A very simple 3.3V Hall sensor with a bandwidth of 300kHz, based on anisotropic magnetoresistance sensor technology (MCA1101-50-3). Basic recommended data sheet connections: additional linear 3.3V power supply, variable resistors for ESD protection, and capacitors to enhance EMC's resistance to external interference, such as high current injection (BCI), which typically occur in environments requiring the sensor (motor control). The goal is to maintain a high isolation voltage, reduce magnetic crosstalk, and make it a three channel unit. It also needs to be suitable for my single-sided printed circuit board.

Although the schematic of a 3.3V Hall sensor is very simple, the real challenge in such a design is to overcome various errors and noise sources. This type of sensor is highly sensitive to external magnetic fields entering the IC package perpendicular to the top surface of the package. Such a field can cause significant offset errors and even saturate the output. Under static conditions (such as when a magnet is nearby), this offset can be compensated for, but typically under high loads, this problem occurs due to the dynamic magnetic field on the PCB caused by magnetism (inductors, transformers) or nearby high currents.