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
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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
BOARDCOM [ Broadcom Corporation. ]
