BCM2042 ? single-chip bluetooth ? mouse and keyboard BCM2042 functional block diagram ? single-chip bluetooth ? device with fully integrated human interface device (hid) profile and full bluetooth stack on-board 8051 processor and ram/rom memory custom-integrated bluetooth core processor has been optimized to support the hid v1.0 profile and minimize power consumption bluetooth version 2.0 compliant including support for adaptive frequency hopping and fast connect integrated 8 kbytes of non-volatile flash memory for storing bluetooth address and configuration data fully integrated radio eliminates all filters and matching components and features a single-pin interface directly to antenna direct interface to keyboard scan matrix with full support for up to 8 x 20 keys and user-customizable hot keys integrated quadrature signal decoder to support both ball and optical mouse designs direct interface to led and lcd displays drive capability to power external optoelectronics rom-based design eliminates external flash memories flash option offered to support feature development fully integrated low dropout (ldo) regulator provides direction interface to batteries integrated switching regulator to support external sensor and more to further reduce bom cost available in 88-pin fpbga and 120-pin fpbga packages cost-optimized solution for mouse and keyboard applications achieves lowest possible cost through the integration of all external components direct interface to key scan matrix or ball/optical mouse encoders replaces existing mouse or keyboard processor and memory and adds bluetooth functionality lowest power consumption solution provides greater than six- month battery life adaptive frequency hopping support ensures full interoperability and coexistence with wlan enabled personal computers optimized radio provides long-range, interference-free operation in high-interference environments transmitter provides +4 dbm output power and satisfies class 2 operation receiver provides -85 dbm receiver sensitivity single monolithic bulk cmos device providing low cost and high availability of manufacturing supply features summary of benefits applications bluetooth mouse bluetooth keyboard remote control hid devices game controllers combination mouse/keyboard rf i/o xtal processing unit 2.4 ghz radio rf control and data bluetooth baseband core gpio gpio for leds, lcd, power, etc. t/r switch frequency synthesizer power mgmt keyboard matrix scanner scan matrix 3-axis mouse signal decoder quadrature inputs system bus switching regulator battery 2.7v to 3.3 v 20 kb boot rom 22 kb ram 108 kb rom 8 kb flash
overview ? phone: 949-450-8700 fax: 949-450-8710 e-mail: info@broadcom.com web: www.broadcom.com broadcom corporation 16215 alton parkway, p.o. box 57013 irvine, california 92619-7013 ? 2005 by broadcom corporation. all rights reserved. 2042-pb01-r 02/16/05 broadcom ? , the pulse logo, connecting everything ? , and the connecting everything logo are trademarks of broadcom corporation and/or its affiliates in the united states, eu and/or certain other countries. bluetooth ? is a trademark owned by bluetooth sig. any other trademarks or trade names mentioned are the property of their respective owners. the BCM2042 is a major breakthrough in the design of low-cost bluetooth mouse and keyboard devices. the BCM2042 is a true single chip that integrates the entire profile, application, and bluetooth protocol stack and is fully compliant with the bluetooth sig specification for human interface devices. the BCM2042 is fully compliant with the version 2.0 bluetooth specificati on, including adaptive frequency hopping and fast connection, which are essential to mouse and keyboard applications in personal computers. integration is key to achieving the system cost targets of today's pc oems. by integrating all components within today's mouse and keyboard into the BCM2042, low system costs can be achieved to approach the price points of legacy-wired mice and keyboards. the BCM2042 can interface directly to mouse optical or ball encoders and keyboard scan matrices. two key integrated components enable the BCM2042 to reach extremely low system bom costs and dramatically extend battery life. the BCM2042 integrates 8 kb of non-volatile memory on-chip. because of this, the BCM2042 does not require external flash or eeprom when designing bluetooth mice or keyboards. also, the BCM2042 integrates a high-performance boost regulator enabling direct connection with mice electronics. the integration of non-volatile ram and the boost regulator enable extremely low system costs. the bluetooth baseband core has been optimized to maximize the battery life and functionality required for a mouse or keyboard application. battery life has been optimized in the BCM2042 to meet greater than 6 months for the typical user using standard battery technology. the BCM2042 integrates a high-performance radio implemented in standard bulk cmos. it incorporates a proprietary self-calibrating vco structure for both excellent phase noise and fast frequency hopping covering the entire band. all filters have been fully integrated into the device and are also self-calibrati ng to automatically compensate for changes in temperature and any process variation during manufacturing. the rf interface to the device fully integrates the t/r switch and its associates matching circuits, enabling direct interface with the antenna. the block diagrams show how the BCM2042 can be used in either a mouse or keyboard application. BCM2042 mouse block diagram BCM2042 keyboard block diagram leds quad. sensors x-axis y-axis scroll left middle/scroll right power control for leds and sensors BCM2042 BCM2042 key scan matrix indicators caps num scroll
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