Texas Instruments DRV425 User Manual
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Texas Instruments DRV425 User Manual

Texas Instruments DRV425 User Manual

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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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Features
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Full-featured Evaluation Board for the DRV425
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Allows for the use of various user supplied compensation coils
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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.
All trademarks are the property of their respective owners.
SLOU410A - September 2015 - Revised October 2015
Submit Documentation Feedback
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Copyright © 2015, Texas Instruments Incorporated
SLOU410A - September 2015 - Revised October 2015
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List of Figures
List of Tables
User's Guide
DRV425 Evaluation Module
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Summary of Contents for Texas Instruments DRV425

  • 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

    Magnetic Field Interface www.ti.com Magnetic Field Interface The DRV425 device contains and integrated fluxgate sensor which is located between pins 2 and 14. The magnetic field sensitivity is parallel to the surface of the chip. 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.

  • Page 3: Output Voltage

    An external reference can be applied to J1 pin 1, referenced to pin 3. If an external reference is used, it is important to keep it at a level of VDD/2, which is the common mode point of the differential amplifier output stage of the 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

    4 x 12.2 x R1 shunt The maximum magnetic field range of the DRV425 is ±2 mT. With the 100 Ω shunt located at R1, the maximum field measurement range is ±500 µT.To increase the sensitivity, R1 can be adjusted based on Equation 1.

  • 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 SLOU410A – September 2015 – Revised October 2015 DRV425 Evaluation Module Submit Documentation Feedback Copyright © 2015, Texas Instruments Incorporated...

  • Page 6: Calculation Of Magnetic Field Strength 5 Schematic And Bill Of Materials

    R8 do not have any physical silkscreen on the printed circuit board, they are highlights below for clarity. Figure 5. DRV425EVM Top Side Layout DRV425 Evaluation Module SLOU410A – September 2015 – Revised October 2015 Submit Documentation Feedback Copyright © 2015, Texas Instruments Incorporated...

  • Page 7: Drv425Evm Schematic

    Schematic and Bill of Materials www.ti.com Figure 6. DRV425EVM Schematic SLOU410A – September 2015 – Revised October 2015 DRV425 Evaluation Module Submit Documentation Feedback Copyright © 2015, Texas Instruments Incorporated...
  • Page 8 Added text "To increase the sensitivity, R1 can be adjusted based on Equation 1." in Section 4.2 NOTE: Page numbers for previous revisions may differ from page numbers in the current version. Revision History SLOU410A – September 2015 – Revised October 2015 Submit Documentation Feedback Copyright © 2015, Texas Instruments Incorporated...
  • Page 9 STANDARD TERMS AND CONDITIONS FOR EVALUATION MODULES Delivery: TI delivers TI evaluation boards, kits, or modules, including any accompanying demonstration software, components, or documentation (collectively, an “EVM” or “EVMs”) to the User (“User”) in accordance with the terms and conditions set forth herein. Acceptance of the EVM is expressly subject to the following terms and conditions.
  • Page 10 FCC Interference Statement for Class B EVM devices NOTE: This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation.
  • Page 11 【無線電波を送信する製品の開発キットをお使いになる際の注意事項】 開発キットの中には技術基準適合証明を受けて いないものがあります。 技術適合証明を受けていないもののご使用に際しては、電波法遵守のため、以下のいずれかの 措置を取っていただく必要がありますのでご注意ください。 1. 電波法施行規則第6条第1項第1号に基づく平成18年3月28日総務省告示第173号で定められた電波暗室等の試験設備でご使用 いただく。 2. 実験局の免許を取得後ご使用いただく。 3. 技術基準適合証明を取得後ご使用いただく。 なお、本製品は、上記の「ご使用にあたっての注意」を譲渡先、移転先に通知しない限り、譲渡、移転できないものとします。 上記を遵守頂けない場合は、電波法の罰則が適用される可能性があることをご留意ください。 日本テキサス・イ ンスツルメンツ株式会社 東京都新宿区西新宿６丁目２４番１号 西新宿三井ビル 3.3.3 Notice for EVMs for Power Line Communication: Please see http://www.tij.co.jp/lsds/ti_ja/general/eStore/notice_02.page 電力線搬送波通信についての開発キットをお使いになる際の注意事項については、次のところをご覧くださ い。http://www.tij.co.jp/lsds/ti_ja/general/eStore/notice_02.page SPACER 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.
  • Page 12 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 © 2015, Texas Instruments Incorporated...
  • Page 13 IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, enhancements, improvements and other changes to its semiconductor products and services per JESD46, latest issue, and to discontinue any product or service per JESD48, latest issue.
  • Page 14 Mouser Electronics Authorized Distributor Click to View Pricing, Inventory, Delivery & Lifecycle Information: Texas Instruments DRV425EVM...

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