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DRV425 Evaluation Module
This user's guide describes the characteristics, operation, and use of the DRV425EVM. The DRV425 is
designed for open-loop magnetic field sensing using an integrated fluxgate. A complete circuit description
as well as schematic diagram and bill of materials is included.
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Trademarks
All trademarks are the property of their respective owners.
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Features
Full-featured Evaluation Board for the DRV425
Allows for the use of various user supplied compensation coils
On board or external reference option
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Introduction

The DRV425EVM is an evaluation module for the DRV425 integrated circuit. The DRV425 is designed for
magnetic field sensing applications, enabling isolated precision DC and AC field measurements. The
DRV425 features an integrated fluxgate sensor and all required analog signal conditioning circuits,
minimizing component count and cost.
SLOU410B - September 2015 - Revised April 2020
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Copyright © 2015-2020, Texas Instruments Incorporated
SLOU410B - September 2015 - Revised April 2020
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User's Guide
DRV425 Evaluation Module
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Summary of Contents for Texas Instruments DRV425EVM

  • Page 1: Table Of Contents

    On board or external reference option Introduction The DRV425EVM is an evaluation module for the DRV425 integrated circuit. The DRV425 is designed for magnetic field sensing applications, enabling isolated precision DC and AC field measurements. The DRV425 features an integrated fluxgate sensor and all required analog signal conditioning circuits, minimizing component count and cost.
  • Page 2: Magnetic Field Interface

    Figure 1. Magnetic Field Axis of Sensitivity Power Supply The DRV425EVM Board can be powered by a user provided 3.0 V to 5.5 V DC supply. The supply voltage is applied to J1 pin 4 (VDD) referenced to pin 3 (GND).
  • Page 3: Output Voltage

    DRV425 device. Reference voltages beyond VDD/2 will result in offset and gain errors. Output Voltage The output voltage of the DRV425EVM is located on J1 pin 2 and can be referred to the reference at J1 pin 2 or the power supply ground at J1 pin 3.
  • Page 4: Evm Operation

    EVM Operation Factory setup of the DRV425EVM is for an input supply voltage range from 3.3 V to 5 V. Resistors R3 through R8 configure the reference voltage and bandwidth settings of the DRV425EVM. The default conditions are listed in Table Table 2.
  • Page 5: Output Voltage Vs. Magnetic Field Strength

    -500 -400 -300 -200 -100 100 200 300 400 500 Magnetic Field B (uT) D002 Figure 4. Error vs. Magnetic Field Strength SLOU410B – September 2015 – Revised April 2020 DRV425 Evaluation Module Submit Documentation Feedback Copyright © 2015–2020, Texas Instruments Incorporated...
  • Page 6: Calculation Of Magnetic Field Strength 5 Schematic And Bill Of Materials

    Schematic and Bill of Materials www.ti.com Schematic and Bill of Materials The following pages contain the DRV425EVM Bill of materials, top level silkscreen and circuit schematic diagrams. Table 3. Bill of Materials DESIGNATORS DESCRIPTION MANUFACTURER MFG. PART NUMBER CAP, CERM, 1 µF, 25 V, +/- 10%, X7R,...
  • Page 7: Drv425Evm Schematic

    Schematic and Bill of Materials www.ti.com Figure 6. DRV425EVM Schematic SLOU410B – September 2015 – Revised April 2020 DRV425 Evaluation Module Submit Documentation Feedback Copyright © 2015–2020, Texas Instruments Incorporated...
  • Page 8 Equation 1 ......• Added text "To increase the sensitivity, R1 can be adjusted based on Equation 1." in Section 4.2 Revision History SLOU410B – September 2015 – Revised April 2020 Submit Documentation Feedback Copyright © 2015–2020, Texas Instruments Incorporated...
  • Page 9 STANDARD TERMS FOR EVALUATION MODULES Delivery: TI delivers TI evaluation boards, kits, or modules, including any accompanying demonstration software, components, and/or documentation which may be provided together or separately (collectively, an “EVM” or “EVMs”) to the User (“User”) in accordance with the terms set forth herein.
  • Page 10 www.ti.com Regulatory Notices: 3.1 United States 3.1.1 Notice applicable to EVMs not FCC-Approved: FCC NOTICE: This kit is designed to allow product developers to evaluate electronic components, circuitry, or software associated with the kit to determine whether to incorporate such items in a finished product and software developers to write software applications for use with the end product.
  • Page 11 www.ti.com Concernant les EVMs avec antennes détachables Conformément à la réglementation d'Industrie Canada, le présent émetteur radio peut fonctionner avec une antenne d'un type et d'un gain maximal (ou inférieur) approuvé pour l'émetteur par Industrie Canada. Dans le but de réduire les risques de brouillage radioélectrique à...
  • Page 12 www.ti.com EVM Use Restrictions and Warnings: 4.1 EVMS ARE NOT FOR USE IN FUNCTIONAL SAFETY AND/OR SAFETY CRITICAL EVALUATIONS, INCLUDING BUT NOT LIMITED TO EVALUATIONS OF LIFE SUPPORT APPLICATIONS. 4.2 User must read and apply the user guide and other available documentation provided by TI regarding the EVM prior to handling or using the EVM, including without limitation any warning or restriction notices.
  • Page 13 Notwithstanding the foregoing, any judgment may be enforced in any United States or foreign court, and TI may seek injunctive relief in any United States or foreign court. Mailing Address: Texas Instruments, Post Office Box 655303, Dallas, Texas 75265 Copyright © 2019, Texas Instruments Incorporated...
  • Page 14 TI products. TI’s provision of these resources does not expand or otherwise alter TI’s applicable warranties or warranty disclaimers for TI products. Mailing Address: Texas Instruments, Post Office Box 655303, Dallas, Texas 75265 Copyright © 2020, Texas Instruments Incorporated...

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