MTCH112 Dual-Channel Proximity/Touch Controller Features: Package Type Capacitive Proximity Detection System: The device is available in 8-lead SOIC and DFN - High Signal to Noise Ratio (SNR) packaging (see Figure 1). - Adjustable sensitivity - Noise Rejection Filters FIGURE 1: 8-PIN DIAGRAM - Scanning method actively optimized to FOR MTCH112 attenuate strongest noise frequencies SOIC, DFN - Automatic calibration with optional user presets - Dynamic threshold management adjusts sensitivity of sensor based on the level of VDD 1 VSS 8 environmental noise - Constant press calibration tracks the 2 MTI1/MTGRD0 MTO/INT 7 expected offset when the sensor is pressed and adjusts the threshold to automatically achieve the best press/release behavior MTI0 3 SCL 6 - User-defined minimum shift values specify the lowest amount of signal change to 4 RESET SDA 5 activate a state transition. Automatic thresholds never decrease below these settings. - Automatic Environmental Compensation - Stuck release mechanism No Required External Components TABLE 1: 8-PIN SOIC/DFN PINOUT Low-Power mode: Highly Configurable DESCRIPTION Low-Power mode 8-Pin - 1 ms to 4s Sleep interval between sensor I/O Description SOIC/DFN samples Response Time as Low as 10 ms VDD 1 Power Supply Input Hardware Error Detection notifies if either sensor MTO/INT 2 Detect Output (Active-Low) is shorted to VDD, VSS or the other sensor Notification Interrupt Pin Operating Voltage Range: MTI0 3 Proximity/Touch Sensor Input - 1.8V to 3.3V RESET 4 Device Reset (Active-Low) Operating Temperature: 2 - 40C to +85C SDA 5 I C Data 2 SCL 6 I C Clock MTI1/MTGRD0 7 Proximity/Touch Sensor Input Active Guard Shield for MTI0 VSS 8 Ground Reference 2012 Microchip Technology Inc. Preliminary DS41668A-page 1 MTCH112MTCH112 Table of Contents 1.0 Device Overview........................................................................................................................................................................ 3 2 2.0 I C Serial Interface ................................................................................................................................................................. 6 3.0 Configuration Registers ........................................................................................................................................................... 13 4.0 Electrical Characteristics.......................................................................................................................................................... 25 5.0 Packaging Information ............................................................................................................................................................. 34 Index ................................................................................................................................................................................................. 42 The Microchip Web Site ....................................................................................................................................................................... 43 Customer Change Notification Service ................................................................................................................................................ 43 Customer Support................................................................................................................................................................................ 43 Reader Response ................................................................................................................................................................................ 44 Product Identification System .............................................................................................................................................................. 45 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 or fax the Reader Response Form in the back of this data sheet to (480) 792-4150. 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: