Atmel. MXT224 Touch Screen Controller. Circuit Analysis of Charge Integrator, ADC, and I/O Blocks

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1 Atmel MXT224 Touch Screen Controller Circuit Analysis of Charge Integrator, ADC, and I/O Blocks For questions, comments, or more information about this report, or for any additional technical needs concerning semiconductor and electronics technology, please call Sales at Chipworks Richmond Road, Suite 500, Ottawa, ON K2H 5B7 Canada Tel: Fax:

2 Atmel MXT224 Touch Screen Controller Some of the information in this report may be covered by patents, mask and/or copyright protection. This report should not be taken as an inducement to infringe on these rights Chipworks Inc. This report is provided exclusively for the use of the purchasing organization. It can be freely copied and distributed within the purchasing organization, conditional upon the accompanying Chipworks accreditation remaining attached. Distribution of the entire report outside of the purchasing organization is strictly forbidden. The use of portions of the document for the support of the purchasing organization's corporate interest (e.g., licensing or marketing activities) is permitted, as defined by the fair use provisions of the copyright act. Accreditation to Chipworks must be attached to any portion of the reproduced information. CAR JMJG Revision 1.0 Published: August 31, 2010

3 Atmel MXT224 Touch Screen Controller Table of Contents Overview Schematics Cell Library Signal Cross-Reference List About Chipworks

4 Atmel MXT224 Touch Screen Controller Overview List of Figures...Page 1 List of Schematics...Page 1 Introduction...Page 4 Brief Design Overview...Page 5 Component Descriptions...Page 6 Device Summary...Page 9

5 Atmel MXT224 Touch Screen Controller Page 1 List of Figures To view, please click on the appropriate bookmark in the panel on the left Downstream Product Photographs HTC Incredible Downstream Product Photographs HTC EVO 4G Downstream Product Photographs Samsung Wave (GT-S8500) Package Markings Package X-Ray Die Markings Die Photograph Top Metal Die Photograph Metal Annotated Die Photograph Metal Die Architecture Metal 1 List of Schematics Top Level Diagram I/O Driver I/O Driver I/O Bias High Output Impedance OTA Precision Current Generator Amplifier Precision Current Generator Amplifier Bias Generator Current Driver Bias Strength Control Precision Current Generator Amplifier Precision Current Generator Amplifier 4

6 Atmel MXT224 Touch Screen Controller Page Variable Capacitor Charge Integrator Charge Integrator Control Charge Integrator Control Common Mode Feedback Amplifier Reference Generator Common Mode Feedback Charge Integrator Reference Generator Bit Pipeline ADC Matrix Drive Line Switch Clock Control Non-Overlapping Clock Generator Clock Delay ADC Reference Generator ADC Bias Generator ADC Voltage Reference Generator ADC Voltage Reference Selector ADC Amplifier ADC Voltage Reference Generator ADC Voltage Reference Selector Pipeline ADC Stage (Type 1) ADC Stage with Decoder Signal Comparator Comparator MDAC Bootstrap Switch Variable Capacitor Capacitor Feedback Pipeline ADC Amplifier Pipeline ADC Stage (Type 2) MDAC 2

7 Atmel MXT224 Touch Screen Controller Page Pipeline ADC Amplifier ADC Stage Retiming Buffers Reference Generator Schmitt Trigger Variable VREF Reference Generator Buffer Reference Generator OTA Buffer Main Bias Generator Reference Generator Bandgap Bias Generator Bandgap Voltage Reference Variable Resistor Load Buffer Amplifier Shutdown Generator High Speed BGREF Monitor Variable Resistor Comparator Data Interface Variable Delay Logic Softstart Level Shifter Digital Control Interface

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