CRTOUCHB10VFM NXP

Freescale Semiconductor Document Number: CRTOUCHDS Rev. 3, 04/2013 Data Sheet: Product Preview CRTouch CRTouch Data Sheet Capacitive and Resistive Touch Sensing Application Specific IC. The CRTouch is a Ready Play solution device designed to serve as a four wire and five wire resistive touch driver and a capacitive touch sensing device in a single 32-pin QFN package. It provides all the signal interfacing and processing to calculate X and Y coordinates as well as to detect and process two touch gestures for human-machine interface applications. Its key features are: Features X and Y coordinates calculated from a resistive touch screen with built-in filter to improve stability Slide gesture detection for single touch. Two touch gesture detection for resistive four wire screens Zoom In and Zoom Out Rotate with clockwise and counter clockwise indication. Four capacitive keys in different configurations Rotary Slider Keypad UART communication and I2C communication available Baud-rate auto detection pin to enable automatic synchronization with any UART baud-rate between 9600 and 115200 bps using the same UART RX pin Configurable scanning period that can calculate up to 200 coordinate points per second 1.8 to 3.6 volts operation 32-pin QFN package 40 C to 105 C operating temperature Normal Run mode, Sleep mode, and Shutdown mode for lower power consumption operation This document contains information on a product under development. Freescale reserves the right to change or discontinue this product without notice. Freescale Semiconductor, Inc., 2007-2012. All rights reserved.Table of Contents 1 Pins and Connections 3 3 Serial Communications . 22 1.1 Device block diagram .3 3.1 I2C interface 22 1.2 Device pin out .4 3.1.1 I2C bit transfer . 23 1.3 Recommended system connections 5 3.1.2 I2C START and STOP conditions . 23 1.4 Signals description .5 3.1.3 I2C transferring data . 24 2 Functional Description .6 3.1.4 I2C acknowledge . 24 2.1 CRTouch resistive touchscreen scanning 7 3.1.5 CRTouch I2C slave address . 24 2.1.1 Touchscreen electrical signals .7 3.1.6 Message format for Writing CRTouch . 25 2.1.2 CRTouch scanning process .8 3.2 UART 25 2.1.3 Resistive events .10 3.2.1 UART Baudrate auto detection . 25 2.1.4 Calibration process 10 3.2.2 UART communication protocol . 26 2.1.5 Data FIFO .14 3.2.3 Registers Read through UART . 26 2.1.6 Resistive gestures .15 3.2.4 Registers Write through UART . 27 2.2 Capacitive subsystem 17 4 Memory Map and Registers Description 28 2.2.1 Capacitive touch detection .17 4.1 Device memory map 28 2.2.2 Keypad control 18 4.2 Registers description 34 2.2.3 Rotary and slider control 18 4.2.1 Resistive Touch Status registers . 34 2.3 Modes of operation 19 4.2.2 Capacitive Touch Sensing Status registers . 41 2.3.1 Run mode .19 4.2.3 Resistive Touch Configuration registers 44 2.3.2 Sleep mode 19 4.2.4 Calibration Values registers . 50 2.3.3 Shutdown mode .20 4.2.5 TSS Configuration registers . 51 2.4 Internal voltage regulator .21 Appendix AElectrical Specifications . 59 2.4.1 Internal voltage regulator features .21 Appendix BPacking Information 62 2.4.2 Internal voltage regulator modes of operation 21 CRTouch Data Sheet, Rev. 3 2 Freescale Semiconductor