire® slave device to a host controller. The IC provides a 512-byte command sequencer that is loaded with commands and control data to operate an I2C or SPI device that is interfaced to the DS28E18. Once loaded, the host controller sends a 1-Wire command to autonomously execute the sequence, power, and collect data from the attached peripherals. A subsequent 1-Wire command reads collected data. Power for the attached sensors or peripherals is sourced from the 1-Wire line enabling a very efficient solution to remotely power and control complex devices such as environmental sensors, analog-to-digital converters (ADCs), digital-to-analog converters (DACs), and display controllers. The MAXREFDES9000 is designed to work as a remotely operated environmental monitoring system. This system includes a Liquid Crystal Display (LCD) screen to display the conditions of a variety of remote I2C and SPI sensors, each used to examine environmental conditions such as temperature and humidity.

特征

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