O V E R V I E W
Power Control for LEDs
and Sensors
Quad. Sensors
LEDs
X-axis
Y-axis
Key Scan
Matrix
Scroll
BCM2042
BCM2042
Indicators
NUM
Left
CAPS
SCROLL
Middle/Scroll
Right
BCM2042 Mouse Block Diagram
BCM2042 Keyboard 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.
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.
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.
The block diagrams show how the BCM2042 can be used in either a
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.
®
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Irvine, California 92619-7013
Phone: 949-450-8700
Fax: 949-450-8710
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© 2006 by BROADCOM CORPORATION. All rights reserved.
2042-PB03-R
11/08/06
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