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Hall-Effect-Latches and Bipolar Switches
Hall-effect latches are most comm in sensing multi-pole ring magnets for motor commutation, because they require a south pole of sufficient strength to turn the output on and a north pole of sufficient strength to turn the output off. These contactless senonly usedsing solutions require few external components and can withstand the hostile operating conditions of automotive applications.
Specific advantages of Allegro's solutions include:
- 4× chopper-stabilisation for offset cancellation provides: enhanced switch point stability that increases accuracy in measuring motor speed or duty cycle, and industry leading jitter performance that is 2× better than competitor devices
- Low voltage (3 V) operation and lower ICC for more power efficient devices
- Certain products (A1225, A1227, A1229) are designed to survive harsh automotive transient conditions, including double battery and 40 V load dump, without a limiting series resistor, eliminating the need for external components and preventing transient voltage field failures
Allegro is a market leader in the area of Hall latches, and has a broad range of part sensitivities for latches that cover any desired magnetic switch points for just about any application requirement.
Hall-Effect Latches and Bipolar Switches - without Chopper Stabilisation
This section includes products developed for very specific application needs. Please consult with your local Allegro Field Applications Engineer to confirm if one of these products is the best choice for your design.
Specialised applications
Continuous-time devices have generally been superseded by chopper-stabilised implementations. However, there are a few specialised applications where continuous-time switches or latches might be appropriate:
- 4× chopper-stabilisation for offset cancellation provides: enhanced switch point stability that increases accuracy in measuring motor speed or duty cycle, and industry leading jitter performance that is 2× better than competitor devices
- Low voltage (3 V) operation and lower ICC for more power efficient devices
- Certain products (A1225, A1227, A1229) are designed to survive harsh automotive transient conditions, including double battery and 40 V load dump, without a limiting series resistor, eliminating the need for external components and preventing transient voltage field failures
Allegro is a market leader
Allegro is a market leader in the area of Hall latches, and has a broad range of part sensitivities for latches that cover any desired magnetic switch points for just about any application requirement.
Dual Hall-Effect Latches
Dual element devices are integrated circuits that contain two independent Hall-effect switches. The digital outputs are out of phase so that the outputs are in quadrature when interfaced with the proper ring magnet design (alternating pole ring magnet).
Extremely low-drift amplifiers
Extremely low-drift amplifiers guarantee symmetry between the switches to maintain signal quadrature. The Allegro patented, high-frequency chopper-stabilisation technique cancels offsets in each channel providing stable operation over the full specified temperature and voltage ranges.
Increased analogue signal-to-noise
The high-frequency chopping circuits allow an increased analogue signal-to-noise ratio at the input of the digital comparators internal to the IC. As a result, the A1230 achieves industry-leading digital output jitter performance that is critical in high performance motor commutation applications.
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