BCM2042
®
SINGLE-CHIP BLUETOOTH
®
MOUSE AND KEYBOARD
FEATURES
•
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
•
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
SUMMARY OF BENEFITS
•
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
•
•
•
•
•
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
•
APPLICATIONS
•
Bluetooth mouse
•
Remote control HID devices
•
Bluetooth keyboard
•
Game controllers
•
Combination mouse/keyboard
BCM2042 Functional Block Diagram
108 KB
ROM
22 KB
RAM
20 KB
Boot ROM
Processing
Unit
Switching
Regulator
Battery
2.7V to 3.3V
System Bus
RF Control
and Data
2.4 GHz
Radio
Bluetooth
Baseband
Core
GPIO for
LEDs, LCD,
Power, etc.
Keyboard
Matrix
Scanner
3-Axis
Mouse
Signal Decoder
RF I/O
T/R
Switch
Frequency
Synthesizer
Power
Management
XTAL
GPIO
Scan
Matrix
Quadrature
Inputs
OVERVIEW
Power Control for LEDs
and Sensors
Quad. Sensors
LEDs
X-axis
Y-axis
Key Scan
Matrix
Scroll
BCM2042
BCM2042
Indicators
Left
CAPS
NUM
SCROLL
Middle/Scroll
Right
BCM2042 Mouse Block Diagram
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 specification, 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.
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
BCM2042 Keyboard Block Diagram
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-calibrating 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.
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
16215 Alton Parkway, P.O. Box 57013
Irvine, California 92619-7013
© 2006 by BROADCOM CORPORATION. All rights reserved.
2042-PB03-R
11/08/06
Phone: 949-450-8700
Fax: 949-450-8710
E-mail: info@broadcom.com
Web: www.broadcom.com
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