Magnetic field sensing apparatus

A magnetic field sensing apparatus, comprising:

• a magnetic flux concentrator, having a plurality of corners;
• a plurality of single direction magneto-resistive sensors, having a same pinning direction, and respectively disposed beside the plurality of corners, wherein a reference axis parallel to one side of the magnetic flux concentrator is defined, and a first acute angle is formed between easy magnetization axes of the plurality of single direction magneto-resistive sensors and the reference axis;
• and
• a time division switching circuit, coupled to the plurality of single direction magneto-resistive sensors, and configured to switch at least a portion of junctions between the plurality of single direction magneto-resistive sensors within different time intervals to change a circuit connection between the plurality of single direction magneto-resistive sensors, so as to form different Wheatstone bridges in different time intervals to measure magnetic field components of an external magnetic field in different directions.