HS4915 is a polarity-free Hall switch based on mixed-signal CMOS technology. This IC uses advanced chopper stabilization technology to provide accurate and stable magnetic switch points.
In terms of circuit design, HS4915 provides an embedded controlled clock mechanism to provide a clock source for the Hall device and analog signal processing circuit. At the same time, this controlled clock mechanism can send a control signal to make the circuit with large current consumption periodically enter the "sleep" mode; through this mechanism, the chip is periodically "woken up" and detects the magnitude of the magnetic field strength passing through the Hall device according to the predetermined magnetic field strength threshold. If the magnetic flux density is higher than the "operating point" threshold or lower than the "release point" threshold, the open-drain output transistor is driven and latched into the corresponding state. During the "sleep" cycle, the output transistor is locked in its previous state. In battery-powered applications, this design provides the best support for extending the working life.

The output transistor of HS4915 is locked in the on state when there is a certain strong south or north magnetic field facing the package marking side, and is locked in the off state when there is no magnetic field.
HS4915 has higher magnetic field sensing sensitivity than HS213 and can be used in security systems and places where the sensing magnet is small.