SLYS016A June   2020  – October 2020 TMAG5124

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Revision History
  6. 5 Device Comparison Table
  7. 6 Pin Configuration and Functions
  8. 7 Specifications
    1. 7.1 Absolute Maximum Ratings
    2. 7.2 ESD Ratings
    3. 7.3 Recommended Operating Conditions
    4. 7.4 Thermal Information
    5. 7.5 Electrical Characteristics
    6. 7.6 Magnetic Characteristics
    7. 7.7 Typical Characteristics
      1. 7.7.1 TMAG5124A and TMAG5124E
      2. 7.7.2 TMAG5124B and TMAG5124F
      3. 7.7.3 TMAG5124C and TMAG5124G
      4. 7.7.4 TMAG5124D and TMAG5124H
      5. 7.7.5 Current Output Level
        1. 7.7.5.1 Low-Level Current Output for TMAG5124A/B/C/D
        2. 7.7.5.2 Low-Level Current Output for TMAG5124E/F/G/H
        3. 7.7.5.3 High-Level Current Output for Every Version
  9. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1 Field Direction Definition
      2. 8.3.2 Device Output
      3. 8.3.3 Protection Circuits
        1. 8.3.3.1 Load Dump Protection
        2. 8.3.3.2 Reverse Polarity Protection
      4. 8.3.4 Power-On Time
      5. 8.3.5 Hall Element Location
      6. 8.3.6 Propagation Delay
      7. 8.3.7 Chopper Stabilization
    4. 8.4 Device Functional Modes
  10. 9 Application and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Applications
      1. 9.2.1 High-Side and Low-Side Typical Application Diagrams
        1. 9.2.1.1 Design Requirements
        2. 9.2.1.2 Detailed Design Procedure
        3. 9.2.1.3 Application Curve
  11. 10Power Supply Recommendations
    1. 10.1 Power Derating
  12. 11Layout
    1. 11.1 Layout Guidelines
    2. 11.2 Layout Example
  13. 12Device and Documentation Support
    1. 12.1 Documentation Support
    2. 12.2 Receiving Notification of Documentation Updates
    3. 12.3 Support Resources
    4. 12.4 Trademarks
    5. 12.5 Electrostatic Discharge Caution
    6. 12.6 Glossary
  14. 13Mechanical, Packaging, and Orderable Information

Package Options

Mechanical Data (Package|Pins)
Thermal pad, mechanical data (Package|Pins)
Orderable Information

8.3.7 Chopper Stabilization

The Basic Hall-effect sensor consists of four terminals where a current is injected through two opposite terminals and a voltage is measured through the other opposite terminals. The voltage measured is proportional to the current injected and the magnetic field measured. By knowing the current inject, the device can then know the magnetic field strength. The problem is that the voltage generated is small in amplitude while the offset voltage generated is more significant. To create a precise sensor, the offset voltage must be minimized.

Chopper stabilization is one way to significantly minimize this offset. It is achieved by "spinning" the sensor and sequentially applying the bias current and measuring the voltage for each pair of terminals. This means that a measurement is completed once the spinning cycle is completed. The full cycle is completed after four measurements. The output of the sensor is connected to an amplifier and an integrator that will accumulate and filter out a voltage proportional to the magnetic field present. Finally, a comparator will switch the output if the voltage reaches either the BOP or BRP threshold (depending on which state the output voltage was previously in).

The frequency of each individual measurement is referred as the Chopping frequency, or fCHOP. The total conversion time is referred as the Propagation delay time, tPD, and is basically equal to 4/fCHOP. Finally, the Signal bandwidth, fBW, represents the maximum value of the magnetic field frequency, and is equal to (fCHOP/4)/2 as defined by the sampling theorem.