AN3308 datasheet(38/52 Pages) STMICROELECTRONICS

Part #	AN3308

Description	This document describes the low-voltage 3-axis digital output linear MEMS accelerometer provided in an LGA package

PDF	52 Pages

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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38 / 52 page

Click and double click recognition

AN3308

38/52

Doc ID 18198 Rev 1

8.4.3

Playing with TAP_Window

In cases of double click recognition, the TAP_Latency + TAP_Window defines the maximum

distance between two consecutive clicks to be recognized as a double click event. By fixing

the latency to avoid spurious bouncing of the signal, it is possible to play with the

TAP_Window as with the “double click speed” settings of the mouse properties on the PC.

Figure 21 shows an acquisition done with TAP_Window = 42h (1065 ms). With this setting

the two consecutive peaks of acceleration are too far apart and the second one occurs

outside of the window.

In Figure 22 an acquisition carried out with TAP_Window = FFh (637 ms) is shown. With this

setting the device correctly generates the double click interrupt after the second acceleration

peak.

Figure 21.

Short window

Figure 22.

Long window

AN3308 Datasheet(PDF) 38 Page - STMicroelectronics