Magnetic Sensors - Compass, Magnetic Field (Modules)

Part Number	Description / PDF	Quantity
HMR3300 Honeywell Aerospace	MODULE DIG COMPASS UART 3 AXIS	77
HMR2300-D00-232 Honeywell Aerospace	MAGNETOMETER RS232	43
TLE4927CE6547 IR (Infineon Technologies)	TLE4927 - MAGNETIC SPEED SENSOR	99
HMR2300-D21-485 Honeywell Aerospace	MAGNETOMETER RS485 W/CASE	0
PDRV5056A4EDBZTQ1 Texas Instruments	HALL EFFECT SENSOR	1136
TLV4961-3M IR (Infineon Technologies)	TLV4961 - HALL SWITCH	180000
TLE4998P4 IR (Infineon Technologies)	TLE4998 - PROGRAMMABLE LINEAR HA	1790
TLE4953 IR (Infineon Technologies)	HALL EFFECT SENSOR	8018
TLE4998S3C IR (Infineon Technologies)	TLE4998 - PROGRAMMABLE LINEAR HA	19063
TLE4953C IR (Infineon Technologies)	HALL EFFECT SENSOR	0
TLE4941C IR (Infineon Technologies)	HALL EFFECT SENSOR	130
TLE4942-1C IR (Infineon Technologies)	TLE4942 - MAGNETIC SPEED SENSOR	0
HMR2300-D20-485 Honeywell Aerospace	MAGNETOMETER RS485 W/CASE	0
HMR3000-D21-485 Honeywell Aerospace	MODULE DIG COMPASS W/CASE RS485	0
HMR2300-D20-232 Honeywell Aerospace	MAGNETOMETER RS232 W/CASE	0
HMR3200 Honeywell Aerospace	MODULE DIG COMPASS UART 2 AXIS	0
DRM4000-N00-232 Honeywell Aerospace	DRM 4000 MODULE	0
HMR3601 Honeywell Aerospace	COMPASS	0
HMR3500 Honeywell Aerospace	3-AXIS COMPASS MODULE	0
29123 Parallax, Inc.	MODULE COMPASS HITACHI HM55B	0

Magnetic Sensors - Compass, Magnetic Field (Modules)

1. Overview

Magnetic sensors/modules detect and measure magnetic fields, providing critical data for navigation, positioning, and electromagnetic environment monitoring. Compass modules specifically determine directional orientation relative to Earth's magnetic field, while general magnetic field modules quantify field strength and variations. These devices are fundamental in applications ranging from consumer electronics to industrial automation and aerospace systems.

2. Major Types & Functional Classification

Type	Functional Characteristics	Application Examples
Hall Effect Sensors	Measure DC/AC magnetic fields via voltage generation across a conductor	Current sensing, position detection
Anisotropic Magnetoresistive (AMR) Sensors	High sensitivity to weak magnetic fields (<1 T), low power consumption	Electronic compasses, pedestrian navigation
Fluxgate Sensors	High precision for AC fields, excellent stability	Geophysical surveys, submarine detection
Magnetoresistive (GMR/TMR) Sensors	Nano-scale sensitivity (nT levels), wide dynamic range	Hard disk drives, biomedical devices

3. Structure & Components

Typical modules integrate: (1) Sensing element (Hall plate/AMR bridge/GMR multilayers), (2) Signal conditioning ASIC (amplification/filtering), (3) Temperature compensation circuitry, (4) Digital interface (I2C/SPI). Advanced packages incorporate 3-axis sensing and embedded calibration memory. Hermetic sealing with non-magnetic alloys ensures environmental durability.

4. Key Technical Specifications

Parameter	Description	Importance
Field Range	Measurement capability ( 25 T to 100mT)	Determines application suitability
Sensitivity	mV/ T or T/LSB	Resolution for weak field detection
Non-Linearity	Deviation from ideal response (<0.1%)	Accuracy assurance
Operating Temperature	-40 C to +125 C	Environmental reliability
Current Consumption	100 A - 10mA	Battery life consideration

5. Application Fields

Consumer Electronics: Smartphone compasses (e.g., Apple iPhone 14), AR headsets
Automotive: Electric vehicle battery management, ADAS heading detection
Industrial: Non-destructive testing, magnetic field mapping
Aerospace: Aircraft attitude control, satellite attitude determination

6. Leading Manufacturers & Products

Manufacturer	Representative Product	Key Specifications
Honeywell	HMC6352	2 T resolution, 8Oe range, I2C interface
Infineon	TLE5012B	360 angle measurement, 0.1 accuracy
STMicroelectronics	LSM303DLHC	3D compass, 16-bit output, 0.1 T sensitivity
Bosch Sensortec	BMC150	Ultra-low power, 0.1 T/LSB resolution

7. Selection Recommendations

Key considerations: (1) Match field range to application (e.g., geomagnetic ~50 T vs. motor monitoring ~10mT), (2) Environmental factors (vibration/shock resistance), (3) Interface compatibility (analog/digital), (4) Calibration requirements, (5) Cost vs. performance trade-offs.

Industry Trends

Future developments focus on: (1) MEMS-based magnetic sensors with sub- T resolution, (2) Integrated IMU (Inertial Measurement Units) with magnetometers, (3) Energy-harvesting magnetic sensors, (4) AI-enhanced noise cancellation algorithms, (5) Standardization of wireless magnetic sensor networks.