Cypress CapSense CY3280-SmartSense, Руководство к набору

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10 CY3280-SmartSense CapSense Auto-Tuning Kit Guide, Doc. # 001-64672 Rev. *B
Kit Operation
2.1 CY3280-SmartSense Kit Board
2.1.1 Board Features
■
Four CapSense buttons of different dimensions
■
Four LEDs connected to general purpose output pins
■
CapSense based power button and power LED
■
Operates from external power supply and battery
■
Expansion slots, allowing I/O to expand to external boards
2.1.2 System Block Diagram
Figure 2-2 shows the block diagram of the CY3280-SmartSense kit.
The kit can be powered from three different sources. Internal supply from on-board battery and
external supply through J2 connector are gated using a series pass switch controlled by the
CapSense based power button. Protection diodes are placed to avoid accidental short between the
two power sources. External supply through J5 connector is directly fed to CapSense controller.
Four CapSense buttons and LEDs are connected to the CapSense controller and are used for dem-
onstration purpose. Unused I/Os from CapSense controller are routed to expansion headers J1 and
J2 for debugging and development purpose.
Figure 2-2. Block Diagram of CY3280-SmartSense kit
CapSense Controller
(CY8C20246A)
On Board
Battery Supply
External Power
Supply through
Connector J2
Short Circuit
Protection
Series Pass
Switch
CapSense Power
Button
(CY8CMBR2044)
Four
CapSense
Buttons
Power
LED
Four Output
LEDs
External Power
Supply through
Connector J5
ISSP Connector
J5
Control Signal (Enable/Disable)