A high-precision 3-axis magnetometer was released at the TDK and AKM booths at the 2018 Consumer Electronics Show (CES 2018), the world's largest electronics exhibition in Las Vegas, USA.
The magnetometer combines the highly sensitive tunneling magnetoresistive (TMR) components developed by TDK with the advanced electronic compass ASIC designed by AKM into a small LGA 11-pin package. The new TMR magnetometer is attached to a single chip with a micro size of only 1.6 mm x 1.6 mm x 0.6 mm, and features the industry's lowest RMS noise of only 40 nT-rms and an output data rate of 100 Hz. At the same time, the current consumption is also very low, only 40 μA.
Thanks to its high sensitivity of 10 nT/LSB (least significant bit), the magnetic sensor can detect small changes in the magnetic field very accurately, enabling highly accurate detection of position and orientation with the help of the Earth's magnetic field or magnetic field generator. These unique features make the TMR magnetometer suitable for use on compact electronic devices such as smartphones, tablets, game console controllers and a wide range of wearable devices, as well as other applications that require high position and orientation accuracy, such as : Virtual reality, augmented reality or mixed reality (VR, AR and MR) or indoor navigation.
Magnetic sensorA magnetic sensor is one of a wide variety of sensors that sense changes in physical quantities associated with magnetic phenomena and convert them into electrical signals for detection, directly or indirectly detecting the magnitude, direction, displacement, angle, and current of the magnetic field. Such as physical information, widely used in information, electrical, power electronics, energy management, automotive, magnetic information reading and writing, industrial automation and biomedical fields.
With the advancement of science and technology and the development of information technology, people have put forward higher and higher requirements on the size, sensitivity, thermal stability and power consumption of magnetic sensors.
The widely used magnetic sensors are mainly based on the principle of electromagnetic induction, Hall effect and magnetoresistance. Among them, the sensor based on magnetoresistance effect is high sensitivity, small volume, low power consumption and easy
Features such as integration are replacing traditional magnetic sensors.
The main magnetic sensor chips on the market are developed based on the Hall effect, anisotropic magnetoresistance (AMR) and giant magnetoresistance (GMR) effects, and the miniaturization, low cost, and low power of the TMR magnetic sensor chip. Consuming, high integration, high response frequency and high sensitivity make it the commanding height of future competition.
TMR tunnel magnetoresistive sensorThe mainstream magnetic sensor is still a semiconductor Hall device, but its own low sensitivity, easy to be affected by stress and temperature, low response frequency and large power consumption make its dominant position continue to be impacted by the magnetoresistive sensor.
Foreign thin film magnetoresistive sensors (AMR/Sl, in-Valve/TMR) technology has matured and mass production has begun. TMR sensors are currently used in hard disk heads and magnetic memory, representing manufacturers: Seagate/WD/TDK; AMR devices are represented by: HoneyWell/NEC/Japan Asahi Kasei/Siemens; NVE's small-scale mass production GMR sensors and a small number of Spins —Valve sensor.
The development and production of TMR magnetic sensor chips depend on the production equipment, production process and technology of nano-film and nano-scale electronic components, and the design of chips. TMR technology is mainly in the hands of foreign hard disk manufacturers, and magnetic sensor manufacturers generally lack the experience of various technologies, talents and production.
Worldwide, only two companies in the United States can produce TIvIR magnetic sensor chips in small quantities, including NVE and Micro MagneTIcs in the United States. Domestically, they are limited by equipment and talents. A blank in the field.
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