CAP1133
3 Channel Capacitive Touch Sensor
with 3 LED Drivers
PRODUCT FEATURES
General Description
The CAP1133, which incorporates SMSC’s RightTouch
®
1
technology, is a multiple channel Capacitive Touch sensor
with multiple power LED drivers. It contains three (3)
individual capacitive touch sensor inputs with
programmable sensitivity for use in touch sensor
applications. Each sensor input automatically recalibrates
to compensate for gradual environmental changes.
The CAP1133 also contains three (3) LED drivers that offer
full-on / off, variable rate blinking, dimness controls, and
breathing. Each of the LED drivers may be linked to one of
the sensor inputs to be actuated when a touch is detected.
As well, each LED driver may be individually controlled via
a host controller.
The CAP1133 includes Multiple Pattern Touch recognition
that allows the user to select a specific set of buttons to be
touched simultaneously. If this pattern is detected, then a
status bit is set and an interrupt generated.
Additionally, the CAP1133 includes circuitry and support for
enhanced sensor proximity detection.
The CAP1133 offers multiple power states operating at low
quiescent currents. In the Standby state of operation, one
or more capacitive touch sensor inputs are active and all
LEDs may be used.
Deep Sleep is the lowest power state available, drawing
5uA (typical) of current. In this state, no sensor inputs are
active. Communications will wake the device.
1. SMSC, the SMSC logo and RightTouch are registered trademarks
and the RightTouch logo is a trademark of Standard Microsystems
Corporation (“SMSC”).
Datasheet
Applications
Desktop and Notebook PCs
LCD Monitors
Consumer Electronics
Appliances
Features
Three (3) Capacitive Touch Sensor Inputs
— Programmable sensitivity
— Automatic recalibration
— Individual thresholds for each button
Proximity Detection
Multiple Button Pattern Detection
Calibrates for Parasitic Capacitance
Analog Filtering for System Noise Sources
Press and Hold feature for Volume-like Applications
SMBus / I
2
C Compliant Communication Interface
Low Power Operation
— 5uA quiescent current in Deep Sleep
— 50uA quiescent current in Standby (1 sensor input
monitored)
— Samples one or more channels in Standby
Three (3) LED Driver Outputs
— Open Drain or Push-Pull
— Programmable blink, breathe, and dimness controls
— Can be linked to Capacitive Touch Sensor inputs
Available in 10-pin 3mm x 3mm RoHS compliant DFN
package
Block Diagram
LED1
LED2
LED3
VDD
GND
SMCLK
LED Driver, Breathe, and
Dimness control
Capacitive Touch Sensing
Algorithm
SMBus
Slave
Protocol
SMDATA
ALERT#
CS1
CS2
CS3
SMSC CAP1133
DATASHEET
Revision 1.32 (01-05-12)
SMSC [ SMSC CORPORATION ]
