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Multiplexing tri-axis accelerometer outputs

Posted: 15 Oct 2009 ?? ?Print Version ?Bookmark and Share

Keywords:tri-axis accelerometer? CD74HCT4051 SN74CBTLV3253 multiplexers? accelerometer Kionix?

A Kionix tri-axis accelerometer with analog outputs provides three output voltages (Xout, Yout, Zout), which are proportional to the respective accelerations in those directions. However, with three analog outputs to digitize, it is possible that the system microprocessor does not have the necessary ADCs. One solution is to use the internal multiplexing capability of several Kionix accelerometer products to multiplex the three outputs to one analog signal. Another solution is to use an off the shelf multiplexer to multiplex the three outputs of the tri-axis accelerometer to one analog signal.

By multiplexing, only one A/D channel is required and the system will maintain the performance of the analog output at a high data sampling rate. Even when multiplexing all three accelerometer outputs, the maximum data sampling rate is still gated by the speed of the system microprocessor's ADC. This application note recommends two Texas Instruments multiplexers, CD74HCT4051 and SN74CBTLV3253, and provides technical information on how to use the internal multiplexer of several Kionix products.

View the PDF document for more information.

Click here to view related datasheets.

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