Datasheet

CY8CMBR3002, CY8CMBR3102
CY8CMBR3106S, CY8CMBR3108
CY8CMBR3110, CY8CMBR3116 Datasheet
Document Number: 001-85330 Rev. *G Page 35 of 37
Glossary
Reference Documents
C
P
Parasitic capacitance.
EZ-Click The customizer tool (GUI) that enables easy register configurability and debugging for the
CY8CMBR3xxx family of controllers.
GPO General Purpose Output – that is, an output pin on a chip that the user can configure.
FSS Flanking Sensor Suppression. An algorithm that distinguishes between signals from closely spaced
buttons, eliminating false touches. It ensures that the system recognizes only the first button touched.
SmartSense Cypress CapSense algorithm that continuously compensates for system, manufacturing, and
environmental changes.
SNR A ratio of the sensor signal, when touched, to the noise signal of an untouched sensor.
Toggle An MBR device feature that toggles the state of GPOs on every sensor activation.
Open-Drain Low-Drive
mode
An output pin drive mode wherein logic 0 is represented by a low voltage (that is, Voltage < V
OL
), whereas
logic 1 is represented by floating the output line to a HIGH impedance state.
Strong Drive mode An output pin drive mode where logic 0 is represented by a low voltage (that is, Voltage < V
OL
), whereas
logic 1 is represented by a high voltage (that is, Voltage V > V
OH
).
Raw counts A count value representing a digital count equivalent of sensed capacitance.
Baseline A filtered version of the raw counts. The baseline essentially tracks the value of the parasitic capacitance
in the system but does not track the value of the finger capacitance.
Parasitic capacitance The intrinsic capacitance of PC board traces to sensors.
Finger capacitance Additional capacitance introduced on a CapSense sensor when a finger approaches/touches the sensor.
Global setting A setting value that is common for all elements of a set.
Active LOW signal A signal that indicates the active state by logic 0 and the inactive state by logic 1 values.
Active HIGH signal A signal that indicates the active state by logic 1 and the inactive state by logic 0 values.
Document Title Description
CapSense CY8CMBR3xxx Design Guide Provides design guidance for using capacitive touch sensing (CapSense) function-
ality with the CY8CMBR3xxx family of CapSense controllers.
Getting Started with CapSense® Provides a starting point for anyone who is new to capacitive touch sensing
(CapSense) and for anyone learning key design considerations and layout best
practices.
Design Toolbox Includes four sections – General Layout Guidelines for a CapSense PCB, a layout
estimator for estimating button dimensions, a power consumption calculator (based
on button dimensions), and the Design Validation tool to validate the layout design.
EZ-Click User Guide Gives instructions on how to install and uninstall the EZ-Click Customizer tool and
describes how to set up the boards. It also includes detailed descriptions of all the
tabs in the GUI.
CY8CMBR3xxx Programming Specifications Gives the information necessary to program the nonvolatile memory of the
CY8CMBR3xxx devices. It describes the communication protocol required for
access by an external programmer, explains the programming algorithm, and gives
electrical specifications of the physical connection.
CapSense® Express™ Controllers Registers
TRM
Lists and details all registers of CY8CMBR3102, CY8CMBR3106S,
CY8CMBR3108, CY8CMBR3110, and CY8CMBR3116 CapSense
®
Express™
controllers. All registers are listed in the order of address.