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Dongguan Hallsen Technology Co., Ltd
For the application of Hall switch in portable beauty instrument, it is recommended to use omnipolar low-power Hall switch.
Omnipolar Hall switch (non-polar Hall switch) detects magnetic field regardless of south pole (S) or north pole (N), responds to any magnetic pole, and responds as long as there is a magnetic field approaching; it outputs low level when the magnet approaches and high level when it is far away. Note: Please distinguish it from bipolar Hall. Omnipolar Hall can sense NS magnetic field.
HS248 is a non-polar Hall switch based on mixed signal CMOS technology. This IC adopts advanced chopper stabilization technology, so it can provide accurate and stable magnetic switch points.
In terms of circuit design, HS248 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 high current consumption enter the "sleep" mode periodically;
Through this mechanism, the chip is periodically "woken up" and detects the strength of the magnetic field 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 HS248 is locked in the on state when there is a certain strong south pole or north pole magnetic field facing the package marking side, and locked in the off state when there is no magnetic field.
Application principle of Hall switch in water replenishment instrument: When the user puts a finger or other part close to the sensing area, the Hall switch senses the change of the magnetic field, triggers the water pump to start, and makes the water flow out of the nozzle. When the user moves away from the sensing area, the magnetic field change is sensed again and the water pump stops working. This automatic start-stop function makes the water replenishment meter more intelligent. Users do not need to manually control the water flow, making it more convenient to use.
Recommended model: HS248/HS481 full-extreme micro-power Hall switch
