CAP1298 8-Channel Capacitive Touch Sensor Controller with Proximity Detection & Signal Guard General Description Applications The CAP1298 is a multiple channel capacitive touch Desktop and Notebook PCs sensor controller. It contains eight (8) individual capac- LCD Monitors itive touch sensor inputs with programmable sensitivity Consumer Electronics for use in touch sensor applications. Each sensor input Appliances is calibrated to compensate for system parasitic capac- itance and automatically recalibrated to compensate Features for gradual environmental changes. In addition, the CAP1298 can be configured to detect Eight (8) Capacitive Touch Sensor Inputs proximity on one or more channels with an optional sig- - Programmable sensitivity nal guard to reduce noise sensitivity and to isolate the - Automatic recalibration proximity antenna from nearby conductive surfaces - Calibrates for parasitic capacitance that would otherwise attenuate the e-field. - Individual thresholds for each button The CAP1298 includes Multiple Pattern Touch recogni- Proximity Detection tion that allows the user to select a specific set of but- Signal Guard tons to be touched simultaneously. If this pattern is - Isolates the proximity antenna from attenua- detected, a status bit is set and an interrupt is gener- ated. tion - Reduces system noise sensitivity effects on The CAP1298 has Active and Standby states, each inputs with its own sensor input configuration controls. The Multiple Button Pattern Detection Combo state allows a combination of sensor input con- trols to be used which enables one or more sensor Power Button Support inputs to operate as buttons while another sensor input Press and Hold Feature for Volume-like Applica- is operating as a proximity detector. Power consump- tions tion in the Standby and Combo states is dependent on 3.3V or 5V Supply the number of sensor inputs enabled as well as averag- Analog Filtering for System Noise Sources ing, sampling time, and cycle time. Deep Sleep is the RF Detection and Avoidance Filters lowest power state available, drawing 5A (typical) of current. In this state, no sensor inputs are active, and Digital EMI Blocker communications will wake the device. 8kV ESD Rating on All Pins (HBM) Low Power Operation - 5A quiescent current in Deep Sleep - 50A quiescent current in Standby (1 sensor input monitored) - Samples one or more channels in Standby 2 C Compliant Communication Interface SMBus / I Available in a 16-pin 3mm x 3mm QFN RoHS compliant package Available in a 14-pin SOIC RoHS compliant pack- age 2013-2015 Microchip Technology Inc. DS00001571B-page 1CAP1298 TO OUR VALUED CUSTOMERS It is our intention to provide our valued customers with the best documentation possible to ensure successful use of your Microchip products. To this end, we will continue to improve our publications to better suit your needs. Our publications will be refined and enhanced as new volumes and updates are introduced. If you have any questions or comments regarding this publication, please contact the Marketing Communications Department via E-mail at docerrors microchip.com. We welcome your feedback. Most Current Data Sheet To obtain the most up-to-date version of this data sheet, please register at our Worldwide Web site at: