CAP1028 _ BDTIC a Leading Distributor in China

CAP1028

Please consider this device

The CAP1028, which incorporates RightTouch® technology, 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 CAP1028 also contains two (2) 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 CAP1028 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, 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 active although all LEDs may be used. Driving the WAKE/SPI_MOSI pin or communications will wake the device.

Features

Eight (8) capacitive touch sensor inputs Programmable sensitivity Automatic recalibration Individual thresholds for each button
Programmable sensitivity
Automatic recalibration
Individual thresholds for each button
Flexible capacitive touch sense algorithm
Multiple communication interfaces SMBus/I2C compliant interface Microchip BC-Link interface SPI communications Pin selectable communications protocol and multiple slave addresses (SMBus/I2C only)
SMBus/I2C compliant interface
Microchip BC-Link interface
SPI communications
Pin selectable communications protocol and multiple slave addresses (SMBus/I2C only)
Low power operation 3 µA quiescent current in deep sleep Samples one or more channels in standby
3 µA quiescent current in deep sleep
Samples one or more channels in standby
Two (2) LED driver outputs Open drain or push-pull Programmable blink, breathe, and dimness controls Can be linked to capacitive touch sensors
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 20-pin 4mm x 4mm RoHS compliant QFN package
Desktop and Notebook PCs
LCD Monitors
Printers
Appliances

Parameter

Parameter Name Value	Value
Product Type Proximity/Keys/Slider	Proximity/Keys/Slider
Input Channels 8	8
Proximity detection Yes	Yes
Measurement Principle Self Capacitance	Self Capacitance
Power Modes 3	3
Interface I2C/SPI	I2C/SPI
I/O, LED Drivers 2	2
Voltage Range 3.0V - 3.6V	3.0V - 3.6V

Documents

AN18.15 - PCB Design Guidelines for QFN and DQFN Packages	AppNote	10/16/2014	205KB
AN19.16 - Physical Design and Layout Guidelines for Capacitive Sensor Systems	AppNote	04/25/2014	1496KB
CAP1028 8 Channel Capacitive Touch Sensor with 2 LED Drivers Data Brief	Product Briefs	11/26/2009	202KB