The increasing number of heating and cooling modes in heat pumps, especially in electric vehicles (EVs), is driving demand for standalone sensors with digital interfaces. These systems, which often include smart expansion valves, refrigerant pumps, and compressors, require efficient communication with the central control unit. Using a digital bus like LIN reduces wiring complexity, improves system intelligence, and enables advanced diagnostics. This trend is particularly pronounced in Europe, where LIN is rapidly replacing legacy analog sensor outputs.
Heat pump systems in battery electric vehicles (BEVs) may require five or more pressure and temperature sensors to ensure optimal performance. These sensors play a crucial role in regulating the high-voltage electric compressor and controlling the system's various expansion valves. By integrating a LIN interface, the MLX90833 simplifies data transmission and system design compared to traditional analog or SENT connections.
Furthermore, factory calibration of Melexis Triphibian™ products significantly reduces development time and complexity for customers. Unlike non-Triphibian solutions, where customers must separately source sensing elements, signal conditioning ICs, and invest in end-of-line calibration equipment, the MLX90833 comes fully calibrated and ready for integration. This streamlines module design and reduces manufacturing costs.
Key features of the MLX90833:
● Extended pressure range: MEMS sensor that measures pressures up to 70 bar, overcoming the limitations of traditional sensors.
● Gas and liquid compatibility: Provides accurate readings in both media, simplifying system design.
● Digital LIN output: Enables seamless integration into bus-connected systems, reducing wiring complexity.
● Enhanced durability: Equipped with advanced overvoltage (above +40 V) and reverse voltage (below -40 V) protection mechanisms, making it suitable for demanding applications, including trucks.
“The MLX90833 is a game-changer for heat pump manufacturers,” says Laurent Otte, Senior Product Line Manager at Melexis. “Its ability to handle high pressures and both gaseous and liquid media, combined with the LIN interface, simplifies system design and improves overall efficiency.”
The MLX90833 is a fully integrated solution that includes a MEMS sensor, signal conditioning, and digital output controllers. It boasts high accuracy (±0.5% FSO) and is designed as a Safety Out of Context (SEooC) element according to ISO 26262, meeting the stringent safety requirements of modern electric vehicles.
