AN2855 is an application note released by ST, which introduces the single and double click detection functions of FC30, including working principle, pin configuration, entering and exiting single and double click detection mode, entering and exiting power saving mode.
The document provides configuration instructions for the FC30 inertial sensor, enabling it to act as a mouse button by detecting single or double mechanical taps. When configured for click recognition, the device generates an interrupt signal on pin PC upon detecting a tap in any direction.
The guide details specific I2C command sequences required to enter single-click and double-click modes, as well as commands to exit these modes and return to orientation detection. It also covers power-down mode management to reduce current consumption.
The orientation detection function is not available while the device operates in click or double-click recognition mode.
The device generates an interrupt request on the inertial interrupt pin PC when tapped.