Proximity Capacitive Touch Sensor Controller - Freescale - #1

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MPR121 Rev 2, 04/2010 Freescale Semiconductor Technical Data An Energy Efficient Solution by Freescale © Freescale Semiconductor, Inc., 2009, 2010. All rights reserved. This document contains a product under development. Freescale Semiconductor reserves the right to change or discontinue this product without notice. Advanced Information Proximity Capacitive Touch Sensor Controller MPR121 OVERVIEW The MPR121 is the second generation sensor controller after the initial release of the MPR03x series devices. The MPR121 will feature increased internal intelligence in addition to Freescale’s second generation capacitance detection engine. Some of the major additions include an increased electrode count, a hardware configurable I2C address, an expanded filtering system with debounce, and completely independent electrodes with auto-configuration built in. The device also features a 13th simulated electrode that represents the simultaneous charging of all the electrodes connected together to allow for increased proximity detection in a touch panel or touch screen array. Features • 1.71 V to 3.6 V operation • 29 ìA supply current at 16 ms sample period • 3 ìA shutdown current • 12 electrodes • Continuous independent auto-calibration for each electrode input • Separate touch and release trip thresholds for each electrode, providing hysteresis and electrode independence • I2C interface, with IRQ output to advise electrode status changes • 3 mm x 3 mm x 0.65 mm 20 lead QFN package • LED driver functionality with 8 shared LEDs • -40°C to +85°C operating temperature range Implementations • Switch Replacements • Touch Pads Typical Applications • PC Peripherals • MP3 Players • Remote Controls • Mobile Phones • Lighting Controls ORDERING INFORMATION Device Name Temperature Range Case Number Touch Pads IRC Address Shipping MPR121QR2 -40°C to +85°C 2059 (20-Pin QFN) 12-pads 0x5A - 0x5D Tape & Reel MPR121 Capacitive Touch Sensor Controller Top View Pin Connections Bottom View 20-PIN QFN CASE 2059-01 1 2 3 5 6 7 8 9 10 12 11 14 15 20 19 18 17 16 4 13 ELE4 ELE3 ELE6 ELE7 ELE5 VSS REXT ELE0 ELE1 ADDR VREG SCL IRQ SDA ELE2 VDD ELE11 ELE10 ELE9 ELE8