Ten-button solution configurable through I C protocol
❐
Ten general purpose outputs (GPOs)
❐
GPOs are linked to CapSense buttons
❐
GPOs support direct LED drive
Low power consumption
[1]
❐
Supply current in run mode as low as 23 µA for each button
❐
Deep sleep current: 100 nA
Industrial temperature range: –40 °C to +85 °C
32-pin Quad Flat No-leads (QFN) package
(5 mm × 5 mm × 0.6 mm)
■
■
SmartSense™ Auto-Tuning
❐
Maintains optimal button performance even in noisy
environment
❐
CapSense parameters dynamically set in runtime
❐
Saves time and effort in device tuning
❐
Wide parasitic capacitance (C
P
) range (5 pF–40 pF)
■
Advanced features
❐
Robust sensing even with closely-spaced buttons – Flanking
Sensor Suppression (FSS)
❐
User-configurable LED effects
• On-system power-on
• On-button touch
• LED ON Time after button release
• Standby Mode LED Brightness
❐
Buzzer Signal Output
❐
Supports analog voltage output (requires external resistors)
❐
Attention line interrupt to host to indicate any CapSense but-
ton status change
2
❐
CapSense performance data through I C interface
❐
Simplifies production-line testing and system debug
■
Noise Immunity
❐
Specifically designed for superior noise immunity to external
radiated and conducted noise
❐
Low radiated noise emission
■
System diagnostics of CapSense buttons – reports faults at
device power-up
❐
Button shorts
❐
Improper value of modulating capacitor (C
MOD
)
❐
Parasitic capacitance (C
P
) value out of range
■
■
Overview
The CY8CMBR2110 CapSense Express™ capacitive touch
sensing controller saves time and money, quickly enabling a
capacitive touch sensing user interface in your design. It is a
register-configurable device and does not require any firmware
coding or device programming. In addition, this device is enabled
with Cypress’s SmartSense Auto-Tuning algorithm which elimi-
nates the need to manually tune the user interface during devel-
opment and production ramp. This speeds the time to volume
and saves valuable engineering time, test time, and production
yield loss.
The EZ-Click Customizer tool is a simple graphical interface for
configuring the device features, through the I
2
C interface. One
configuration can be used to configure multiple samples in
different boards.
The CY8CMBR2110 CapSense controller supports up to ten
capacitive sensing buttons and ten GPOs. The GPO is an active
low output controlled directly by the CapSense input making it
ideal for a wide variety of consumer, industrial, and medical appli-
cations. The wide operating range of 1.71 V to 5.5 V enables
unregulated battery operation, further saving component cost.
The same device can also be used in different applications with
varying power supplies.
This device supports ultra low-power consumption in both run
mode and deep sleep modes to stretch battery life. In addition,
this device also supports many advanced features, which
enhance the robustness and user experience of the end solution.
The key advanced features are Noise Immunity and Flanking
Sensor Suppression (FSS). Noise Immunity improves the
immunity of the device against radiated and conducted noise,
such as audio and radio frequency (RF) noise. FSS provides
robust sensing even with closely-spaced buttons. FSS is a
critical requirement in small form-factor applications.
Power-on LED effects provide visual feedback to the design at
system power-on. Button-controlled LED effects provide visual
feedback on a button touch. These effects improve the aesthetic
value of the end product. Buzzer Signal Output provides audio
feedback on a button touch. System diagnostics test for design
faults at power-on and report any failures. This simplifies
production-line testing and reduces manufacturing costs.
CapSense data output through I
2
C gives critical information
about the design, such as button C
P
and signal-to-noise ratio
(SNR). This further helps in system debug and production-line
testing.
EZ-Click™ Customizer tool
❐
Simple graphical configuration options
❐
Dynamically configures all features
❐
Configurations can be saved and reused later
I
2
C interface
❐
No clock stretching
❐
Supports speed of up to 100 kHz
Wide operating voltage range
❐
1.71 V to 5.5 V – ideal for both regulated and unregulated
battery applications
■
■
Note
1. 23 µA per button (4 buttons used, 180 button touch per hour, average button touch time of 1000 ms, buzzer disabled, Button Touch LED Effects disabled, 10 pF < C
P
of all buttons < 20 pF, Button Scan Rate = 541 ms, with power consumption optimized, Noise Immunity level Normal, CSx sensitivity Medium).
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