CAP1088 Datasheet, PDF (1/72 Pages) SMSC Corporation – 8 Channel Capacitive Touch Sensor with 8 LED Drivers

CAP1088
8 Channel Capacitive Touch
Sensor with 8 LED Drivers
PRODUCT FEATURES
Datasheet
General Description
The CAP1088 is a multiple channel Capacitive Touch
sensor with multiple power LED drivers. It contains eight
(8) individual Capacitive Touch sensor inputs with
programmable sensitivity for use in touch sensor
applications. Each sensor automatically recalibrates to
compensate for gradual environmental changes.
The CAP1088 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 sensors to be actuated when a touch is
detected. As well, each LED driver may be individually
controlled via a host controller.
The CAP1088 offers multiple power states operating at
low quiescent currents.
During the Standby mode of operation, one or more
Capacitive Touch Sensors are active and all LEDs may
be used. If a touch is detected, then it will wake the
system using the WAKE/SPI_MOSI pin.
The Deep Sleep mode of operation is the lowest power
state available drawing 3uA of current. During this
mode, no sensors are activethough all LEDs may be
used. Driving the WAKE/SPI_MOSI pin or
communications will wake the device.
Applications
„ Desktop and Notebook PC’s
„ LCD Monitors
„ Printers
„ Appliances
Features
„ Eight (8) Capacitive Touch Sensor Inputs
— Programmable sensitivity
— Automatic recalibration
— Individual thresholds for each button
„ Flexible Capacitive Touch Sense algorithm
„ 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
— 3uA quiescent current in Deep Sleep
— 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 Sensors
„ Dedicated Wake output flags touches in low power
mode
„ System RESET pin
„ Available in 24-pin 4mm x 4mm RoHS compliant
QFN package
Block Diagram
LED1 LED2 LED3 LED4
LED Driver, Breathe,
and Dimness control
RESET
VDD GND
Capacitive Sensing Algorithm
WAKE / SPI_MOSI
SMBus /
BC-Link
or SPI
Slave
Protocol
SPI_CS#
SMCLK / BC_CLK /
SPI_CLK
SMDATA / BC_DATA /
SPI_MSIO / SPI_MISO
ALERT# / BC_IRQ#
ADDR_COMM
LED5 LED6 LED7 LED8 CS1 CS2 CS3 CS4 CS5 CS6 CS7 CS8
Note: I²C is a trademark of NXP semiconductor. BC-Link is a trademark of SMSC.
SMSC CAP1088
DATASHEET
Revision 1.1 (08-05-09)