AN66308 - CY8CMBR2044 CapSense® Design Guide, Doc. No. 001-66308 Rev. *F
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Glossary
AMUXBUS
Analog multiplexer bus available inside PSoC that helps to connect I/O pins with multiple internal analog
signals.
SmartSense™ Auto-Tuning
A CapSense algorithm that automatically sets sensing parameters for optimal performance after the
design phase and continuously compensates for system, manufacturing, and environmental changes.
Baseline
A value resulting from a firmware algorithm that estimates a trend in the Raw Count when there is no
human finger present on the sensor. The Baseline is less sensitive to sudden changes in the Raw Count
and provides a reference point for computing the Difference Count.
Button or Button Widget
A widget with an associated sensor that can report the active or inactive state (that is, only two states) of
the sensor. For example, it can detect the touch or no-touch state of a finger on the sensor.
Difference Count
The difference between Raw Count and Baseline. If the difference is negative, or if it is below Noise
Threshold, the Difference Count is always set to zero.
Capacitive Sensor
A conductor and substrate, such as a copper button on a printed circuit board (PCB), which reacts to a
touch or an approaching object with a change in capacitance.
CapSense
®
Cypress’s touch-sensing user interface solution. The industry’s No. 1 solution in sales by 4x over No. 2.
CapSense Mechanical Button Replacement (MBR)
Cypress’s configurable solution to upgrade mechanical buttons to capacitive buttons, requires minimal
engineering effort to configure the sensor parameters and does not require firmware development. These
devices include the CY8CMBR3XXX and CY8CMBR2XXX families.
Centroid or Centroid Position
A number indicating the finger position on a slider within the range given by the Slider Resolution. This
number is calculated by the CapSense centroid calculation algorithm.
Compensation IDAC
A programmable constant current source, which is used by CSD to compensate for excess sensor C
P
.
This IDAC is not controlled by the Sigma-Delta Modulator in the CSD block unlike the Modulation IDAC.
CSD
