Tag Archives: Hall

Diodes has created a trio of tiny magnetic field triggered sensors that operate from low-voltage rails between 1.1 and 2V. Called AH1899x, they have two power pads and a binary output that is either high or low depending on the local field. Packaging is a 1 x 1 x 0.4mm DFN1010-4. To save power, each includes measure-then-sleep logic and only ...

There are two sensor choices, reed and Hall-effect switches. They have many similarities but also significant differences, explains Martin Reizner. Demand for reed switches has risen significantly in the recent past. This is primarily due to their mechanical structure, which reduces energy consumption to zero when the switch is in a passive state. That is why reed switches are an ...

Aiming at industrial and automotive applications, Diodes has introduced a portfolio of Hall-effect sensors for measuring linear and angular speed and direction. Called AH39xxQ, “they also have a 40V absolute maximum rating, enabling them to safely handle 40V load dumps”, according to the company. “Additionally, -18V of reverse voltage protection guards against incorrect battery connections. For added robustness, the ESD ...

Texas Instruments has picked the Hall effect for its latest isolated current sensor, and claims 50ppm/°C drift over temperature and ±0.5% drift over lifetime. Aimed at electric vehicle chargers and with versions available up to 75Arms, isolation in the TMCS1123 is rated at 1.1kVdc, and to withstand 5kVrms. “Assessment of device lifetime working voltages follow VDE 0884-11 for reinforced insulation, ...

Diodes has introduced three-pin SOT23 automotive qualified Hall effect magnetic sensing ICs that latch on with one magnetic pole and off with the other. The open-drain output of AH1711Q, AH1712Q and AH1713Q will be switched on when applying a magnetic south pole of sufficient strength near the top of the package (perhaps with north below the package), while a north ...

Diodes has added diagnostics to two-wire Hall-effect switches to ready them for ISO 26262 automotive functional safety. “They monitor main device blocks, supply voltage and temperature, with a third lower current output state,” according to the company. “This enables them, as a ‘safety element out of context’ [SEooC] to support ISO 26262 functional safety system integrations.” Applications are foreseen in automotive ...

Allegro is claiming a record for its latest Hall-effect position sensor IC, describing it as “the smallest sine/cosine 3D sensor currently available in the market”. Called A33230, it comes in 3 x 2.9 x 1mm 5pin SOT23-W package. Although the die inside is able to sense in three orthogonal dimensions, it has two signal paths and devices are factory programmed ...

Allegro Microsystems is advocating GMR – giant magneto-resistive – effect sensors instead of Hall effect for automotive rotary wheel position sensing. The company, which makes both Hall and GMR sensors, argues that GMR has lower noise and therefore reduces angular jitter when measuring the position of rotating shafts. “GMR is fundamentally a lower-noise magnetic sensing technology than Hall effect for ...

Texas Instruments is claiming “industry’s most accurate 3D Hall-effect position sensor” for one that provides 2.6% full-scale total error at room temperature. The first device in a family of 3D Hall-effect position sensors, TMAG5170 is intended for factory automation and motor-drives. Designed for rotational sensing (diagram below), it has three independent Hall sensors for X, Y, and Z-axes backed by ...

Melexis has introduced a Hall-effect current-sensing IC aimed at cost-sensitive automotive applications: belt-driven starter generators and traction inverters for low-speed electric vehicles, e-scooters, electric forklift trucks and pallet trucks. Called MLX91211, it is used with a ferromagnetic core around a conductor to generate an analogue output proportional to the current flowing in the cable or bus bar. The output signal has a ...