JAJSNP8B March   2023  – August 2024 TMAG6181-Q1

PRODUCTION DATA  

  1.   1
  2. 1 特長
  3. 2 アプリケーション
  4. 3 概要
  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 Hall Sensor Parameters
        4. 6.3.4.4 Angle Accuracy Parameters
      5. 6.3.5 Automatic Gain Control (AGC)
      6. 6.3.6 Turns Counter
        1. 6.3.6.1 Rotation Tracking
      7. 6.3.7 Safety and Diagnostics
        1. 6.3.7.1 Device Level Checks
        2. 6.3.7.2 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 Active-Turns Mode
        3. 6.4.1.3 Low-Power Mode
        4. 6.4.1.4 Sleep Mode
        5. 6.4.1.5 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 Designing with Multiple Sensors
          1. 7.2.2.1.1 Designing for Redundancy
          2. 7.2.2.1.2 Multiplexing Multiple Sensors
      3. 7.2.3 Application Curve
    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 ドキュメントの更新通知を受け取る方法
    2. 8.2 サポート・リソース
    3. 8.3 Trademarks
    4. 8.4 静電気放電に関する注意事項
    5. 8.5 用語集
  10. 9 Revision History
  11. 10Mechanical, Packaging, and Orderable Information

パッケージ・オプション

メカニカル・データ（パッケージ｜ピン）
サーマルパッド・メカニカル・データ
発注情報

6.3.4.1 AMR Output Parameters

Magnetic Response shows the single-ended output signals as SIN_P, SIN_N, COS_P and COS_N. These signals are ratiometric to the supply voltage (VCC). The common-mode voltage (VCM) of the individual signals is half of the supply voltage (VCC /2). For single-ended signals, VOUT is defined as the difference between the maximum and minimum output voltage for a rotating magnetic field. Use Equation 2 to calculate VOUT_SIN_P.

Equation 2. V O U T _ S I N _ P = V S I N _ P ( m a x ) – V S I N _ P ( m i n )

where

  • VSIN_P (max) is the maximum output voltage across the full magnetic angle range
  • VSIN_P (min) is minimum output voltage across the full magnetic angle range

Typically, VOUT is around 60% of the supply voltage (VCC). The diagnostic band indicates that the output signals are outside normal operating range and indicates a presence of fault.

TMAG6181-Q1 AMR Differential-Ended Output Signals Figure 6-7 AMR Differential-Ended Output Signals

Figure 6-7 shows the differential sine and cosine output signals generated from the corresponding sine and cosine single-ended outputs. Use Equation 3 and Equation 4 to calculate the differential voltages.

Equation 3. V s i n _ d i f f = V S I N _ P – V S I N _ N
Equation 4. V c o s _ d i f f = V C O S _ P – V C O S _ N

The offset of the differential signals is the average of the maximum and minimum voltages of the sine or cosine signals. Use Equation 5 and Equation 6 to calculate the offsets for the sine and cosine signals.

Equation 5. V o f f s e t _ s i n = V s i n _ d i f f ( m a x )   +   V s i n _ d i f f ( m i n )   2  
Equation 6. V o f f s e t _ c o s = V c o s _ d i f f ( m a x )   +   V c o s _ d i f f ( m i n )   2

For single-ended signals, the offset is the common-mode voltage (VCM).

Use Equation 7 to calculate the differential offset for sine and cosine channels at any given temperature, TA

Equation 7. V o f f s e t = V o f f s e t ,   r o o m + V o f f s e t _ T C × T A – 25 ° C

where

  • VOffset_TC is the temperature drift coefficient of the offset
  • VOffset_room is the room temperature offset

Use Equation 8 and Equation 9 to calculate the amplitudes of the differential signals.

Equation 8. A s i n _ d i f f = V s i n _ d i f f ( m a x )   –   V s i n _ d i f f ( m i n )   2
Equation 9. A c o s _ d i f f = V c o s _ d i f f ( m a x )   –   V c o s _ d i f f ( m i n )   2

Use Equation 10 to calculate the amplitude for single-ended signals.

Equation 10. A s i n _ p = V s i n _ p ( m a x )   –   V s i n _ p ( m i n )   2

Amplitude asynchronism refers to the amplitude mismatch error between sine and cosine channels. Use Equation 11 to calculate the amplitude mismatch error.

Equation 11. k = 1 –   ( A c o s _ d i f f   A s i n _ d i f f )

The sine and cosine output signals are typically out-of-phase by 90 degrees, but if an internal phase error occurs owing to sensor and other on chip circuitry non-idealities, the sine and cosine outputs from the sensor can be different than the ideal 90 degrees. This error is referred to as the orthogonality error. This error is defined as the angle error between the zero crossing of the cosine output and maximum value of the sine outputs.

The hysteresis error (ANGhyst) refers to the largest angle error difference between a clockwise rotation and a counter-clockwise rotation.

For the AMR sensor, the orthogonality error and the hysteresis errors are negligible.