New pressure sensor features LIN interface

Melexis has introduced the MLX90833, a new pressure sensor with Triphibian technology, facilitating robust measurement of gas and liquid media from 2 to 70 bar, all within a compact SO16 package. This factory-calibrated device delivers absolute pressure readings with a LIN digital output, simplifying integration for heat pump manufacturers.

The increasing number of heating and cooling modes in heat pumps, particularly EVs, is driving demand for standalone digital-enabled sensors. These systems, which often include smart expansion valves, coolant pumps, and compressors, need efficient communication with the central control unit. Using a digital bus like LIN decreases wiring complexity, improves system intelligence, and allows advanced diagnostics. This trend is particularly prominent in Europe, where LIN rapidly replaces legacy analog sensor outputs.

Heat pump systems in BEVs can need five or more pressure and temperature sensors to provide optimal performance. These sensors play a crucial role in regulating the high-voltage electric compressor and controlling the various expansion valves within the system. Integrating a LIN interface simplifies data transmission and system design compared to traditional analog or SENT connections.

Furthermore, factory calibration of Triphibian products greatly lowers customers' development time and complexity. Unlike non-Triphibian solutions, where customers must source separate sensing elements and signal conditioning ICs and invest in end-of-line calibration equipment, the device comes fully calibrated and ready to integrate. This streamlines module design and lowers manufacturing costs.

"The MLX90833 is a game-changer for heat pump manufacturers," says Laurent Otte, senior product line director at Melexis. "Its ability to handle high pressures and gas and liquid media, combined with the LIN interface, simplifies system design and improves overall efficiency."

The MLX90833 is a fully integrated solution, including a MEMS sensor, signal conditioning, and digital output drivers. It delivers high accuracy (±0.5% FSO) and is developed as a Safety Element out of Context (SEooC) under ISO 26262, meeting the stringent safety needs of modern EVs.