CY8CMBR2044_12 Datasheet, PDF (1/29 Pages) Cypress Semiconductor – Four Button CapSense® Controller

CY8CMBR2044
Four Button CapSense^® Controller
Four Button CapSense® Controller
Features
■ Easy to use capacitive button controller
❐ Four-button solution configurable through Hardware straps
❐ No software tools or programming required
❐ Four general-purpose outputs (GPOs)
❐ GPOs linked to CapSense^® buttons
❐ GPOs support direct LED drive
■ Robust noise performance
❐ Specifically designed for superior noise immunity to external
radiated and conducted noise
❐ Low radiated noise emission
■ SmartSense™ Auto-Tuning
❐ Saves time and effort in device tuning
❐ CapSense parameters dynamically set in runtime
❐ Maintains optimal button performance even in
environment
noisy
❐ Wide parasitic capacitance C_P range (5 pF–40 pF)
■ System Diagnostics of CapSense buttons - reports any faults
at device power up
❐ Button shorted to Ground
❐ Button shorted to V_DD
❐ Button to button short
❐ Improper value of modulator capacitor (C_MOD)
❐ Parasitic capacitance (C_P) out of range
■ Advanced features
❐ Toggle ON/OFF feature on GPOs
❐ Flanking Sensor Suppression (FSS) provides robust sensing
even with closely spaced buttons
❐ Configurable LED ON time after button release
❐ Button output reset if touched for excessive time
❐ User-controlled Button Scan Rate
❐ Serial Debug Data output
• Simplifies production line testing and system debug
■ Wide operating voltage range
❐ 1.71 V to 5.5 V – ideal for both regulated and unregulated
battery applications
■ Low power consumption
❐ Supply current in run mode as low as 15 µA^[1] per button
❐ Deep sleep current: 100 nA
■ Industrial temperature range: –40 °C to + 85 °C
■ 16-pad quad flat no leads (QFN) package
(3 mm × 3 mm × 0.6 mm)
Overview
The CY8CMBR2044 incorporates several innovative features to
save time and money to quickly enable a capacitive touch
sensing user interface in your design. It is a hardware
configurable device and does not require any software tools or
coding. This device is enabled with Cypress's revolutionary
SmartSense™ Auto-Tuning algorithm. SmartSense™
Auto-Tuning ends the need to manually tune the user interface
during development and production ramp. This speeds the time
to volume and saves valuable engineering time, test time and
production yield loss.
The CY8CMBR2044 CapSense controller supports up to four
capacitive touch sensing buttons and four General Purpose
Outputs (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 applications. The wide
operating range of 1.71 V to 5.5 V enables unregulated battery
operation, further saving component cost. Also, the same device
can be used in different applications with different power
supplies, including low power supplies.
This device supports ultra low-power consumption in both run
mode and deep sleep mode to stretch battery life. In addition,
this device also supports many advanced features which
enhance the robustness and user interface of the end solution.
Some of the key advanced features include Noise Immunity and
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.
Serial Debug Data output gives the critical information about the
design, such as button Cp and Signal-to-Noise Ratio (SNR). This
further helps in production line testing.
Note
1. Power consumption calculated with 1.7% touch time, 500 ms scan rate, and C_P of each sensor < 19 pF.
Cypress Semiconductor Corporation • 198 Champion Court
Document Number: 001-57451 Rev. *E
• San Jose, CA 95134-1709 • 408-943-2600
Revised May 22, 2012