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Using the Auxillary Input of the KXPB5

From Kionix, Inc.

This application note explains how to use the auxiliary input of the KXPB5 accelerometer to add an analog sensor input to any application that uses the KXPB5 in SPI mode (mode 00). This feature is useful for adding an analog input to an application where there are no analog inputs available in the main microprocessor, only a SPI bus. As an example, this application note shows a single-axis gyroscope connected to the auxiliary input of the KXPB5. The KXPB5 receives the analog output of the gyroscope and converts it to a 12-bit digital signal that can be read through SPI communication. A recommended circuit schematic and example SPI communication are included.

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