On November 22, 2024, Tyson Delo, Belgium - Melexis, a global microelectronics engineering company, announced the launch of a new current sensor chip MLX91235 that abandons magnetic core design. It can more accurately measure large currents flowing through external main conductors such as PCB traces and busbars. This product is designed specifically for the automotive and alternative travel industries, and can support a wide range of application scenarios such as inverters, battery management systems (BMS), and DC-DC converters on the low voltage side.

MLX91235 Package Product Figure.jpg

Power electronics designers in the field of modern electric vehicles (EVs) have always faced the dual challenges of system size and weight, and the demand for smaller and lighter solutions is very urgent. The gradient measurement sensor MLX91235 from Mailai Xin achieves a more compact size design compared to traditional current sensor technology by abandoning the magnetic core design of magnetic aggregation, and effectively eliminates measurement errors caused by hysteresis phenomenon. This sensor utilizes magnetic field differential measurement technology between two internal sensing elements, which not only provides high-precision current feedback but also effectively resists the influence of stray magnetic fields. With a bandwidth of 500kHz and a response time of only 2 microseconds, the MLX91235 has demonstrated outstanding performance in high-speed applications such as motor control and converters.

Digital Architecture and Accuracy

MLX91235, with its intelligent digital architecture, not only ensures excellent measurement accuracy, but also enhances sensor performance and integrates multiple key functions, greatly promoting the efficiency of development, calibration, and system integration. Compared to the commonly used piecewise linear compensation methods in analog architectures, MLX91235's digital architecture demonstrates stronger capabilities in handling inherent nonlinear characteristics, enabling more accurate and advanced compensation strategies, resulting in more accurate and smooth data output. In addition, the sensor also adopts full digital temperature compensation technology to further ensure high-precision measurement throughout the entire working range.

Open calibration through SPI

The MLX91235 adopts an "open" calibration design and is configured through a standard serial peripheral interface (SPI), making it easy for any microcontroller unit (MCU) to achieve online calibration. Compared with analog coreless sensors, the digital calibration method of this device is more intuitive and fast, and can easily adjust parameters such as digital gain correction, greatly improving the flexibility and efficiency of calibration.

Overcurrent detection and temperature monitoring

The MLX91235 has a built-in 16 bit overcurrent detection (OCD) function, supports asymmetric threshold settings, and provides two freely configurable threshold intervals. In addition, this feature also has a configurable detection time of up to 2 microseconds, and can choose to apply anti false alarm strategies to effectively reduce the occurrence of false alarms in environments with poor electromagnetic compatibility (EMC). The MLX91235 also integrates a 10 bit temperature feedback mechanism, which can accurately output junction temperature measurement values through a high-speed SPI interface.

Functional safety and self inspection

MLX91235 complies with ISO 26262 standard and has been certified as a Safety Element (SEooC) compliant with ASIL B-level independent environment. In addition to meeting the strict requirements of ASIL B, the sensor also has an advanced self-test function built-in, which can be easily triggered through the SPI interface. This self checking function can comprehensively monitor and report multiple key parameter information, including temperature, undervoltage, and mechanical stress. It is worth mentioning that compared with traditional diagnostic methods, this self checking function covers the complete signal chain from sensors to application MCUs.

Bruno Boury, Director of Product Line at Mindray, stated, "Mindray has a long history in the field of sensing technology, and the magnetic core less sensor MLX91235 is a leader in our new generation of products." He further elaborated, "This sensor combines online rapid calibration, OCD functionality, ISO 26262 standard compliance, and high precision brought by digital cores. These outstanding features, combined with the comprehensive support we provide to our customers, are the key to Mindray's successful introduction of this new technology into this field

MLX91235 is tailor-made for current sensing applications in the automotive and industrial fields, and is widely used for PCB and bus current sensing in systems such as inverters, low-voltage DC-DC converters, chargers, electric heating catalysts (EHCs), battery management systems (BMS), and intelligent thermal fuses.

The MLX91235 engineering sample and DVK91235 development kit have both been released. The product is expected to be fully certified by mid-2025.

About Mailaixin Company

Melexis is committed to designing, developing, and providing cutting-edge sensing and driving solutions, putting people first and caring for the earth. Our mission is to assist engineers in translating their ideas into practical applications, working together to create a safe, comfortable, and sustainable future, making beautiful visions a tangible reality.

We focus on the automotive market and provide microelectronic solutions widely used in technology fields such as powertrain, thermal management, lighting, electronic braking, electronic steering, and batteries. At the same time, we actively explore emerging markets such as sustainable world, alternative mobility, robotics, and digital health, leading the trend of innovation.

Since its establishment in Belgium in 1989, Mindray has grown into a multinational enterprise with over 2000 employees spread across 12 countries worldwide, providing customers with cutting-edge technical support.

This is reported by Top Components, a leading supplier of electronic components in the semiconductor industry

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