ZHCSQR5A March 2023 – March 2024 TMAG6180-Q1
PRODUCTION DATA
- 1
- 1 特性
- 2 应用
- 3 说明
- 4 Pin Configuration and Functions
- 5 Specifications
- 6 Detailed Description
- 7 Application and Implementation
- 8 Device and Documentation Support
- 9 Revision History
- 10Mechanical, Packaging, and Orderable Information
6.3.3 Magnetic Response
The AMR sensor has two components that are sensitive to the in-plane magnetic field X and Y axes parallel to the chip surface. Section 6.3.3 shows the AMR sensor with the differential sine and cosine outputs SIN_P, SIN_N, COS_P and COS_N. The outputs have an electrical range of 180 degrees. If the mechanical angle between the sensor reference and the direction of the magnetic field is θ, then the AMR outputs correspond to cosine 2θ and sine 2θ respectively. For every 360° rotation of the external magnetic field, the AMR outputs provide two periods, at 180° sensing range for each period. Hence, for a dipole magnet rotating at speed of f, the electrical output from the AMR sensor outputs can be at twice the frequency at 2f. Use Equation 1 to calculate the angle of the magnetic field is calculated using an arctangent2 function.
where
- Vsin is the differential sine output
- Vcos is the differential cosine output
The AMR sensor is sensitive only to the direction of the magnetic field and has a wide operating magnetic field range. The voltage levels of the AMR outputs are independent of the absolute flux density as long as the magnetic flux density is above the minimum recommended operating fields.
Figure 6-4 AMR Sensor Outputs Magnetic
ResponseThe two integrated Hall sensors X and Y that are sensitive to the in-plane X and Y axes similar to the AMR sensor. Figure 6-5 shows both the Hall outputs reacting to the input field by going low when the field is higher than operating point (BOP) and going high when the field is lower than returning point (BRP).
Figure 6-5 Hall Sensor Magnetic
ResponseFor a rotating input magnetic field, with the X and Y components of BSIN and BCOS respectively, Figure 6-6 shows the response of the AMR and Hall sensors. The integrated X and Y Hall sensors provide digital outputs (Q0 and Q1, respectively). See the Functional Block Diagram. The Hall sensors have a 360° compared to the 180° angle range of the AMR sensors. By utilizing the digital outputs of the Hall sensors, the angle range of the AMR sensor can be extended to 360°.
