SLYS053C November   2023  – May 2025 TMAG3001

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  Temperature Sensor
    7. 5.7  Magnetic Characteristics For A1
    8. 5.8  Magnetic Characteristics For A2
    9. 5.9  Magnetic Temp Compensation Characteristics
    10. 5.10 I2C Interface Timing
    11. 5.11 Power up Timing
    12. 5.12 Timing Diagram
    13. 5.13 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 Sensor Location
      3. 6.3.3 Interrupt Function
      4. 6.3.4 Wake on Change
      5. 6.3.5 Device I2C Address
      6. 6.3.6 Magnetic Range Selection
      7. 6.3.7 Update Rate Settings
    4. 6.4 Device Functional Modes
      1. 6.4.1 Standby (Trigger) Mode
      2. 6.4.2 Sleep Mode
      3. 6.4.3 Wake-Up and Sleep (W&S) Mode
      4. 6.4.4 Continuous Measure Mode
    5. 6.5 Programming
      1. 6.5.1 I2C Interface
        1. 6.5.1.1 Conversion Trigger
        2. 6.5.1.2 Bus Transactions
          1. 6.5.1.2.1 Three Channels I2C Write
          2. 6.5.1.2.2 General Call Write
          3. 6.5.1.2.3 Standard I2C Read
          4. 6.5.1.2.4 I2C Read Command for 16-Bit Data
          5. 6.5.1.2.5 I2C Read Command for 8-Bit Data
          6. 6.5.1.2.6 I2C Read CRC
      2. 6.5.2 Data Definition
        1. 6.5.2.1 Magnetic Sensor Data
        2. 6.5.2.2 Temperature Sensor Data
        3. 6.5.2.3 Magnetic Sensor Gain Correction
        4. 6.5.2.4 Magnetic Sensor Offset Correction
        5. 6.5.2.5 Angle and Magnitude Data Definition
        6. 6.5.2.6 Angle Offset Correction
  8. 7 Register Maps
    1. 7.1 TMAG3001 Registers
  9. 8 Application and Implementation
    1. 8.1 Application Information
      1. 8.1.1 Select 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 Magnetic Limit Check
      5. 8.1.5 Magnitude Limit Check
      6. 8.1.6 Angle Limit Check
      7. 8.1.7 Switch Mode
        1. 8.1.7.1 Unipolar Switch Mode
        2. 8.1.7.2 Omnipolar Switch Mode
        3. 8.1.7.3 Tamper Detection
        4. 8.1.7.4 Angle Switch
        5. 8.1.7.5 Magnitude Switch (Button Press Detection)
      8. 8.1.8 Error Calculation During Linear Measurement
      9. 8.1.9 Error Calculation During Angular Measurement
    2. 8.2 Typical Application
      1. 8.2.1 Angle Measurement
        1. 8.2.1.1 Design Requirements
        2. 8.2.1.2 Detailed Design Procedure
          1. 8.2.1.2.1 Gain Adjustment for Angle Measurement
        3. 8.2.1.3 Application Curves
    3. 8.3 Best Design Practices
    4. 8.4 Power Supply Recommendations
    5. 8.5 Layout
      1. 8.5.1 Layout Guidelines
      2. 8.5.2 Layout Example
  10. 9 Device and Documentation Support
    1. 9.1 Documentation Support
      1. 9.1.1 Related Documentation
    2. 9.2 Receiving Notification of Documentation Updates
    3. 9.3 Support Resources
    4. 9.4 Trademarks
    5. 9.5 Electrostatic Discharge Caution
    6. 9.6 Glossary
  11. 10Revision History
  12. 11Mechanical, Packaging, and Orderable Information
6.5.1.2.6 I2C Read CRC

The TMAG3001 supports optional CRC during I2C read. The CRC can be enabled through the CRC_EN register bit. The CRC is performed on a data string that is determined by the I2C read type. The CRC information is sent as a single byte after the data bytes. The code is generated by the polynomial x8 + x2 + x + 1. Initial CRC bits are FFh. When there are multiple devices on the I2C bus, the first CRC may be incorrect when communicating with the TMAG3001.

The following equations can be employed to calculate CRC:

Equation 1. d = Data Input, c = Initial CRC (FFh)
Equation 2. newcrc[0] = d[7] ^ d[6] ^ d[0] ^ c[0] ^ c[6] ^ c[7]
Equation 3. newcrc[1] = d[6] ^ d[1] ^ d[0] ^ c[0] ^ c[1] ^ c[6]
Equation 4. newcrc[2] = d[6] ^ d[2] ^ d[1] ^ d[0] ^ c[0] ^ c[1] ^ c[2] ^ c[6]
Equation 5. newcrc[3] = d[7] ^ d[3] ^ d[2] ^ d[1] ^ c[1] ^ c[2] ^ c[3] ^ c[7]
Equation 6. newcrc[4] = d[4] ^ d[3] ^ d[2] ^ c[2] ^ c[3] ^ c[4]
Equation 7. newcrc[5] = d[5] ^ d[4] ^ d[3] ^ c[3] ^ c[4] ^ c[5]
Equation 8. newcrc[6] = d[6] ^ d[5] ^ d[4] ^ c[4] ^ c[5] ^ c[6]
Equation 9. newcrc[7] = d[7] ^ d[6] ^ d[5] ^ c[5] ^ c[6] ^ c[7]

The following examples show calculated CRC byte based off various input data:

I2C Data 00h : CRC = F3h

I2C Data FFh : CRC = 00h

I2C Data 80h : CRC = 7Ah

I2C Data 4Ch : CRC = 10h

I2C Data E0h : CRC = 5Dh

I2C Data 00000000h : CRC = D1h

I2C Data FFFFFFFFh : CRC = 0Fh