User manual

CY3280-MBR3 Evaluation Kit User Guide, Doc. #: 001-89905 Rev. *B 61
Configuration Files and Example Projects
Figure 5-18. Verify Water Tolerance - With Finger
Note: The board does not have a guard sensor loop and cannot detect false touches in streaming
water conditions. Therefore, while testing the board for water tolerance failure, ensure that the water
droplets placed on one CapSense button do not come in contact with water droplets placed on
another CapSense button.
Note: If the liquid in the dropper has significant conductivity, false touch may occur when the dropper
touches the overlay on the board. This is not observed with clean water.
Water Tolerance Failure Demonstration: In the existing Water Tolerance configuration, uncheck the
Enable Shield check box in the Global Configuration tab.
Figure 5-19. Water Tolerance Failure Demonstration
Now, click the 'Generate Config File' icon to generate the configuration; apply it to the board by click-
ing the 'Apply Current Config File’ icon.
Press the reset switch, SW2, on the board and place water droplets on the CapSense button using
the water dropper; observe that the LED turns on as if the button has been touched.
Note: The MBR3 SmartSense algorithm constantly updates baseline measurements, which may
compensate for small droplets of water such that water tolerance failure is not observed. Therefore,
a sufficient volume of water (one full dropper) is required to demonstrate water tolerance failure with-
out the shield enabled.