Controlling car motors for doors, windows, and sunroofs can be tricky. A new chip can track motor movement in one small package.
Let us talk about modern vehicles today. Automotive motors are an integral part of the vehicle design. They power systems like windows, sunroofs, sliding doors, liftgates, and dial-type controllers. Precise control of these motors ensures safety, smooth operation, and reliable performance, especially as vehicles become more electrified and autonomous. Accurate detection of rotation speed and position is critical to make these motors work efficiently and respond correctly to driver or automated commands.
Traditional detection systems often required two separate ICs to sense magnetic flux in different directions, making circuits bulky and complex. The S-57W1/W2 series from ABLIC addresses this by combining two-direction magnetic sensing into a single chip. It converts mechanical rotation into electrical pulse signals that track position from the start of motor operation. Its high sensitivity of 0.8 mT enables detection of weak magnetic flux from magnets with multiple poles, supporting high-resolution rotational measurement. The IC automatically generates signals with a 90° phase difference, eliminating the need to redesign circuit boards when using multi-pole ring magnets.
Some of the key specifications of the S-57W1/W2 series include:
- Output Types: Rotation speed/direction or quadrature output
- Detection Axes: XY, ZX, or ZY
- Output Logic: Configurable high/low outputs
- Output Configuration: Nch open-drain or Nch driver with 10 kΩ pull-up
- Magnetic Sensitivity (BOP): 0.8 mT, 2.0 mT, or 6.0 mT
- Output Delay: 8.4 µs typical
- Packages: SOT-23-5, HSNT-6 (2025)
The device is configurable for rotation speed/direction output or quadrature output, supports multiple detection axes, and offers selectable output logic and configuration. Its short 8.4 µs typical output delay ensures reliable tracking of high-speed rotation. The IC comes in compact SOT-23-5 and HSNT-6 packages, with the HSNT-6 being the thinnest 2D dual hall effect latch IC available, ideal for space-constrained motors. By providing precise, high-resolution detection in a single chip, the series helps engineers simplify designs, save space, and meet the growing demand for accurate motor control in modern vehicles.
