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TSC2014IYZGR Datasheet(PDF) 13 Page - Texas Instruments |
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TSC2014IYZGR Datasheet(HTML) 13 Page - Texas Instruments |
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13 / 62 page  PINTDAV I C 2 Serial Interface and Control VDD/REF X+ X- Y+ Y- AUX TEMP Mux PENIRQ DAV SAR ADC Internal Clock Touch Screen Drivers Interface RESET AD0 SCL SDA Copyright © 2016, Texas Instruments Incorporated 13 TSC2014 www.ti.com SBAS484B – SEPTEMBER 2010 – REVISED DECEMBER 2016 Product Folder Links: TSC2014 Submit Documentation Feedback Copyright © 2010–2016, Texas Instruments Incorporated 7 Detailed Description 7.1 Overview The TSC2014 is an analog interface circuit for a human interface touch screen device. A register-based architecture eases integration with microprocessor-based systems through a standard I2C bus. All peripheral functions are controlled through the registers and onboard state machines. The TSC2014 features include: • Very low-power touch screen controller • Very small onboard footprint • Relieves host from tedious routine tasks by flexible preprocessing, saving resources for more critical tasks • Ability to work on very low supply voltage • Minimal connection interface allows easiest isolation and reduces the number of dedicated I/O pins required • Miniature, yet complete; requires no external supporting component. • Enhanced ESD protection The TSC2014 consists of the following blocks (refer to the block diagram. • Touch Screen Interface • Auxiliary Input (AUX) • Temperature Sensor • Acquisition Activity Preprocessing • Internal Conversion Clock • I2C Interface 7.2 Functional Block Diagram 7.3 Feature Description 7.3.1 Touch Screen Operation A resistive touch screen operates by applying a voltage across a resistor network and measuring the change in resistance at a given point on the matrix where the screen is touched by an input (stylus, pen, or finger). The change in the resistance ratio marks the location on the touch screen. The TSC2014 supports the resistive 4-wire configurations, as shown in Figure 16. The circuit determines location in two coordinate pair dimensions, although a third dimension can be added for measuring pressure. |
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