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CAP1188-1-CP-TR Datenblatt(PDF) 1 Page - Microchip Technology

Teilenummer CAP1188-1-CP-TR
Bauteilbeschribung  8 Channel Capacitive Touch Sensor with 8 LED Drivers
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SMSC CAP1188
DATASHEET
Revision 1.32 (01-05-12)
Datasheet
PRODUCT FEATURES
CAP1188
8 Channel Capacitive Touch Sensor
with 8 LED Drivers
General Description
The CAP1188, which incorporates SMSC’s RightTouch® 1
technology, is a multiple channel Capacitive Touch sensor
with multiple power LED drivers. It contains eight (8)
ind i v i du al c a p a c i tiv e tou c h se ns or in put s with
programmable sensitivity for use in touch sensor
applications. Each sensor input automatically recalibrates
to compensate for gradual environmental changes.
The CAP1188 also contains eight (8) 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 CAP1188 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 CAP1188 includes circuitry and support for
enhanced sensor proximity detection.
The CAP1188 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. If a touch is detected, it will wake the
system using the WAKE/SPI_MOSI pin.
Deep Sleep is the lowest power state available, drawing
5uA (typical) of current. In this state, no sensor inputs are
active. Driving the WAKE/SPI_MOSI pin or communications
will wake the device.
Applications
Desktop and Notebook PCs
LCD Monitors
Consumer Electronics
Appliances
Features
Eight (8) 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
Multiple Communication Interfaces
—SMBus / I2C compliant interface
SMSC BC-Link interface
SPI communications
Pin selectable communications protocol and multiple
slave addresses (SMBus / I2C only)
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
Eight (8) LED Driver Outputs
Open Drain or Push-Pull
Programmable blink, breathe, and dimness controls
Can be linked to Capacitive Touch Sensor inputs
Dedicated Wake output flags touches in low power state
System RESET pin
Available in 24-pin 4mm x 4mm RoHS compliant QFN
package
Block Diagram
1. SMSC, the SMSC logo and RightTouch are registered trademarks
and the RightTouch logo is a trademark of Standard Microsystems
Corporation (“SMSC”).
SMBus /
BC-Link or
SPI Slave
Protocol
SMCLK / BC_CLK /
SPI_CLK
SMDATA / BC_DATA / SPI_MSIO /
SPI_MISO
VDD
ALERT# / BC_IRQ#
Capacitive Touch Sensing Algorithm
LED1
CS1
CS2
CS3
CS4
CS5
CS6
LED Driver, Breathe, and
Dimness control
WAKE / SPI_MOSI
CS7
CS8
RESET
ADDR_COMM
SPI_CS#
LED2 LED3 LED4
LED5 LED6 LED7 LED8
GND


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