Specifications

CY3280-SmartSense CapSense Auto-Tuning Kit Guide, Doc. # 001-64672 Rev. *A 11
Kit Operation
2.1.3 Power Sources
The board supports three power sources:
■ Internal supply (supplied AAA batteries to be placed in the battery holder)
■ External supply (pin#41, Header J2)
■ External supply (pin#1, Header J5)
Note To power the kit, at least one of the above sources should be active. The first two sources are
gated to capacitive touch controller by the Power button. The CapSense controller is powered
200 mV less than what is supplied to the board due to voltage drop across the power button switch
circuitry. External supply should be greater than 2.0 V and less than 3.8 V to get 1.71 V to 3.6 V sup-
ply on the CapSense controller.
Figure 2-3. Insert Battery in Batter Holder
2.1.4 Controller Pin Assignment
Pin assignment of the CapSense controller is shown in the following table. To learn how to assign
pins for your design, refer to the CY8C20246A data sheet.
Type Pin Description
BTN0 P1[3] CapSense Button 0
BTN1 P1[1] CapSense Button 1
BTN2 P1[0] CapSense Button 2
BTN3 P1[4] CapSense Button 3
LED0 P2[3] Active Low LED 0
LED1 P2[5] Active Low LED 1
LED2 P0[1] Active Low LED 2
LED3 P0[7] Active Low LED 3
CMOD P0[3] CSD Modulation Capacitor
ISSP-SDA P1[0] ISSP - Data Line
ISSP-SCL P1[1] ISSP - Clock Line
Align polarity