SBASAF4 September   2021 TMAG5170

PRODUCTION DATA  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Pin Configuration and Functions
  6. 6 Specifications
    1. 6.1 Absolute Maximum Ratings
    2. 6.2 ESD Ratings
    3. 6.3 Recommended Operating Conditions
    4. 6.4 Thermal Information
    5. 6.5 Electrical Characteristics
    6. 6.6 Magnetic Characteristics
    7. 6.7 Power up Timing
    8. 6.8 SPI Interface Timing
    9. 6.9 Typical Characteristics
  7. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Magnetic Flux Direction
      2. 7.3.2 Sensor Location
      3. 7.3.3 Magnetic Range Selection
      4. 7.3.4 Update Rate Settings
      5. 7.3.5 ALERT Function
        1. 7.3.5.1 Interrupt and Trigger Mode
        2. 7.3.5.2 Magnetic Switch Mode
      6. 7.3.6 Threshold Count
      7. 7.3.7 Diagnostics
        1. 7.3.7.1  Memory CRC Check
        2. 7.3.7.2  ALERT Integrity Check
        3. 7.3.7.3  VCC Check
        4. 7.3.7.4  Internal LDO Under Voltage Check
        5. 7.3.7.5  Digital Core Power-on Reset Check
        6. 7.3.7.6  SDO Output Check
        7. 7.3.7.7  Communication CRC Check
        8. 7.3.7.8  Oscillator Integrity Check
        9. 7.3.7.9  Magnetic Field Threshold Check
        10. 7.3.7.10 Temperature Alert Check
        11. 7.3.7.11 Analog Front-End (AFE) Check
        12. 7.3.7.12 Hall Resistance and Switch Matrix Check
        13. 7.3.7.13 Hall Offset Check
        14. 7.3.7.14 ADC Check
    4. 7.4 Device Functional Modes
      1. 7.4.1 Operating Modes
        1. 7.4.1.1 Active Mode
        2. 7.4.1.2 Standby Mode
        3. 7.4.1.3 Configuration Mode (DEFAULT)
        4. 7.4.1.4 Sleep Mode
        5. 7.4.1.5 Wake-Up and Sleep Mode
        6. 7.4.1.6 Deep-Sleep Mode
    5. 7.5 Programming
      1. 7.5.1 Data Definition
        1. 7.5.1.1 Magnetic Sensor Data
        2. 7.5.1.2 Temperature Sensor Data
        3. 7.5.1.3 Magnetic Sensor Offset Correction
        4. 7.5.1.4 Angle and Magnitude Data Definition
      2. 7.5.2 SPI Interface
        1. 7.5.2.1 SCK
        2. 7.5.2.2 CS
        3. 7.5.2.3 SDI
        4. 7.5.2.4 SDO
          1. 7.5.2.4.1 Regular 32-Bit SDO Read
          2. 7.5.2.4.2 Special 32-Bit SDO Read
        5. 7.5.2.5 SPI CRC
        6. 7.5.2.6 SPI Frame
          1. 7.5.2.6.1 32-Bit Read Frame
          2. 7.5.2.6.2 32-Bit Write Frame
    6. 7.6 Register Map
      1. 7.6.1 TMAG5170 Registers
  8. 8 Application and Implementation
    1. 8.1 Application Information
      1. 8.1.1 Selecting the Sensitivity Option
      2. 8.1.2 Temperature Compensation for Magnets
      3. 8.1.3 Sensor Conversion
        1. 8.1.3.1 Continuous Conversion
        2. 8.1.3.2 Trigger Conversion
        3. 8.1.3.3 Pseudo-Simultaneous Sampling
      4. 8.1.4 Error Calculation During Linear Measurement
      5. 8.1.5 Error Calculation During Angular Measurement
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
        1. 8.2.1.1 Gain Adjustment for Angle Measurement
      2. 8.2.2 Detailed Design Procedure
      3. 8.2.3 Application Curves
    3. 8.3 Do's and Don'ts
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
  11. 11Device and Documentation Support
    1. 11.1 Receiving Notification of Documentation Updates
    2. 11.2 Support Resources
    3. 11.3 Trademarks
    4. 11.4 Electrostatic Discharge Caution
    5. 11.5 Glossary
  12. 12Mechanical, Packaging, and Orderable Information

Package Options

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

7.5.1.4 Angle and Magnitude Data Definition

The TMAG5170 calculates the angle based off the ANGLE_EN register bit settings. Figure 7-8 shows that the ANGLE_RESULT register stores the angle information in the 13-LSB bits. Bits D04-D12 store angle integer value from 0 to 360 degree. Bits D00-D03 store fractional angle value with a resolution of 1/16 degree. The 3-MSB bits are always populated as b000. The TMAG5170 CORDIC offers angle resolution of 1/4 degree. An external CORDIC may be used if higher angle resolution is required. Use Equation 7 to calculate the angle.

Equation 7. A =   ∑ i = 4 12 D i × 2 i - 4 + ∑ i = 0 3 D i × 2 i 16

where

  • A is the angle measured in degree.
  • Di is the data bit as shown in Figure 7-8.

For example: a 354.50 degree is populated as 0001 0110 0010 1000b and a 17.25 degree is populated as 0000 0001 0001 0100b.

With DATA_TYPE ≠ 00b, the D01-D12 bits from the ANGLE_RESULT register can be accessed. In this mode, the angle fractional value is represented by 3 bit with resolution of 1/8 degree. Use Equation 8 to calculate the angle in degree.

Equation 8. A =   ∑ i = 4 12 D i × 2 i - 4 + ∑ i = 1 3 D i × 2 i - 1 8
GUID-C7BDC67F-675A-4B66-A2D8-48B5EEC8F936-low.gifFigure 7-8 Angle Data Definition

During the angle calculation, use Equation 9 to calculate the resultant vector magnitude.

Equation 9. GUID-124B830F-F055-44D3-B9BE-13841C8FBC67-low.gif

where

  • MADCCh1, MADCCh2 are the ADC codes of the two magnetic channels selected for the angle calculation.

Figure 7-9 shows the magnitude value stored in the MAGNITUDE_RESULT register. This value should be constant during 360 degree angle measurements.

GUID-36B4B83C-0123-43FA-B9A1-82286477FED2-low.gifFigure 7-9 Magnitude Result Data Definition

The magnitude result can be accessed through SPI in 16-bit or 12-bit formats. In the 12-bit format, bit D01 to bit D12 are sent through the SPI.