CY3280-MBR CapSense Express with SmartSense Auto-Tuning Kit Guide, Doc. # 001-64772 Rev. **
21
Kit Features
3.7.3
Test CapSense Buttons with Sleep Feature Enabled
Touch any CapSense button; the respective LED turns on. When the finger is released, the LED
turns off. There is no visible difference, but the CY8CMBR2044 CapSense controller is now working
at lower average power. To test the average current consumed by the CapSense controller, desolder
the R7 resistor and connect an ammeter in its place. Removing the R7 resistor allows to measure
the current consumed by the CapSense controller without including the current consumed by other
circuits such as LEDs. The ammeter shows the average power consumed by the CapSense
controller. As the potentiometer is turned more towards the left, the average power continues to
reduce.
Figure 3-16. Setup to Measure Average Current
3.8
ARST Feature
The following steps demonstrate the auto reset (ARST) feature of CY8CMBR2044 CapSense
controller using CY3280-MBR kit. Before proceeding, power the kit in default mode using the
procedure provided in the section
3.8.1
Enable ARST Feature
The ARST feature is enabled in this kit by default. The 5.1-K resistor connected to ARST port pin
and ground configures the sensor auto reset time to 20 seconds. No change is needed in the kit to
enable the ARST feature.
Figure 3-17. Resistor Connected to ARST
External Resistor
