MEMS gyroscope sensor popular

The market for sensors has become increasingly niubi, smart computers, smart phones, smart cars, smart and accelerometers everywhere, and user interface design applications for motion control.

Low g accelerometer sensing accuracy is limited

In the terminal applications, low-g accelerometer MEMS products can achieve good use efficiency in response to basic type of motion sensing, but in fact, low-g accelerometers have a certain performance in performance and sensing accuracy of components. The degree limit, if the user wants to obtain a more accurate somatosensory operation experience, due to the limitations of the sensor's inductive response, it limits the details of the somatosensory application design.

Similarly, linear accelerometer MEMS, in fact, in the limited capacity of the chip sensing architecture design, and its performance in higher-precision applications show limitations, especially in human-machine interface applications and interactive design programs. At present, the optimal design is to use a Gyrosensor component supporting a multi-axis MEMS and a geomagnetic sensor reference to perform a high-precision dynamic sensing design.

Somatosensory game application for heating MEMS gyroscopes

The so-called gyroscope, in short, is an angular velocity dynamic data that can be measured along one axis or multiple axes. Basically, the use of a gyroscope is used to supplement the MEMS accelerometer design and enhance the dynamic sensing accuracy. The component, through real-time reference of acceleration sensing and angular velocity, allows the operating system to obtain more accurate motion sensing data.

Gyroscope solutions use more and more components and the cost of parts continues to drop. For example, Nintendo launched the WiiMotionPlus controller joystick in 2009, using an additional MEMS gyroscope design solution to enhance the sensory accuracy of the original somatosensory game controller, and MotionPlus to detect the 3D angular velocity variation of the somatosensory joystick. Gaming machine import MEMS gyroscope sales growth nearly 3 times!

Another smart phone product is also keeping pace with the use of MEMS gyroscopes. The iPhone4 is the world’s first smart phone with built-in MEMS gyroscopes, and suppliers of MEMS gyroscopes for smart phone applications include STMicroelectronics, InvenSense, and Analog Devices.

MEMS gyroscopes are also widely used in digital camera's electronic anti-shock design, notebook computer's hard drive drop protection, 3D space mouse, digital electronic compass, automotive ESC/ESP system design, or with automatic control system. Robotic control arm dynamic balance design scheme.

Accelerometer Integrates Gyroscopes to Increase Application Value

At present, most accelerometers and gyroscopes are usually integrated design to construct a complete motion track that can dynamically track and capture 3D space. Take the existing MEMS gyroscope as an example. The MEMS gyroscope is also known as the angular velocity meter. In fact, the core components of the MEMS gyroscope are a set of micromachining mechanical assemblies that have undergone silicon process, and are referenced to a group of silicon structures. Like the operation mechanism of the tuning fork mechanism, the angular velocity sensing of the application device is based on the alternating Coriolis force caused by mutually orthogonal vibration and rotation, and the vibrating object is suspended from the base by a flexible elastic structure. The MEMS gyroscope's overall dynamics system is integrated by the 2D elastic damping system. The Coriolis force generated by the vibration and rotation in the system transfers the angular velocity energy to the sensing mode, and the angular velocity is converted into the specific sensing structure. Straight displacement, through the MEMS structure and then obtain a change in the amount of sensing information.

The biggest difference between the gyroscope and the accelerometer is that the gyroscope's measured data is more skew than the inclination, yaw and other dynamic information, but rather with the gravity, linear motion sensing data is more independent, gyroscopes in the detection of object level changes When it is more effective, it can't be as sensitive as the accelerometer to the moving or moving kinetic energy of the object. On the contrary, accelerometers can be highly effective in detecting the moving state of an object, but they cannot sense small changes in the angle of the object. Therefore, by integrating the accelerometer and the gyroscope, the dynamic sensing system can simultaneously provide sensing information of the straight speed and rotation data, so that the detection range of the dynamic sensing system is more comprehensive and complete.

In the energy-saving design of MEMS, when the system does not need to use dynamic sensing applications, MEMS can be used to close part of the function to achieve high efficiency and energy saving. For example, in a gyroscope design scheme, the gyroscope's transmission signal and regulation circuit can be divided into two parts: the motor drive part and the accelerometer sensor circuit. The motor drive part uses the principle of electrostatic drive to make the mechanical components After the oscillating/absorbing operation, the resonant action required for the sensing process is generated. As for the sensing part, the amount of change in the capacitance of the measuring system is used to obtain the numerical change of the Coriolis force and the weak displacement data generated on the corresponding sensing particle point. The angular rate change is converted to the corresponding analog signal (or digital signal) output of the change in the angular velocity.