Tokyo, September 18, 2025 – Ablic has launched a new series of two-dimensional dual Hall effect ICs that provide accurate rotational detection for opening and closing mechanisms. The devices have versions optimized for automotive-grade applications as well as for consumer-grade motor applications.
The S-57W1/W2 series is an automotive-grade 2D dual hall effect latch IC while the consumer-use S-5791/92 2D dual hall effect latch IC, featuring the same key characteristics, is suitable for a wide range of consumer motor applications including pedal rotation detection in electric bicycles, power tools and robotic vacuum cleaners.
The device converts mechanical rotational motion into electrical signals. It outputs pulse signals representing changes in relative position from the start of motor operation, making it ideal for incremental encoder applications, where information such as rotation speed and direction is derived from this signal.
Previously, says Ablic, detecting mechanical rotational motion required two ICs, each capable of sensing magnetic flux in only one direction. The S-57W1/W2, however, contains a single chip with built-in Hall elements that detect magnetic flux density in two different directions, enabling detection with just one IC. According to Ablic, with the industry’s highest magnetic sensitivity of 0.8 mT, the IC achieves high-resolution rotational detection.
With the rise of vehicle electrification and advances in autonomous driving, the number of motors in automobiles continues to grow, components such as power windows, sunroofs, power sliding doors, and power liftgates now require smooth operation and precise positioning. The S-57W1/W2 detects the rotational speed and direction of motors driving these components with high precision, all on a single chip.
In a rotational detection mechanism using two Hall ICs—each capable of detecting only a vertical magnetic field—there was a constraint that the two ICs had to be positioned to detect signals with a 90-degree phase difference.
The S-57W1/W2 integrates Hall elements that detect magnetic flux in two different directions within a single IC chip, automatically generating signals with a 90-degree phase difference. This significantly improves ease of design and eliminates the need to redesign the circuit board when changing the number of magnetic poles on a multi-pole ring magnet.
Increasing the number of magnetic poles on a ring magnet is an effective way to improve the resolution of rotational detection. However, adding more poles reduces the volume of each magnetized section, which in turn weakens the magnetic flux density. So the S-57W1/W2 series includes a high-sensitivity version with a value of 0.8 mT typ., enabling detection of even weak magnetic flux densities. This makes it suitable for use with ring magnets featuring a high number of poles. For more info, see www.ablic.com.
