features set forth in this document shall immediately voidany warranty granted by ST for the ST product or service described herein and shall not create or extend in any manner whatsoever, anyliability of ST.ST and the ST logo are trademarks or registered trademarks of ST in various countries.Information in this document supersedes and replaces all information previously supplied.The ST logo is a registered trademark of STMicroelectronics. All other names are the property of their respective owners. 2006 STMicroelectronics - All rights reservedSTMicroelectronics group of companiesAustralia - Belgium - Brazil - Canada - China - Czech Republic - Finland - France - Germany - Hong Kong - India - Israel - Italy - Japan - Malaysia - Malta - Morocco - Singapore - Spain - Sweden - Switzerland - United Kingdom - United States of Americawww.st.com datasheet.27MHz Wireless mouse block diagramThese blocks are described in more detail in the following sections.Optical sensor The optical sensor is the heart of the system. Images of the surface underneath the mouse are focussed onto the sensor using a suitable lens. The differences between subsequent images are analyzed in order to determine what, if any, movement has occurred.LEDis controlled by the optical sensor. The light from the LED is directed onto the surface using a light-guide which is often contained within the same assembly as the lens.MCUA microprocessor (MCU) is used to control the complete mouse system. The MCU is used to configure the optical sensor and to read data from it. The data is encoded and then sent handled by the MCU. The firmware running inside the MCU is responsible for the power management of the whole system.SurfaceLEDOpticalsensorLensMCURF stageBattery and powersupply circuitrySwitches, Z-wheel, etc.www.st.comAN24732/10 RF output stageThe RF output stag December 2006 Rev 11/10AN2473Application noteOptic Application Notes;Computer And Peripherals;Consumer;Imaging & Display;VT5366;AN2473