MMA2300D

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Motion sensors, such as accelerometers, can be used to detect changes in acceleration and to measure vibration. The MMA2300D is an accelerometer from Freescale Semiconductor which is designed to meet the requirements for cost-sensitive, low-profile motion sensing applications. In this article, we explore the application field and working principle of the MMA2300D.

Application Field of the MMA2300D

The MMA2300D is a low-cost, two-axis micromechanical accelerometer providing motion detection and peak detection. It is suitable for use in air-flow sensors, computer hard drive protection, and gaming controllers. It is particularly suited for use in gamepads and joypads used by gamers, as it offers both motion detection and peak detection. In these applications, it is used to detect rapid changes in acceleration and rapid, short-term impacts or “shocks”.

The MMA2300D is also used in secure STMicroelectronics applications, exploiting its peak detection abilities to detect tampering attempts. For instance, it can be used to detect if a vehicle component, like an automobile’s hood or trunk lid, has been breached. It is also commonly used in car airbags, to quickly detect changes in acceleration in the event of a crash.

Working Principle

At the heart of the MMA2300D is a capacitive sensing element. This sensor consists of a tiny suspended piece of silicon, etched with a pattern of comb-like fingers. It detects acceleration by measuring the deformation of its shape due to a force applied to the structure. This causes the capacitance of the sensing element to vary, which is converted into proportional voltage output.

The capacitance of the sensing element is also affected by temperature, which can affect the accuracy of the device. To compensate for this, the MMA2300D includes an internal temperature sensor. This measures the temperature of the device and uses the output to compensate for the effect of temperature on the sensing element.

The MMA2300D also has an interrupt buffer which allows it to detect sudden changes in acceleration or brief, rapid shocks. The buffer also allows the device to detect if acceleration exceeds or falls below certain thresholds. This is useful for applications such as computing hard drive protection and airbag systems, which require quick detection of sudden changes.

Conclusion

The Freescale Semiconductor MMA2300D accelerometer is a low-cost, low-profile device suitable for cost sensitive motion sensing applications. It uses a capacitive sensing element to measure changes in acceleration, and includes an internal temperature sensor to compensate for temperature effects on the sensing element. The interrupt buffer allows for detection of sudden changes in acceleration and rapid “shocks”, making it ideal for applications such as gaming controllers, secure STMicroelectronics applications, computer hard drive protection, and automobile air-bags.

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