AR1100T-I/SS

Overview

The Microchip AR1100T-I/SS is a resistive touch screen controller in a 20-lead SSOP package. It supports 4, 5, and 8-wire analog resistive sensors with a maximum 10-bit resolution (reported as 12-bit). The device operates on a 3.3V to 5.0V supply with an operating current of less than 25 mA during touch activity. It features automatic detection between USB V2.0 Full Speed and UART (9600 baud) communication protocols. Key specifications include a typical coordinate report rate of 150 reports per second and an internal 96-byte user EEPROM for configuration storage.

Feature Summary

• Automatic detection and selection 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 power-saving sleep mode
• 96 bytes of non-volatile user EEPROM for parameter storage

Applications

• Industrial control panels and self-service kiosks
• Point of Sale (POS) terminals
• Portable instruments and GPS devices
• Medical devices and handheld consumer electronics

Procurement Notes

Verify the ordering suffix 'SS' corresponds to the 20-lead SSOP package when sourcing components. Confirm that the '-I' suffix indicates the industrial temperature range (-40°C to +85°C). Ensure the specific revision of the datasheet DS41606B matches the silicon version required for the design implementation.

Selection Notes

Select this component for designs requiring universal resistive touch integration with minimal host driver requirements. The automatic USB/UART detection simplifies hardware design by allowing flexible connectivity options. Ensure the target application utilizes resistive sensors compatible with the supported wire configurations and electrical characteristics such as lead-to-lead resistance between 50 and 2000 Ohms.

Part Context

The AR1100T-I/SS belongs to the Microchip mTouch AR1100 series, which builds upon the previous AR1000 family. This series provides a fully integrated solution for resistive touch interfaces, emphasizing low total system cost and ease of integration through built-in drivers for major operating systems.

Replacement Considerations

The AR1100BRD is a development kit for evaluating the AR1100 series, not a direct pin-for-pin replacement. For alternative packages within the same functional family, consider the AR1100T-I/SO (20-SOIC) or the QFN variant, ensuring voltage and interface compatibility remain consistent.