Cypress Semiconductor CapSense CY8CKIT-024, Manual, Page: 18 / 29

Kit Hardware
CY8CKIT-024 CapSense
®
Proximity Shield Kit Guide, Doc. No. 001-92568 Rev. *B 18
2.3.3 Hatch Pattern
A hatch pattern is provided on the bottom layer of the board, as Figure 2-10 shows. This hatch pattern may either be
connected to ground or to the driven shield pin on the kit using Slide Switch SW1 . Driving the hatch pattern with the shield
signal provides a larger proximity-sensing distance than grounding the hatch.
Figure 2-10: Hatch Pattern on Bottom Layer of Board
Hatch Pattern
2.3.4 Slide Switch SW1
The GND/SHIELD loop on the top layer and the hatch pattern on the bottom layer are connected to a slide switch, SW1, as
Figure 2-11 shows. This switch allows these patterns to be connected either to ground or the driven shield pin on the kit.
Driving the hatch with the shield signal provides a larger proximity-sensing distance when compared to grounding the hatch.
You can use this switch to evaluate the effect of ground and driven shield on the proximity-sensing performance.
Figure 2-11: Slide Switch
Note : The baseboard ( CY8CKIT-040 or CY8CKIT-042 ) should be reset if the SW1 switch position on CY8CKIT-024 is
modified.
2.3.5 C
TANK
Capacitor
C
TANK
acts as the shield tank capacitor for increasing the drive strength on the shield pin. Figure 2-12 shows the C
TANK
connection to the J2 Arduino header.
Figure 2-12: C
TANK
Connection to J2 Arduino Header