Skip to main content

4-20mA Current Loop Transmitter

Overview

Description

The 4-20mA current loop is the dominant standard for sensor systems across many industries due to its simplicity and efficiency. It is easy to configure and connect, requiring less wiring and fewer connections than other signal types, which helps reduce overall system costs. Additionally, it is ideal for large locations, as the current remains stable over long distances, unlike voltage signals that degrade.

This current loop transmitter design utilizes a precision digital power monitor (DPM), a stable power source, and the low-power, analog-rich capabilities of the 16-bit MCU.

System Benefits:

  • Analog and ultra-low power MCU optimized for detector and sensor applications.
  • High-voltage, adjustable VOUT, low quiescent current linear regulator suitable for "always-on" applications
  • Renesas' NanoPower voltage reference featuring low supply voltage operation at 310nA typical.

Comparison

Applications

Block Diagram

Select a block to discover products for your design

Available on Lab on the Cloud - Use our PC-based GUI to instantly start configuring and testing.

Launch Lab on the Cloud
4:3 ratio Sheet.1 Sheet.2 Sheet.3 Sheet.4 US199 US199 US199 Sensor with Analog Input Sensor with Analog Input Sensor with Analog Input Sensor Module with ADC Sensor Module with ADC Sensor Module with ADC Ground (earth) Sheet.22 Sheet.23 Sheet.24 Sheet.25 Sheet.115 Sheet.101 Sheet.102 Sheet.103 Sheet.104 Sheet.105 Sheet.106 Sheet.107 Sheet.108 Sheet.109 Sheet.110 Sheet.111 Sheet.112 Sheet.113 Sheet.114 Connector Arrow Connector Arrow.118 Connector Line Connector dotted line Connector Line.122 Connector double arrow Connector Line.124 Connector Line.125 Connector Line.126 Connector Line.127 Connector Line.128 Connector Line.129 Connector Line.130 Connector Line.131 Connector Line.132 Connector Line.134 Connector Line.135 Connector Line.137 Connector Line.138 Connector Line.139 Connector Line.140 Connector Line.141 Connector Line.142 Connector Line.143 Connector Line.144 Connector 1 Connector 1.146 Connector 1.147 Connector 1.148 Connector Line.150 Voltage Reference Voltage Reference Voltage Reference LDO LDO LDO Loop Input Protection Loop Input Protection Loop Input Protection Loop Power Loop Power Loop Power Op Amp Op Amp Op Amp RF Filter RF Filter RF Filter Resistor Resistor.20 Resistor.26 3.3V 3.3V 3.3V RL RL RL Up to 40V Up to 40V Up to 40V Total Resistance of Receiver and Transmission Line Total Resistance of Receiver and Transmission Line Total Resistance of Receiver and Transmission Line MCU MCU MCU MCU Op Amp/ADC Op Amp/ADC Op Amp/ADC I2C I2C I2C PWM PWM PWM
Exiting Interactive Block Diagram