BCM2042
SINGLE-CHIP BLUETOOTH® MOUSE AND KEYBOARD
FEATURES SUMMARY OF BENEFITS
• Single-chip Bluetooth® device with fully integrated Human • Cost-optimized solution for mouse and keyboard applications
Interface Device (HID) profile and full Bluetooth stack • Achieves lowest possible cost through the integration of all
• On-board 8051 processor and RAM/ROM memory external components
• Direct interface to key scan matrix or ball/optical mouse
• Custom-integrated Bluetooth core processor has been encoders
optimized to support the HID v1.0 profile and minimize power
consumption • Replaces existing mouse or keyboard processor and memory
and adds Bluetooth functionality
• Bluetooth version 2.0 compliant including support for adaptive
frequency hopping and fast connect • Lowest power consumption solution provides greater than six-
month battery life
• Fully integrated radio eliminates all filters and matching
components and features a single-pin interface directly to • Adaptive frequency hopping support ensures full
antenna interoperability and coexistence with WLAN enabled personal
computers
• Direct interface to keyboard scan matrix with full support for
up to 8 x 20 keys and user-customizable hot keys • Optimized radio provides long-range, interference-free
operation in high-interference environments
• Integrated quadrature signal decoder to support both ball and • Transmitter provides +4 dBm output power and satisfies Class
optical mouse designs 2 operation
• Direct interface to LED and LCD displays • Receiver provides -85 dBm receiver sensitivity
• Drive capability to power external optoelectronics • Single monolithic bulk CMOS device providing low cost and
high availability of manufacturing supply
• ROM-based design eliminates external flash memories
• Flash option offered to support feature development
• Fully integrated low dropout (LDO) regulator provides APPLICATIONS
direction interface to batteries
• Integrated switching regulator to support external sensor and
more to further reduce BOM cost • Bluetooth mouse • Remote control HID devices
• Available in 88-pin fpBGA and 120-pin fpBGA packages • Bluetooth keyboard • Game controllers
• Combination mouse/keyboard
BCM2042 Functional Block Diagram
108 KB 22 KB 20 KB Processing Switching Battery
ROM RAM Boot ROM Unit Regulator 2.7V to 3.3V
System Bus
RF Control
and Data
Bluetooth GPIO for Keyboard 3-Axis
2.4 GHz
Baseband LEDs, LCD, Matrix Mouse
Radio
Core Power, etc. Scanner Signal Decoder
RF I/O T/R Frequency Power
Switch Synthesizer Management
XTAL GPIO Scan Quadrature
Matrix Inputs
OVERVIEW
Power Control for LEDs
and Sensors
Quad. Sensors LEDs
X-axis
Key Scan
Y-axis Matrix
Scroll
BCM2042
BCM2042
Indicators
Left
CAPS NUM SCROLL
Middle/Scroll
Right
BCM2042 Mouse Block Diagram BCM2042 Keyboard Block Diagram
The BCM2042 is a major breakthrough in the design of low-cost The Bluetooth baseband core has been optimized to maximize the battery
Bluetooth mouse and keyboard devices. The BCM2042 is a true single life and functionality required for a mouse or keyboard application.
chip that integrates the entire profile, application, and Bluetooth protocol Battery life has been optimized in the BCM2042 to meet greater than 6
stack and is fully compliant with the Bluetooth SIG specification for months for the typical user using standard battery technology.
human interface devices. The BCM2042 is fully compliant with the
The BCM2042 integrates a high-performance radio implemented in
version 2.0 Bluetooth specification, including adaptive frequency
standard bulk CMOS. It incorporates a proprietary self-calibrating VCO
hopping and fast connection, which are essential to mouse and keyboard
structure for both excellent phase noise and fast frequency hopping
applications in personal computers.
covering the entire band. All filters have been fully integrated into the
Integration is key to achieving the system cost targets of today's PC device and are also self-calibrating to automatically compensate for
OEMs. By integrating all components within today's mouse and changes in temperature and any process variation during manufacturing.
keyboard into the BCM2042, low system costs can be achieved to The RF interface to the device fully integrates the T/R switch and its
approach the price points of legacy-wired mice and keyboards. The associates matching circuits, enabling direct interface with the antenna.
BCM2042 can interface directly to mouse optical or ball encoders and
The block diagrams show how the BCM2042 can be used in either a
keyboard scan matrices.
mouse or keyboard application.
A key component enabling the BCM2042 to reach extremely low system
cost is the inclusion of a high-performance boost regulator. This enables
direct connect with mouse electronics requiring 3-volt operation without
adding expensive external components
Broadcom®, the pulse logo, Connecting everything®, and the Connecting everything logo are among the
trademarks of Broadcom Corporation and/or its affiliates in the United States, certain other countries and/
or the EU. Any other trademarks or trade names mentioned are the property of their respective owners.
Bluetooth® is a trademark owned by Bluetooth SIG.
BROADCOM CORPORATION Phone: 949-450-8700
16215 Alton Parkway, P.O. Box 57013 Fax: 949-450-8710
Irvine, California 92619-7013 E-mail: info@broadcom.com
© 2006 by BROADCOM CORPORATION. All rights reserved. Web: www.broadcom.com
2042-PB03-R 11/08/06
