CAP1128 8 Channel Capacitive Touch Sensor with 2 LED Drivers Datasheet PRODUCT FEATURES General Description Applications 1 The CAP1128, which incorporates SMSCs RightTouch Desktop and Notebook PCs technology, is a multiple channel Capacitive Touch sensor LCD Monitors with multiple power LED drivers. It contains eight (8) Consumer Electronics individual capacitive touch sensor inputs with Appliances programmable sensitivity for use in touch sensor applications. Each sensor input automatically recalibrates Features to compensate for gradual environmental changes. Eight (8) Capacitive Touch Sensor Inputs Programmable sensitivity The CAP1128 also contains two (2) LED drivers that offer Automatic recalibration full-on / off, variable rate blinking, dimness controls, and Individual thresholds for each button breathing. Each of the LED drivers may be linked to one of the sensor inputs to be actuated when a touch is detected. Proximity Detection As well, each LED driver may be individually controlled via Multiple Button Pattern Detection a host controller. Calibrates for Parasitic Capacitance The CAP1128 includes Multiple Pattern Touch recognition Analog Filtering for System Noise Sources that allows the user to select a specific set of buttons to be Press and Hold feature for Volume-like Applications touched simultaneously. If this pattern is detected, then a Multiple Communication Interfaces 2 status bit is set and an interrupt generated. SMBus / I C compliant interface SMSC BC-Link interface Additionally, the CAP1128 includes circuitry and support for SPI communications enhanced sensor proximity detection. Pin selectable communications protocol and multiple The CAP1128 offers multiple power states operating at low 2 slave addresses (SMBus / I C only) quiescent currents. In the Standby state of operation, one Low Power Operation or more capacitive touch sensor inputs are active and all 5uA quiescent current in Deep Sleep LEDs may be used. If a touch is detected, it will wake the 50uA quiescent current in Standby (1 sensor input system using the WAKE/SPI MOSI pin. monitored) Deep Sleep is the lowest power state available, drawing Samples one or more channels in Standby 5uA (typical) of current. In this state, no sensor inputs are Two (2) LED Driver Outputs active. Driving the WAKE/SPI MOSI pin or communications Open Drain or Push-Pull will wake the device. 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 1. SMSC, the SMSC logo and RightTouch are registered trademarks Available in 20-pin 4mm x 4mm QFN RoHS compliant and the RightTouch logo is a trademark of Standard Microsystems package Corporation (SMSC). Block Diagram LED1 LED2 RESET VDD GND WAKE / SPI MOSI SPI CS SMCLK/ BC CLK / SPI CLK SMBus / SMDATA / BC DATA/ SPI MSIO / BC-Link / LED Driver, Breathe, SPI MISO Capacitive Touch Sensing Algorithm SPI Slave and Dimness control ALERT / BC IRQ Protocol ADDR COMM CS1 CS2 CS3 CS4 CS5 CS6 CS7 CS8 SMSC CAP1128 DATASHEET Revision 1.32 (01-05-12) 8 Channel Capacitive Touch Sensor with 2 LED Drivers Datasheet Ordering Information: ORDERING NUMBER PACKAGE FEATURES CAP1128-1-BP-TR 20-pin QFN 4mm x 4mm Eight capacitive touch sensor inputs, (Lead-free RoHS compliant) Two LED drivers, Dedicated Wake, Reset, SMBus / BC-Link / SPI interfaces Reel size is 4,000 pieces This product meets the halogen maximum concentration values per IEC61249-2-21 For RoHS compliance and environmental information, please visit www.smsc.com/rohs Please contact your SMSC sales representative for additional documentation related to this product such as application notes, anomaly sheets, and design guidelines. Copyright 2012 SMSC or its subsidiaries. All rights reserved. Circuit diagrams and other information relating to SMSC products are included as a means of illustrating typical applications. Consequently, complete information sufficient for construction purposes is not necessarily given. Although the information has been checked and is believed to be accurate, no responsibility is assumed for inaccuracies. SMSC reserves the right to make changes to specifications and product descriptions at any time without notice. Contact your local SMSC sales office to obtain the latest specifications before placing your product order. The provision of this information does not convey to the purchaser of the described semiconductor devices any licenses under any patent rights or other intellectual property rights of SMSC or others. All sales are expressly conditional on your agreement to the terms and conditions of the most recently dated version of SMSC s standard Terms of Sale Agreement dated before the date of your order (theTerms of Sale Agreemen). The product may contain design defects or errors known as anomalies which may cause the product s functions to deviate from published specifications. Anomaly sheets are available upon request. SMSC products are not designed, intended, authorized or warranted for use in any life support or other application where product failure could cause or contribute to personal injury or severe property damage. Any and all such uses without prior written approval of an Officer of SMSC and further testing and/or modification will be fully at the risk of the customer. Copies of this document or other SMSC literature, as well as the Terms of Sale Agreement, may be obtained by visiting SMSCs website at