AR1100-I/MQ

Overview

The Microchip AR1100-I/MQ is a resistive touch screen controller in a 20-lead QFN (5x5 mm) package. It supports 4, 5, and 8-wire analog resistive sensors with 10-bit resolution and up to 150 reports per second. The device features automatic detection of USB V2.0 Full Speed or UART (9600 baud) communication modes. Operating voltage ranges from 3.3V to 5.0V, with operating currents under 17 mA (no touch) and 25 mA (touch). It includes 96 bytes of user EEPROM and operates within an industrial temperature range.

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 96 bytes of user EEPROM
• Industrial temperature range operation (-40°C to +85°C)

Applications

• Mobile communication devices
• Point of Sale (POS) terminals
• Self-service kiosks

Procurement Notes

Verify the 'MQ' suffix corresponds to the 20-lead QFN (5x5 mm) package as specified in the datasheet's Package Types section. Confirm that the '-I' designation indicates the industrial temperature range (-40°C to +85°C). Ensure the specific revision of the datasheet DS41606B matches the silicon revision required for the application design.

Selection Notes

Select this component when a universal resistive touch solution is needed with minimal configuration. The AR1100 automatically adapts to sensor electrical characteristics such as sensitivity and contact resistance. It is suitable for designs requiring either USB plug-and-play functionality or simple serial UART connectivity without hardware handshaking.

Part Context

The AR1100 is part of the mTouch family, building upon the AR1000 series. It provides field flash updatability via a boot loader and supports multiple USB HID device types (Mouse, Digitizer, Generic). The device integrates an internal voltage reference and oscillator, reducing external component count compared to previous generations.

Replacement Considerations

The AR1000 series is a predecessor but lacks some integrated features like the built-in drift compensation. Other Microchip controllers may offer capacitive sensing or different interface options. Verify pin compatibility and software driver support if migrating from other resistive touch controllers.