TIDA-00316

Interfacing Current Output Hall Sensors and CTs with Pseudo-differential ADC/MCU Reference Design

TIDA-00316

Design files

Overview

This reference design provides interfacing current output Hall sensors and current transformers to pseudo-differential ADC (standalone and integrated into MCU). Two variants of signal conditioning circuits are designed to measure motor current using bipolar and unipolar supply voltages respectively. Both of the signal conditioning circuits provide current measurement accuracy within ±0.5% for an operating temperature range from -25°C to 75°C.

Features
  • On-board current-output Hall sensor to measure nominal current up to 25-A RMS
  • Current measurement accuracy of 0.5%
  • Common reference for interfacing both CT and current output Hall sensor with pseudo-differential ADC/MCU
  • Two different variants to work on unipolar and bipolar supply rails
  • Designed to evaluate with Delfino F2837x control card
  • Designed to evaluate with external ADC (ADS7253) for interfacing with motor controller

A fully assembled board has been developed for testing and performance validation only, and is not available for sale.

Design files & products

Design files

Download ready-to-use system files to speed your design process.

TIDUA44A.PDF (15424 K)

Reference design overview and verified performance test data

TIDRF95.PDF (1324 K)

Detailed schematic diagram for design layout and components

TIDRF96.PDF (65 K)

Complete listing of design components, reference designators, and manufacturers/part numbers

TIDRF97.ZIP (161 K)

Detailed overview of design layout for component placement

TIDRF99.ZIP (6485 K)

Files used for 3D models or 2D drawings of IC components

TIDCAG7.ZIP (644 K)

Design file that contains information on physical board layer of design PCB

TIDRF98.PDF (284 K)

PCB layer plot file used for generating PCB design layout

Products

Includes TI products in the design and potential alternatives.

Precision op amps (Vos<1mV)

OPA219236-V, Precision, RRIO, Low Offset Voltage, Low Input Bias Current Op Amp With e-trim

Data sheet document-pdfAcrobat PDF open-in-new HTML
Buck converters (integrated switch)

TPS621503–17V 1A Step-Down Converter with DCS-Control in 3x3 QFN package

Data sheet document-pdfAcrobat PDF open-in-new HTML
Comparators

TLV1702Dual high voltage, low power comparator

Data sheet document-pdfAcrobat PDF open-in-new HTML
General-purpose op amps

OPA2322Dual, 5.5-V, 20-MHz, low noise (8.5-nV/√Hz), RRIO operational amplifier

Data sheet document-pdfAcrobat PDF open-in-new HTML
Linear & low-dropout (LDO) regulators

LP2992250-mA, 16-V, low-dropout voltage regulator with enable

Data sheet document-pdfAcrobat PDF open-in-new HTML
Linear & low-dropout (LDO) regulators

TPS7A30200-mA, low-noise, high-PSRR, negative, adjustable low-dropout voltage regulator with enable

Data sheet document-pdfAcrobat PDF open-in-new HTML
Linear & low-dropout (LDO) regulators

TPS7A49150-mA, 36-V, low-noise, high-PSRR, adjustable low-dropout voltage regulator with enable

Data sheet document-pdfAcrobat PDF open-in-new HTML
Series voltage references

REF20258-ppm/°C drift, low-power, dual-output Vref & Vref/2 voltage reference

Data sheet document-pdfAcrobat PDF open-in-new HTML
Series voltage references

REF20333.3-V Vref, low-drift, low-power, dual-output Vref & Vref/2 voltage reference

Data sheet document-pdfAcrobat PDF open-in-new HTML

Technical documentation

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* Design guide Interfacing Current Output Hall Sensors and CTs Design Guide (Rev. A) Aug. 07, 2015

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