AR1100T-I/SO

Overview

The Microchip AR1100T-I/SO is a resistive touch screen controller in a 20-lead SOIC package. It supports 4, 5, and 8-wire analog resistive sensors with 10-bit resolution (reported as 12-bit). The device features automatic detection of USB V2.0 Full Speed or UART (9600 baud) communication. Operating voltage ranges from 3.3V to 5.0V, with an operating current of less than 25 mA during touch activity. It includes 96 bytes of user EEPROM and operates within an industrial temperature range of -40°C to +85°C.

Feature Summary

• Automatic detection and selection between USB V2.0 Full Speed and UART communication protocols
• Support for 4-wire, 5-wire, and 8-wire analog resistive touch screens
• Built-in drift compensation algorithm and power-saving sleep mode
• USB enumeration options including HID-MOUSE, HID-DIGITIZER, and HID-GENERIC

Applications

• Industrial controls and self-service kiosks
• Point of Sale (POS) terminals
• Mobile communication devices and PDAs
• Medical devices and portable instruments

Procurement Notes

Verify the suffix 'SO' confirms the 20-lead Small Outline Integrated Circuit (SOIC) package type. Confirm the 'I' designation indicates the industrial temperature range (-40°C to +85°C). Ensure the specific revision matches the required firmware capabilities for calibration and EEPROM access via the host interface.

Selection Notes

Select this component when a universal resistive touch solution is required that automatically adapts to sensor electrical characteristics. It is suitable for designs needing plug-and-play USB compatibility without custom drivers for basic mouse functionality. Consider the 20-lead SOIC package constraints for PCB layout and thermal management within the specified operating voltage range.

Part Context

The AR1100T-I/SO belongs to the mTouch AR1100 series, building upon the AR1000 architecture. It provides field flash updatability and integrates a boot loader for reprogramming. The device is part of Microchip's portfolio of touch screen controllers designed for low-risk integration across various consumer and industrial applications.

Replacement Considerations

The AR1100BRD is a development kit for evaluating the AR1100 family, not a direct pin-compatible replacement. For alternative packages within the same family, consider the AR1100T-I/SS (20-lead SSOP) or the QFN variant, ensuring interface and pinout compatibility.