MMA6851BKW

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Motion Sensors are electronic devices that measure and detect varying motions such as velocity, acceleration, and angular motion. They convert the detected physical motion parameters into electrical signals that can be read, processed, and analyzed by an appropriate system. Among all motion sensors, Accelerometers are a type of motion sensing device that measures the acceleration of objects in respect to freefall. MMA6851BKW is a 3-axis accelerometer based on microelectromechanical system (MEMS) technology. In this article, we will look into the application field and working principle of this device.

MMA6851BKW accelerometer can be used in many different applications. The device can be used in security & monitoring systems to detect activities such as a person walking, or running. It is also used in aerospace and automotive applications, most notably to detect and measure dynamic changes in orientation. The device is extensively used in inertial navigation systems and therefore can be used to measure the position and attitude of an aircraft or spacecraft. Due to its low power consumption, it is also often used as a sensing device in portable devices such as games and smartphones.

MMA6851BKW measures acceleration using piezoelectric transduction principle in a MEMS accelerometer. The piezoelectric effect involves the generation of electrical charge when a material undergoes mechanical stress. The device consists of two components – a mass and a spring. The acceleration of an object in the environment causes the mass to move, while the spring exhibits a restoring force. The resulting displacement of the mass is proportional to the acceleration and is transduced into a proportional electrical charge via the piezoelectric effect. To measure acceleration in 3-dimensional space, the device has 3-axes of sensing.

At the heart of MMA6851BKW is an ultra low-power digital signal processor (DSP). The DSP is responsible for monitoring the signals from the MEMS piezoelectric transducer and filtering out unwanted noise. The filtered signals are then amplified and digitized using a 12-bit ADC. The digitzed data is then transferred to an I2C interface for further reading and/or processing. The device features power-saving sleepmode and an operating range of 16g.

MMA6851BKW is a MEMS based 3-axis acceleration sensore from Infineon. It is ideal for low power applications such as security systems, automotive and aerospace applications, and portable electronic devices. The working principle of the device involves the use of miniaturized piezoelectric transduction that converts the acceleration of an object into electrical charge. The output of the device is then filtered, amplified, and digitized by the on-board DSP before being sent to the I2C interface for further processing.

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