National Control Devices 1-Channel 4-20mA Current Loop Transmitter I2C Module

• 1-Channel 4-20mA Current Loop Transmitter I2C Mini Module
• Powering NCD I2C Interface Devices
• 12-Bit DAC MCP4725 / XTR115 4-20mA Current Loop
• Unlimited I2C Expansion / Quad Channel Digital Isolator
• One Channel 2 Wire 4-20mA Transmitter
• Wide Loop Supply Range 7.5V to 36V

The National Control Devices 1-Channel 4-20mA Current Loop Transmitter I2C Mini Module converts I2C Data into a 4-20mA Output using a 12-Bit Digital to Analog converter (DAC). Uses an XTR115 4-20mA Current Loop Transmitter connected to an MCP4725 Digital to Analog Converter. The MCP4725 has one address jumper, allowing 2 devices can be connected at the same time on a single I2C bus. 

It is also possible to connect more than 2 devices on one bus using the I2C multiplexer. The On-board XTR1115 4-20mA Current Loop Transmitter has a wide Loop supply range from 7.5V to 36V and on-board screw terminals which make it easy to connect. It also has a Vref exposed pad for external voltage reference with a preset Vref of 2.5V. A DAC value of about 670 will output 4mA of current; similarly, a value of about 3460 will output 20mA of current.