AN2855

Theory of operation

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Theory of operation

The click recognition function featured in the FC30 helps to create a man-machine interface

with little software loading. The device can be configured to output an interrupt signal on a

dedicated pin when tapped in any direction.

If the sensor is exposed to a single input stimulus, it generates an interrupt request on

inertial interrupt pin PC. A more advanced feature allows the generation of an interrupt

request when a double input stimulus with fixed time between the two events is recognized,

enabling a mouse button-like functionality.

Note:

While the device is operating in click/double-click recognition mode, the orientation

detection function is not available.

1.1

Device pinout for click recognition mode

Click recognition mode is enabled through specific commands sent to the device over the

Figure 1).

Figure 1.

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Top VIEW

10uF

Vdd

100nF

GND

Vdd_IO

Digital signal from/to signal controller.Signal’s levelsare defined byproper selection of Vdd_IO

AM03290v1