AN66308 - CY8CMBR2044 CapSense® Design Guide, Doc. No. 001-66308 Rev. *F
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3. CapSense Schematic Design
CY8CMBR2044 Configuration Options
Cypress’s CY8CMBR2044 enables you to implement capacitive touch sensing using only hardware. This section
provides an overview of the CapSense controller pins and how to configure them.
Figure 3-1. CY8CMBR2044 Pin Diagram
CapSense Buttons (CSx)
The CY8CMBR2044 controller has four capacitive sense inputs, CS0
–CS3. Each capacitive button requires a
connection to one of the capacitive sense inputs. You must ground all unused CapSense (CSx) inputs pins.
General-Purpose Outputs (GPOx)
There are four active LOW outputs on the CY8CMBR2044 controller, GPO0
–GPO3. Each output, GPOx, is driven by
its corresponding capacitive sensing input, CSx. You can use GPOs to directly drive LEDs or to replace mechanical
switches. GPOs are in strong drive
a
mode. You must leave all unused GPOs floating.
Modulation Capacitor (C
MOD
)
Connect a 2.2-nF (±10%) capacitor to the C
MOD
pin.
a
When a pin is in strong drive mode, it is pulled up to V
DD
when the output is HIGH and pulled down to Ground when the output is
LOW. The output cannot be floating.
