SLYS037A March   2023  – March 2024 TMAG6180-Q1

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Pin Configuration and Functions
  6. 5 Specifications
    1. 5.1 Absolute Maximum Ratings
    2. 5.2 ESD Ratings
    3. 5.3 Recommended Operating Conditions
    4. 5.4 Thermal Information
    5. 5.5 Electrical Characteristics
    6. 5.6 Magnetic Characteristics
    7. 5.7 Typical Characteristics
  7. 6 Detailed Description
    1. 6.1 Overview
    2. 6.2 Functional Block Diagram
    3. 6.3 Feature Description
      1. 6.3.1 Magnetic Flux Direction
      2. 6.3.2 Sensors Location and Placement Tolerances
      3. 6.3.3 Magnetic Response
      4. 6.3.4 Parameters Definition
        1. 6.3.4.1 AMR Output Parameters
        2. 6.3.4.2 Transient Parameters
          1. 6.3.4.2.1 Power-On Time
        3. 6.3.4.3 Angle Accuracy Parameters
        4. 6.3.4.4 Hall Sensor Parameters
      5. 6.3.5 Automatic Gain Control (AGC)
      6. 6.3.6 Safety and Diagnostics
        1. 6.3.6.1 Device Level Checks
        2. 6.3.6.2 System Level Checks
    4. 6.4 Device Functional Modes
      1. 6.4.1 Operating Modes
        1. 6.4.1.1 Active Mode
        2. 6.4.1.2 Fault Mode
  8. 7 Application and Implementation
    1. 7.1 Application Information
      1. 7.1.1 Power Supply as the Reference for External ADC
      2. 7.1.2 AMR Output Dependence on Airgap Distance
      3. 7.1.3 Calibration of Sensor Errors
    2. 7.2 Typical Application
      1. 7.2.1 Design Requirements
      2. 7.2.2 Detailed Design Procedure
        1. 7.2.2.1 Extending the Angle Range to 360 Degrees
      3. 7.2.3 Application Curves
    3. 7.3 Power Supply Recommendations
    4. 7.4 Layout
      1. 7.4.1 Layout Guidelines
      2. 7.4.2 Layout Example
  9. 8 Device and Documentation Support
    1. 8.1 Receiving Notification of Documentation Updates
    2. 8.2 Support Resources
    3. 8.3 Trademarks
    4. 8.4 Electrostatic Discharge Caution
    5. 8.5 Glossary
  10. 9 Revision History
  11. 10Mechanical, Packaging, and Orderable Information

Package Options

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

6.3.5 Automatic Gain Control (AGC)

The TMAG6180-Q1 features an automatic gain control circuitry to reduce the drift of the AMR sensor outputs across temperature. The device changes the gain of the output drivers to keep the final output within an appropriate voltage range on SIN_P, SIN_N, COS_P and COS_N. The AGC block uses the square root of the sum of the squared amplitudes of the two channels to sense amplitude of output signals and set gain selection. The AGC block sets the gain for sine and cosine channels, meaning that the peak-to-peak amplitude of single-ended voltages, VOUT is within the range listed in Specifications. The AGC block changes the gain of both the sine and cosine channels simultaneously.

If the outputs are out of the normal operating range, the AGC block changes the gain of the sine and cosine channels by a step size of ±1% VCC at an interval of tagc_update, typically around 1 second, as defined in Specifications. Figure 6-11 shows the differential AMR outputs for a continuously rotating input field. The shaded area represents the No AGC Control band that represents ±5% of VCC and is centered at 60% of VCC. Notice that the AGC loop reduces the gain and updates the amplitude at a step size of 1% VCC as the sine and cosine signals drift outside of the shaded region. If the outputs remain within the shaded region, then no action is taken by the AGC control loop.

GUID-5CDE9FF9-2959-4357-8778-DE87D61CEA7D-low.svg Figure 6-11 Timing Diagram Showing the Operation of Automatic Gain Control