AR1100T-I/MQ

Overview

The AR1100T-I/MQ is a resistive touch screen controller from Microchip Technology, housed in a 20-lead QFN (5 x 5 mm) package. It supports 4-wire, 5-wire, and 8-wire analog resistive sensors with a maximum resolution of 10 bits. The device operates on a supply voltage of 3.3V to 5.0V and features automatic detection between USB V2.0 Full Speed and UART (9600 BAUD) communication protocols. Key electrical specifications include an operating current of less than 25 mA during touch activity and standby currents under 10 uA for UART mode. It includes 96 bytes of user EEPROM and functions within an industrial temperature range.

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 96 bytes of user-accessible EEPROM
• Power-saving sleep mode with standby current below 10 uA in UART mode

Applications

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

Procurement Notes

Verify the ordering suffix 'MQ' corresponds to the 20-lead QFN (5 x 5 mm) package type as specified in the datasheet. Confirm that the '-I' designation indicates the industrial temperature range (-40°C to +85°C). Ensure the specific revision of the silicon matches the design requirements, as performance characteristics may vary slightly with sensor electrical properties.

Selection Notes

Select this component when a universal resistive touch solution is required with minimal configuration overhead. The AR1100 automatically adapts to sensor sensitivity and contact resistance. Ensure the host system supports either USB HID or UART at 9600 BAUD. For applications requiring low power consumption, utilize the sleep mode feature, noting that USB enumeration takes precedence if connected.

Part Context

The AR1100 is part of the mTouch family, building upon the AR1000 series. It offers field flash updatability and free drivers for major operating systems. The device simplifies integration by providing plug-and-play USB capabilities while maintaining compatibility with legacy RS-232 interfaces through UART mode.

Replacement Considerations

The AR1100-I/MQ serves as the non-tape-and-reel equivalent to the AR1100T-I/MQ. Both share identical electrical and functional specifications; the distinction lies solely in the packaging format for manufacturing assembly.