ADMT4000

RECOMMENDED FOR NEW DESIGNS

True Power-On Multiturn Sensor

Data Sheet (Rev. A) Product Selection Table
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Overview

  • True Power-On multiturn counter
  • 46-turn magnetic sensor
  • >16k° digital output
  • ±0.25° accuracy
  • Measurement update rate 100 kSPS
  • 16 mT to 31 mT operating range
  • Internal temperature sensor
  • IC supply, 3.3 V
  • SPI interface, 1.8 V to 5 V
  • Junction temperature range: -40°C to +150°C
  • 24-pin TSSOP
  • Industrial applications

The ADMT4000 is a magnetic turn count sensor capable of recording the number of rotations of a magnetic system even while the device is powered down. On power up the device can be interrogated to report the absolute position of the system. The absolute position is reported through a serial-peripheral interface (SPI). The ADMT4000 counts up to 46 turns of an external magnetic field, incrementing the absolute position in the clockwise (CW) direction.

The device includes three magnetic sensors, a giant magneto resistance (GMR) turn count sensor, which is used to count the number of rotations on the system, a GMR quadrant detecting sensor, and an anisotropic magnetoresistive (AMR) angle sensor. The AMR angle sensor is used in combination with a GMR quadrant detecting sensor to determine the absolute position of the system within 360°. Combining the GMR turn count sensor output with the AMR angle sensor output enables the device to report the position of the system with a high degree of angular accuracy.

PRODUCT HIGHLIGHTS

  • True Power-On multiturn counter
  • Angle sensor with ±0.25°
  • SPI interface
  • Under and over voltage detection

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    ADMT4000
    True Power-On Multiturn Sensor
    ADMT4000 Functional Block Diagram ADMT4000 Pin Configuration
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    Documentation

    Data Sheet 1

    User Guide 3

    Application Note 1

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    Software Resources

    Evaluation Software 1

    ADMT4000DRV-SRC Software

     

    Hardware Ecosystem

    Parts Product Life Cycle Description
    Switching Regulators & Controllers 2
    LT3461A
    		PRODUCTION 3MHz Step-Up DC/DC Converters with Integrated Schottky in ThinSOT
    LT3467
    		PRODUCTION 1.1A Step-Up DC/DC Converter with Integrated Soft-Start
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    Tools & Simulations

    Design Tool 1

    Evaluation Kits

    eval board
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    ADMAG3476

    ADMT4000 Magnet and Stray Magnetic Field Shield

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    Features and Benefits

    • Magnet Assembly with an Integrated Stray Magnetic Field Shield
    • Optional PCB-Mounted Stray Magnetic Field Shield
    • Magnetic Stray Field Shielding Effectiveness at 5mT
      • ADMAGB3476 and ADMAGMECH04 ≈ 88 %
      • ADMAGB3476 Only ≈ 59 %
    • Low Angular Hysteresis
    • 16mT to 31mT Operating Range
    • −40°C to +125°C Temperature Range
    • Industrial and Automotive Applications

    Recommended magnet supplier is Max Baermann GmbH.
    Max Baermann GmbH - Magnetherstellung in höchster Präzision

    Product Details

    The ADMAGB3476 and ADMAGMECH04 provide a robust solution for maintaining magnetic window requirements of the ADMT4000. The integrated shielding provides protection against stray magnetic fields, which is crucial for accurate measurements. The integrated magnet shield rotates with the magnet to result in low angular hysteresis. Manufactured from samarium cobalt (SmCo), the magnet maintains the magnetic operating window of the ADMT4000 over the entire temperature range.

    APPLICATIONS

    • ADMT4000 Multiturn Absolute Position Sensing without Power
    • Contactless Position Measurement
    • Brushless DC Motor Control and Positioning
    • Actuator Control and Positioning

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    EVAL-ADMT4000

    Evaluating the ADMT4000 Zero Power Multiturn Sensor

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    Features and Benefits

    Product Details

    The ADMT4000 is a magnetic turn, counter sensor capable of recording turns of an external magnetic field with zero power. The absolute position, including the number of turns, is reported via a serial peripheral interface (SPI). The EVAL-ADMT4000SD1Z evaluation board allows for the evaluation of the ADMT4000 zero power, multiturn sensor by providing a flexible hardware platform with accompanying graphical user interface (GUI). The EVAL-ADMT4000SD1Z features the ADMT4000 in an end of shaft magnet configuration, Figure 1. The evaluation kit is composed of an EVAL-ADMT4000SD1Z and a magnetic stimulus on a printed circuit board (PCB) mount. To operate with the provided GUI, the EVAL-SDP-CS1Z (SDP-S) or EVAL-SDP-CB1Z (SDP-B) is required, interchangeably referred to as the SDP controller board within this user guide.

    The EVAL-ADMT4000SD1Z allows a detailed evaluation of the ADMT4000. The GUI demonstrates turn count, angular measurement, diagnostic measurements, system-level calibration, and device configuration. The EVAL-ADMT4000SD1Z is fitted with a coil to enable magnetic reset of the turn-count sensor. Time stamped captured data can be logged to a technical data management streaming (TDMS) file. The TDMS file format allows large data sets to be stored and indexed. Data logs contain the device settings in addition to time stamped data and fault status. The calibration function allows the user to store the detailed results of the calibration using data captured using the GUI or data captured using the measurement system of the user.

    The EVAL-ADMT4000SD1Z also provides 2.54 mm headers for power and digital signals that allow the user to evaluate the EVALADMT4000SD1Z with an external microcontroller platform and start the system software development. The PCB is designed so that the sensor board can be broken off of the SDP interface section to provide a smaller form factor. Power supplies can be sourced from either the USB port via the SDP controller board, or an external bench supply.

    For full details of the EVAL-ADMT4000SD1Z, see the ADMT4000 data sheet, which must be consulted in conjunction with this user guide, when using the EVAL-ADMT4000SD1Z evaluation board.
    ADMAG3476
    ADMT4000 Magnet and Stray Magnetic Field Shield
    ADMAG3476 Evaluation Board Photo ADMAG3476 Evaluation Board Photo ADMAG3476 Evaluation Board Photo ADMAG3476 Evaluation Board Photo ADMAG3476 Evaluation Board Photo ADMAG3476 Evaluation Board Photo ADMAG3476 Evaluation Board Photo
    EVAL-ADMT4000
    Evaluating the ADMT4000 Zero Power Multiturn Sensor
    EV-ADMT4000SDZ Evaluation Board EV-ADMT4000SDZ Evaluation Board - Top View EV-ADMT4000SDZ Evaluation Board - Bottom View

    Reference Designs
    CN0602
    ADMT4000 TSSOP Industrial Reference Design
    Figure 1. Circuit Diagram Illustrating the Use of a Pulse Generator and Coil for GMR Sensor Magnetic Reset

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