AR1100-I/SO

Overview

The Microchip Technology AR1100-I/SO is a fully integrated resistive touch screen controller supporting 4, 5, and 8-wire analog sensors. It features automatic detection and selection between USB V2.0 Full Speed and UART (9600 baud) communication protocols. The device operates on a 3.3V to 5.0V supply with an operating current of less than 25 mA during touch activity. It provides up to 10-bit resolution for touch coordinates, dynamically adapting to sensor electrical characteristics such as contact resistance and capacitance. The component includes 96 bytes of user EEPROM for configuration storage and supports industrial temperature ranges within a 20-lead SOIC package.

Feature Summary

• Automatic detection and switching between USB V2.0 Full Speed and UART communication modes
• Support for 4-wire, 5-wire, and 8-wire analog resistive touch screens
• Built-in drift compensation algorithm and 96 bytes of user-accessible EEPROM
• USB enumeration options including HID-MOUSE, HID-DIGITIZER, and HID-GENERIC

Applications

• Industrial control panels and self-service kiosks
• Point of Sale (POS) terminals
• Portable medical devices and instruments
• Touch screen monitors and media players

Procurement Notes

Verify the specific suffix 'I/SO' confirms the Industrial temperature range (-40°C to +85°C) and the 20-lead SOIC package type. Ensure the ordering part number matches the required tape and reel or cut tape format if applicable. Confirm that the device revision aligns with the latest data sheet DS41606B for accurate pinout and electrical specifications.

Selection Notes

Select this component when a universal resistive touch solution is required without complex configuration. The AR1100-I/SO is suitable for designs needing plug-and-play USB compatibility with standard OS drivers or simple UART integration. Consider the 20-lead SOIC package constraints and ensure the host system supports the required 3.3V to 5.0V operating voltage range.

Part Context

The AR1100 series builds upon the AR1000 family, offering enhanced field flash updatability and broader operating system driver support. The '-I' designation indicates the industrial temperature grade, while '/SO' specifies the 20-lead Small Outline Integrated Circuit package. This part serves as a bridge between legacy resistive sensors and modern digital interfaces.

Replacement Considerations

Direct replacements include other variants within the AR1100 family, such as AR1100T-I/SS (SSOP package) or AR1100-I/QFN (QFN package), provided the mechanical footprint and pinout compatibility are verified. Cross-family upgrades may require schematic and firmware modifications.