TIDA-00201

Differential Signal Conditioning Circuit for Current and Voltage Measurement Using Fluxgate Sensors

TIDA-00201

Design files

Overview

This design provides a 4-channel signal conditioning solution for differential ADCs integrated into a microcontroller measuring motor current using fluxgate sensors. Also provided is an alternative measurement circuit with external differential SAR ADCs as well as circuits for high-speed overcurrent and earth fault detection. Proper differential signal conditioning improves noise immunity on critical current measurements in motor drives. This reference design can help increase the effective resolution of the analog-to-digital conversion, improving motor drive efficiency.

Features
  • Designed to measure all three phase motor currents along with DC link current through 6A Fluxgate Sensors (Scalable to 50A)
  • Differential Signal Conditioning Circuit to interface Fluxgate Sensors with differential ADCs
  • Measures current and voltage through integrated differential ADCs of TI Delfino™  F2837xD microcontroller with a provision to interface the signal conditioning circuit with External ADCs
  • Two on-board 14-bit Dual Channel Simultaneous Sampling SAR ADCs with 4-wire SPI to interface with external motor controllers
  • < 0.1% DC accuracy of Signal Conditioning Circuit
  • Overload and Earth Fault Protections for each channels with < 100ns sensing delays

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.

TIDU569.PDF (6502 K)

Reference design overview and verified performance test data

TIDRBO2.PDF (1053 K)

Detailed schematic diagram for design layout and components

TIDRBO3.PDF (188 K)

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

TIDRBO4.PDF (735 K)

Detailed overview of design layout for component placement

TIDRBO6.ZIP (2429 K)

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

TIDC747.ZIP (1523 K)

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

TIDRBO5.PDF (3920 K)

PCB layer plot file used for generating PCB design layout

Products

Includes TI products in the design and potential alternatives.

C2000 real-time microcontrollers

TMS320F28075C2000™ 32-bit MCU with 120 MHz, FPU, TMU, 512 KB flash, CLA, SDFM

Data sheet document-pdfAcrobat PDF
C2000 real-time microcontrollers

TMS320F28075-Q1Automotive C2000™ 32-bit MCU with 120 MHz, FPU, TMU, 512 KB flash, CLA, SDFM

Data sheet document-pdfAcrobat PDF
C2000 real-time microcontrollers

TMS320F28076C2000™ 32-bit MCU with 120 MHz, FPU, TMU, 512 KB flash, CLA, CLB, SDFM

Data sheet document-pdfAcrobat PDF
C2000 real-time microcontrollers

TMS320F28374DC2000™ 32-bit MCU with 800 MIPS, 2xCPU, 2xCLA, FPU, TMU, 512 KB flash, EMIF, 12b ADC

Data sheet document-pdfAcrobat PDF
C2000 real-time microcontrollers

TMS320F28374SC2000™ 32-bit MCU with 400 MIPS, 1xCPU, 1xCLA, FPU, TMU, 512 KB flash, EMIF, 12b ADC

Data sheet document-pdfAcrobat PDF
C2000 real-time microcontrollers

TMS320F28375DC2000™ 32-bit MCU with 800 MIPS, 2xCPU, 2xCLA, FPU, TMU, 1024 KB flash, EMIF, 12b ADC

Data sheet document-pdfAcrobat PDF
C2000 real-time microcontrollers

TMS320F28375SC2000™ 32-bit MCU with 400 MIPS, 1xCPU, 1xCLA, FPU, TMU, 1024 KB flash, EMIF, 12b ADC

Data sheet document-pdfAcrobat PDF
C2000 real-time microcontrollers

TMS320F28375S-Q1Automotive C2000™ 32-bit MCU with 400 MIPS, 1xCPU, 1xCLA, FPU, TMU, 1024 KB flash, EMIF, 12b ADC

Data sheet document-pdfAcrobat PDF
C2000 real-time microcontrollers

TMS320F28376DC2000™ 32-bit MCU with 800 MIPS, 2xCPU, 2xCLA, FPU, TMU, 512 KB flash, EMIF, 16b ADC

Data sheet document-pdfAcrobat PDF
C2000 real-time microcontrollers

TMS320F28376SC2000™ 32-bit MCU with 400 MIPS, 1xCPU, 1xCLA, FPU, TMU, 512 KB flash, EMIF, 16b ADC

