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CY3280-MBR2 CapSense Express with SmartSense Auto-Tuning Kit Guide, Doc. # 001-71857 Rev. *C
Kit Operation
3.2
Kit Features
The following sections demonstrate each feature of this device.
3.2.1
SmartSense Auto-Tuning
The CY8CMBR2110 CapSense controller is built with a robust CSD capacitive sensing method and
patented SmartSense auto-tuning algorithm. SmartSense Auto-Tuning tunes each sensor
automatically at power up; it then monitors and maintains optimum sensor performance during run
time. This technology adapts for manufacturing variation in PCBs, environmental conditions, and
noise sources such as LCD inverters, AC line noise, and switch-mode power supplies, and
automatically tunes them out.
SmartSense auto-tuning feature does not need to be enabled using EZ-Click and is automatically
enabled on power-up. This feature can be verified on all the buttons, which are enabled. This kit is
pre-loaded with Sample Configuration1, which supports 10 buttons and all 10 buttons demonstrates
SmartSense by default.
This feature is demonstrated as follows.
1. Ensure that the Power select switch is in BAT position. Power the kit by touching the Power but-
ton.
2. Touch any button and observe that the respective LED lights up without any manual tuning.
3. Power off the kit. Connect the Flex-PCB and then power the kit. When there is a finger touch on
the Flex-PCB, the respective LED on the kit lights up without any tuning. The change in sensor
parasitic capacitance (Cp) due to the Flex-PCB and the overlay is auto tuned by the SmartSense
Auto-Tuning algorithm. Hence, no manual tuning is required.
4. Flex-PCB has a 1 mm overlay pasted on top of it. You can also use the 3 mm overlay provided
with the kit on top of 1mm overlay in the same way as explained above to verify SmartSense
auto-tuning feature.
Notes
■
Button 2, Left, and Up navigation buttons on the Flex-PCB may not work with 4 mm overlay
(1 mm + 3 mm). The loss of sensitivity of these buttons is due to the overlay thickness and
small size of these buttons. To find the required button diameter for particular overlay thinness,
refer to the
.
■
It is recommended not to use the buttons on the main kit while the Flex-PCB is connected to
the kit.
■
The exposed Flex-PCB header pins should not be touched while the kit is powered ON.
Touching these pins can act as adding the required finger capacitance. This will lead to false
triggers.
■
The Flex-PCB is for demonstrating SmartSense Auto-tuning feature and cannot be used for
your product design.
