Overview

Description

The 4-20mA current loop is the dominant standard for sensor systems in many industries. This is because it is the simplest option to configure and connect. However, it also uses less wiring and connections than other signals, therefore reducing the overall system cost. In large locations, it is better for traveling long distances since the current doesn't degrade (unlike the voltage).

This design shows a possible transmitter solution with our precision digital power monitor (DPM), stable power source, and the low-power, analog-rich feature capabilities of our 16-bit RL78/I1D MCU.

System Benefits:

  • The RL78/I1D is an analog and ultra-low power MCU for detector and sensor applications
  • The ISL80410 is a high voltage, adjustable VOUT, low quiescent current linear regulator suited for "always-on" applications
  • Precision voltage from Renesas' ISL21080 Nanopower (310nA typical) voltage reference

Comparison

Applications

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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
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