Data sheet document-pdfAcrobat PDF
C2000 real-time microcontrollers

TMS320F28377DC2000™ 32-bit MCU with 800 MIPS, 2xCPU, 2xCLA, FPU, TMU, 1024 KB flash, EMIF, 16b ADC

Data sheet document-pdfAcrobat PDF
C2000 real-time microcontrollers

TMS320F28377D-EPC2000™ Enhanced Product 32-bit MCU with 800 MIPS, 2xCPU, 2xCLA, FPU, TMU, 1 MB flash, EMIF, 16b ADC

Data sheet document-pdfAcrobat PDF open-in-new HTML
C2000 real-time microcontrollers

TMS320F28377D-Q1Automotive C2000™ 32-bit MCU with 800 MIPS, 2xCPU, 2xCLA, FPU, TMU, 1024 KB flash, EMIF, 16b ADC

Data sheet document-pdfAcrobat PDF
C2000 real-time microcontrollers

TMS320F28377SC2000™ 32-bit MCU with 400 MIPS, 1xCPU, 1xCLA, FPU, TMU, 1024 KB flash, EMIF, 16b ADC

Data sheet document-pdfAcrobat PDF
C2000 real-time microcontrollers

TMS320F28377S-Q1Automotive C2000™ 32-bit MCU with 400 MIPS, 1xCPU, 1xCLA, FPU, TMU, 1024 KB flash, EMIF, 16b ADC

Data sheet document-pdfAcrobat PDF
C2000 real-time microcontrollers

TMS320F28378DC2000™ 32-bit MCU with 800 MIPS, 2xCPU, 2xCLA, FPU, TMU, 1024 KB flash, CLB, EMIF, 12b ADC

Data sheet document-pdfAcrobat PDF
C2000 real-time microcontrollers

TMS320F28378SC2000™ 32-bit MCU with 400 MIPS, 1xCPU, 1xCLA, FPU, TMU, 1024 KB flash, CLB, EMIF, 12b ADC

Data sheet document-pdfAcrobat PDF
C2000 real-time microcontrollers

TMS320F28379DC2000™ 32-bit MCU with 800 MIPS, 2xCPU, 2xCLA, FPU, TMU, 1024 KB flash, CLB, EMIF, 16b ADC

Data sheet document-pdfAcrobat PDF
C2000 real-time microcontrollers

TMS320F28379D-Q1Automotive C2000™ 32-bit MCU w/ 800 MIPS, 2xCPU, 2xCLA, FPU, TMU, 1024 KB flash, CLB, EMIF, 16b ADC

Data sheet document-pdfAcrobat PDF
C2000 real-time microcontrollers

TMS320F28379SC2000™ 32-bit MCU with 400-MIPS, 1x CPU, 1x CLA, FPU, TMU, 1024-KB flash, CLB, EMIF and 16-b ADC ;

Data sheet document-pdfAcrobat PDF
Comparators

TLC372Dual General Purpose LinCMOS™ Differential Comparator

Data sheet document-pdfAcrobat PDF
Fully differential amplifiers

THS4531Ultra low power 0.25mA, RRO, fully differential amplifier

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

OPA322Single, 5.5-V, 20-MHz, 65-mA output current, low noise (8.5-nV/√Hz) operational amplifier

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

TLV700200-mA, high-PSRR, low-IQ, low-dropout voltage regulator with enable

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

TPS7A471-A, 36-V, low-noise, high-PSRR, low-dropout voltage regulator with enable

Data sheet document-pdfAcrobat PDF open-in-new HTML
Precision ADCs (<=10MSPS)

ADS725412 Bit, 1 MSPS, Dual, Simultaneous Sampling Differential SAR ADC

Data sheet document-pdfAcrobat PDF open-in-new HTML
Precision ADCs (<=10MSPS)

ADS7854SAR ADC, dual, differential input, 1 MSPS, 14-bit, simultaneous sampling

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

REF30252.5-V, 50-ppm/°C, 50-µA in 3-pin SOT-23 package series (bandgap) voltage reference

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

REF50252.5-V, 3-µVpp/V noise, 3-ppm/°C drift precision series voltage reference

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

Technical documentation

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Type Title Date
* Design guide Differential Signal Conditioning Circuit for Current and Voltage Measurement Oct. 24, 2014
White paper Piccolo™ C2000™ MCUs enable the next generation of low-cost, dual-axis servo dri (Rev. A) Jul. 13, 2020

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