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User's Guide
SLOU410A–September 2015–Revised October 2015
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.
Contents
1 Features....................................................................................................................... 1
2 Introduction ................................................................................................................... 1
3 Magnetic Field Interface .................................................................................................... 2
3.1 Power Supply........................................................................................................ 2
3.2 Reference Voltages................................................................................................. 2
3.3 Output Voltage ...................................................................................................... 3
4 EVM Operation............................................................................................................... 4
4.1 Error and Over Range.............................................................................................. 4
4.2 Calculation of Magnetic Field Strength .......................................................................... 4
5 Schematic and Bill of Materials ............................................................................................ 6
List of Figures
1 Magnetic Field Axis of Sensitivity.......................................................................................... 2
2 Board Modification for External Reference............................................................................... 3
3 Output Voltage vs. Magnetic Field Strength.............................................................................. 5
4 Error vs. Magnetic Field Strength.......................................................................................... 5
5 DRV425EVM Top Side Layout............................................................................................. 6
6 DRV425EVM Schematic.................................................................................................... 7
List of Tables
1 Internal Reference Options................................................................................................. 2
2 Factory Configuration Defaults............................................................................................. 4
3 Bill of Materials............................................................................................................... 6
1 Features
• Full-featured Evaluation Board for the DRV425
• Allows for the use of various user supplied compensation coils
• On board or external reference option
2 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.
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SLOU410A–September 2015–Revised October 2015 DRV425 Evaluation Module
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