Programmable Hall effect sensor IC for EVs and HEVs

9th December 2013
Nat Bowers

Enhancing its customer programmable Triaxis Hall effect sensor IC portfolio, Melexis introduce the MLX91208 series. Operating over a wide temperature range from -40°C to +150°C, the high speed MLX91208 Hall effect sensors are ideally suited for electric vehicle, hybrid electric vehicle, and renewable energy system applications.

Additionally suited to precision DC and AC current measurements up to 200kHz frequencies, the MLX91208 sensor ICs feature a response time of just 3μs, strong galvanic isolation, typical thermal sensitivity drift of ±150ppm/°C, and stable accuracy level over both operational lifespan and temperature.

While the built-in EEPROM memory stores parameters such as sensitivity, gain and offset, the transfer characteristics of the MLX91208 devices are fully adjustable. The MLX91208 enables highly efficient production flows thanks to the Melexis Programming Through Connector calibration protocol. Modulating the supply voltage, this protocol eliminates the need for an additional pin for programming.

Featuring Melexis’ patented Triaxis technology, current sensing systems based on the MLX91208 series are expected to exhibit accuracy levels exceeding ±0.5% at room temperature or ±2% at the extremes of the specified temperature range. The MLX91208 sensors feature industry-leading sensitivity as a result of the Integrated Magnetic Concentrator layer deposited onto the semiconductor die.

There are two version of the MLX91208 series currently available: the MLX91208CAL features a large IMC layer for the detection of very low magnetic fields (100mV/mT to 700mV/mT); and the MLX91208CAH which is aimed at detection of medium fields (50mV/mT to 300mV/mT).

Supplied in a standard SO-8 package, target applications for the MLX91208 series Hall effect sensor ICs include: battery current and motor current monitoring in automotive applications (HEV, EV, mild HEV, etc.) and renewable energy applications (such as solar power converters).

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