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

8.1.4 Magnetic Limit Check

The TMAG3001 enables magnetic limit checks for single or multiple axes at the same time. The device can be configured to be sensitive for X, Y and Z magnetic axes thresholds when THR_SEL[1:0] is set to 2h.

Table 8-1 Register Configuration for Magnetic Limit Check When THR_SEL[1:0] = 1h
REGISTER NAME REGISTER ALIAS WHEN THR_SEL[1:0] = 1h DESCRIPTION

THR_Config_1

X_THR_LO

Sets the lower threshold limit for X channel
THR_Config_2 Y_THR_LO Sets the lower threshold limit for Y channel
THR_Config_3 Z_THR_LO Sets the lower threshold limit for Z channel
Table 8-2 Register Configuration for Magnetic Limit Check When THR_SEL[1:0] = 2h and Angle_EN[1:0] = 0h
REGISTER NAME REGISTER ALIAS WHEN THR_SEL[1:0] = 2h AND Angle_EN[1:0] = 0h DESCRIPTION
Sensor_Config_4

X_THR_HI

 Sets the upper threshold limit for X channel
Sensor_Config_5 Y_THR_HI Sets the upper threshold limit for Y channel
Sensor_Config_6 Z_THR_HI Sets the upper threshold limit for Z channel

The magnetic higher and lower thresholds are unsigned 7-bit values. x_THR_LO[6:0] and x_THR_HI[6:0] set positive magnetic thresholds while x_THR_LO[7] and x_THR_HI[7] are ignored, resulting in the possible range of threshold entrees of 1 to 128. Both the higher and lower threshold limits can be enabled independently. No threshold comparison is done if the thresholds are set to 0h. The lower threshold for X channel can be calculated using Equation 13.

Equation 13. T h r e s h o l d   ( m T ) = T H R _ C O N F I G _ 1[6:0] × 256 SENS

For example, for the A1 device version, the default magnetic range is ±37mT with a sensitivity of 885 LSB/mT. If X_Y_RANGE=0 and THR_SEL= 10b, for a threshold configuration of 0000111b in THR_CONFIG_1, the X channel lower threshold is given by

Equation 14. X   L o w   T h r e s h o l d   ( m T ) = 7 × 256 885   =   2.025   m T

Figure 8-5 and Figure 8-5 show examples of magnetic limit cross detection events while the field going above, below, exiting a magnetic band, and entering a magnetic band. The device keeps generating an interrupt with each new conversion if the magnetic fields remain in the shaded regions in the figures. The MAG_THR_DIR register bit helps select the out of range regions for threshold crossings. The magnetic limit check can be performed in standby, continuous or wake and sleep operating modes.

TMAG3001 Magnetic Limit Cross Check With MAG_THR_DIR = 0h, THR_SEL[1:0] = 2h, INT_STATE = 1hFigure 8-4 Magnetic Limit Cross Check With MAG_THR_DIR = 0h, THR_SEL[1:0] = 2h, INT_STATE = 1h
TMAG3001 Magnetic Lower Limit Cross Check With MAG_THR_DIR =1b, THR_SEL=10b , INT_STATE=1bFigure 8-5 Magnetic Lower Limit Cross Check With MAG_THR_DIR =1b, THR_SEL=10b , INT_STATE=1b