CIRCUIT060007

Low-side, bidirectional current-sensing circuit

CIRCUIT060007

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Overview

This single-supply low-side, bidirectional current sensing solution can accurately detect load currents from –1A to 1A. The linear range of the output is from 110mV to 3.19V. Low-side current sensing keeps the common-mode voltage near ground, and is thus most useful in applications with large bus voltages.
Features
  • Single 5V supply with half-supply reference
  • Input: -2.22mV to 2.27mV differential
  • Output: 225mV - 4.72V 
  • Strain gauge resistance variation: 115 - 125 Ohms 
  • Gain: 1001V/V

Downloads

Design tool

Simulation for Low-Side, Bidirectional Current Sensing Circuit SBOC500.ZIP (297KB)

Supported products & hardware

Supported products & hardware

General-purpose op amps
OPA313 Single, 5.5-V, 1-MHz, low quiescent current (50-μA), RRIO operational amplifier TLV9062 Dual, 5.5-V, 10-MHz operational amplifier
MSP430 microcontrollers
MSP430FR2310 16 MHz integrated analog microcontroller with 2 KB FRAM, OpAmp, TIA, comparator with DAC, 10-bit ADC MSP430FR2311 16-MHz integrated analog microcontroller with 3.75-KB FRAM, OpAmp, TIA, comparator w/DAC, 10-bit ADC MSP430FR2353 24 MHz 105 C integrated analog microcontroller with 16 KB FRAM, Op-Amps/PGAs, 12-bit DACs, 12-bit AD MSP430FR2355 24-MHz 105-C integrated analog microcontroller with 32-KB FRAM, Op-Amps/PGAs, 12-bit DACs, 12-bit AD
Precision op amps (Vos<1mV)
LPV821 650nA, Precision Zero-Drift Nanopower Amplifier OPA376 Precision (0.025mV), low noise (7.5nV/rtHz), low quiescent current (760uA) op amp

Technical documentation

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Type Title Date
* Circuit design Low-side bidirectional current sensing circuit with MSP430™ smart analog combo (Rev. A) PDF | HTML 06 Mar 2020
* Circuit design Low-side, bidirectional current-sensing circuit (Rev. B) 01 Feb 2019
E-book Analog Engineer’s Circuit Cookbook: Amplifiers (Rev. B) 05 Oct 2022
E-book Simplifying Current Sensing (Rev. A) 09 Jan 2020
Application note How to Use the Smart Analog Combo in MSP430™ MCUs (Rev. A) PDF | HTML 24 Oct 2019
E-book Analog Engineer’s Circuit Cookbook: Amplifiers (Rev. A) 18 Feb 2019
User guide 0-A to 1-A Single-Supply Low-Side Current-Sensing Solution Design Guide (Rev. B) 11 Dec 2015
Design guide +/-1A Single-Supply Low-Side Current Sensing Solution Design Guide 08 Dec 2014

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