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ADNS-2220-001 Datasheet(PDF) 1 Page - AVAGO TECHNOLOGIES LIMITED |
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ADNS-2220-001 Datasheet(HTML) 1 Page - AVAGO TECHNOLOGIES LIMITED |
1 / 14 page Introduction This design guide describes the design of a low power consumption optical mouse using the Texas Instrument MSP430F1222 microcontroller, the Avago ADNS-3040 optical sensor and a 27 MHz FSK transmitter implemented with discrete components. The receiver is implemented with a TI TRF9700 receiver and Cypress CY7C63743 USB controller. The document discusses the reference design hardware and the firmware implementation. Included in Appendix A is the schematic for this reference design mouse. The software section of this document describes the architecture of the firmware required to implement the mouse functions. The MSP430F1222 data sheet is available on the TI web site at www.ti.com. The ADNS-3040 data sheet is available from the Avago web site at www. avagotech.com. USB controller data sheet can be found on the Cypress web site: www.cypress.com Key reference design objectives: 1. Highlight the low-power benefit of the ADNS-3040 2. Demonstrate multiple RF technologies: 27 MHz and 2.4 GHz 3. Feature a Flash-based development environment to facilitate rapid firmware changes Reference Design Overview The image-based optical mouse sensor takes snap shots of the surface it is navigating on. It measures changes in position by comparing the sequential images (frames) and mathematically determines the direction and magnitude of movement. The traditional duel-channel optical encoder generates the quadrature Z-wheel movement signals. This design guide illustrates the hardware connection of a LED-based optical mouse with standard configuration; as well as the firmware management and the handling of the USB protocols. USB protocol provides a standard way of reporting mouse movement and button presses to the PC. The Windows HID driver interprets the USB data and performs the cursor movements and mouse clicks. The functional block diagram of the reference design mouse is shown in Figure 1. The optical sensor detects the X and Y movements. An optical quadrature encoder provides the Z-wheel movement. Each of the button switches is pulled up normally and provides a Ground when pressed. The MAX1722 boost regulator maintains the 2.7 V operating voltage for the reference design mouse from two regular AA Alkaline batteries in parallel. ADNK-3043-TI27 Wireless USB Optical Mouse Designer’s Kit Design Guide This preliminary data is provided to assist you in the evaluation of product(s) currently under development. Until Avago Technologies releases this product for general sales, Avago Technologies reserves the right to alter prices, specifications, features, capabilities, functions, release dates, and remove availability of the product(s) at anytime. |
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