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MEMS motion-sensing tech for noise, power control

Posted: 11 Nov 2013 ?? ?Print Version ?Bookmark and Share

Keywords:Kionix? MEMS? accelerometer? noise value?

Kionix Inc. has unleashed its latest breakthrough in MEMS motion-sensing technology that allows system designers to set and dynamically adjust power and noise values to meet their system's unique requirements and obtain optimal performance. The FlexSet Performance Optimiser is built into Kionix's latest accelerometers, including the KX022 (2 x 2mm) and KX023 (3 x 3mm), noted the firm.

FlexSet includes an online and downloadable GUI as both a design tool and informational reference. Representative of the actual register selections that designers will have when customising the accelerometer parameters, this tool allows system designers to tune the performance of their system through precise design parameter choices. Instead of a limited number of preset values, designers will have control of a wide range of switch selections and pull-down menus that provide a variety of operational configurations including ODR, sample averaging, operating modes, sample buffering, bandwidth and more, stated the firm.

The FlexSet UI demonstrates the resulting impact on power consumption and noise, so system designers can customise the accelerometer for their application and obtain optimised performance. It also includes a "Compare Cases" mode so designers can do side by side comparisons of various settings.

While system designers typically want the lowest power as well as the lowest noise values, these parameters present a trade-off. More samples taken in a given timeframe and increased averaging improve the accuracy. But more complicated filtering and other features designed to improve the accuracy of the readings and avoid noise-related inaccuracies increase power consumption.

In addition, FlexSet enhances the programmability of integrated algorithms that allow system designers to easily implement other system capabilities such as screen rotation, Tap/Double-Tap and motion wake-up functions. FlexSet can also turn on and off the algorithm engines, providing even greater power saving opportunities.

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