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Interfacing the KXP94 or KXR94 tri-axis accelerometer with TI's MSP430F149 microprocessor to measure tilt and other motions

Posted: 14 Oct 2009 ?? ?Print Version ?Bookmark and Share

Keywords:tri-axis accelerometer? KXP94 KXR94 accelerometer? microprocessor MSP430F149?

This application note describes how to integrate the Kionix KXP94 or the KXR94 tri-axis accelerometer with the MSP430F149 to capture and use the motion sensing capabilities of the accelerometer. Example code is provided for capturing and using tilt sensing, vibration sensing and acceleration. Source code is provided for the MSP430F149 as well as source code for the demonstration software drivers and applications.

Kionix linear accelerometers function on the principle of differential capacitance. Acceleration causes displacement of a silicon structure resulting in a change in capacitance. A signal-conditioning CMOS technology ASIC detects and transforms changes in capacitance into an analog output voltage, which is proportional to acceleration. The output voltage is sent to the MSP430F149 ADC for conversion to a digital signal. This signal can then be sent to a serial port, an IR chip, a flash NAND for storage, a USB port, through SPI or I?C to another processor etc.

View the PDF document for more information.

Click here to view related datasheets.

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