AR1011T-I/ML

Overview

The Microchip AR1011T-I/ML is a resistive touch screen controller from the mTouch AR1000 Series, designed for high-volume, small form factor applications. It supports 4-wire, 5-wire, and 8-wire analog resistive sensors with a maximum 10-bit resolution and a typical report rate of 140 reports per second. The device operates on a 2.5V to 5.0V supply and features an integrated UART interface at 9600 baud. Key specifications include a standby current of 40 µA (typical) at 2.5V and 85 µA at 5V. It includes 128 bytes of user EEPROM for calibration storage and built-in drift compensation algorithms.

Feature Summary

• Supports 4-wire, 5-wire, and 8-wire analog resistive touch sensors
• Integrated UART communication interface operating at 9600 baud
• Built-in drift compensation algorithm and 128 bytes of user EEPROM
• Industrial temperature range operation (-40°C to +85°C)

Applications

• Mobile communication devices
• Personal Digital Assistants (PDA)
• Global Positioning Systems (GPS)
• Point of Sale Terminals

Procurement Notes

Verify that the specific part number AR1011T-I/ML corresponds to the UART interface variant, as other members of the AR1000 series may utilize SPI or I2C interfaces. Confirm package compatibility with the QFN-20 footprint during integration. Ensure ESD protection components selected for the design do not introduce excessive capacitance that could degrade touch performance.

Selection Notes

Select this component when a UART interface is required for host communication instead of SPI or I2C. The M1 pin must be configured appropriately to enable UART mode. Consider the power consumption requirements, noting that operating current increases to approximately 17 mA during active touch sensing compared to microampere standby levels.

Part Context

This component belongs to the Microchip mTouch AR1000 Series of resistive touch screen controllers. The 'AR1011' designation specifically indicates the UART communication capability, distinguishing it from variants like the AR1021 which support I2C and SPI. The '-I/' suffix denotes industrial temperature rating, and '/ML' identifies the QFN-20 package type.

Replacement Considerations

Direct functional replacements within the same family include the AR1011T-I/SO, which offers identical electrical characteristics but utilizes a SOIC-20 package. Other AR1000 series parts require interface verification, as they may use different communication protocols such as I2C or SPI.