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CY4636 WirelessUSB™ LP Keyboard Mouse Reference Design Kit User Guide, Doc. # 001-70355 Rev. *A
Hardware
Figure 4-19. Schematic View of the Power Supply System Structure for the Mouse board
4.3
Keyboard
The CY4636 WirelessUSB™ LP Keyboard-Mouse Reference Design Kit uses a enCoRe II LV controller for the
RDK keyboard. The architecture is designed to be modular for extendibility and maintainability. It is also
designed so that it can easily be ported from one hardware platform to another assuming the use of an enCoRe
II LV microprocessor. While porting to another microprocessor requires more work, the hardware design was
done to minimize usage of advanced enCoRe II LV features to expedite this effort.
Design efforts have reduced the ‘ON’ time of the microprocessor and radio to conserve battery life. This
includes protocol optimizations along with using sleep features of the radio and enCoRe II LV microprocessor.
The keyboard design uses the BAT400D-7-F schottky diode (D1) and CDH53100LC inductor (L3) for its boost
circuitry. These low cost components are used to reduce the overall system cost at the expense of lower boost
efficiency. Preliminary characterization data shows a range of 68 to 81% efficiency for the 1.8-2.7 V VBAT volt-
age range at different temperatures (-–10 °C to 80 °C). Higher efficiency components such as the ones in the
mouse design may be used at the expense of component costs and board size (these low cost components are
smaller in size compared to those used in the mouse design.)
Figure 4-20. Keyboard Block Diagram
Chip
CY7C60123
Chip CYRF6936
Radio
Battery Power
Supply
Bind Button
Keyboard
Interface
ISSP Header
Antenna