PSoC™ 6 Wi-Fi Bluetooth® pioneer kit guide, Document Number. 002-22677 Rev. *I
49
Hardware
3.3.4
CAPSENSE™ shield
The hatched pattern around the CAPSENSE™ buttons and slider are connected to ground. If liquid
tolerance is required, this pattern needs to be connected to the shield pin. This pattern can be
connected to either of the two ports P6.3 or P13.6 populated by R145 or R45, respectively. In both
cases, resistor R44 connecting the hatched pattern to ground needs to be removed.
Connecting the hatched pattern to shield instead of ground will also reduce the parasitic capacitance
of the sensors.
3.3.5
CSH
The shield tank capacitor (CSH) is not populated by default. This capacitor is optional, and can be
used for an improved shield electrode driver when CSD sensing is used. You can remove R146 to
disconnect port 7.3 from header and populate C29 (10 nF) for CSH. See the bill of material (BOM)
for the recommended part number.
Figure 3-12. Schematics of CAPSENSE™ shield and CSH
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