AR1011T-I/SO

Overview

The AR1011T-I/SO is a resistive touch screen controller from the Microchip AR1000 series, designed for high-volume embedded applications. It supports 4-wire, 5-wire, and 8-wire analog resistive sensors with a maximum 10-bit resolution. The device operates on a 2.5V to 5.0V supply and features a typical operating current of 3.0 mA (no touch) and 17 mA (touch). It communicates via UART at 9600 baud. Key specifications include a report rate of 140 reports per second, built-in drift compensation, and 128 bytes of user EEPROM for calibration storage.

Feature Summary

• Supports 4-Wire, 5-Wire, and 8-Wire analog resistive touch sensors
• Built-in drift compensation algorithm for enhanced reliability
• 128 Bytes of User EEPROM for independent coordinate calibration
• UART communication interface at 9600 Baud Rate

Applications

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

Procurement Notes

Verify that the specific part number AR1011T-I/SO corresponds to the UART interface variant, as other suffixes in the AR1000 series support SPI or I2C protocols. Confirm the SOIC-20 package availability and ensure the host system provides the required 2.5V to 5.0V power supply range. Check for RoHS compliance status if required by the manufacturing environment.

Selection Notes

Select this component when a low-cost, universal resistive touch solution is needed without complex host processing overhead. Ensure the touch sensor layer resistance falls within the 50-2,000 Ohm typical range. Verify that the application requires UART connectivity rather than I2C or SPI, which are available in other variants like the AR1021. Consider the industrial temperature range (-40°C to +85°C) for environmental suitability.

Part Context

The AR1011T-I/SO belongs to the Microchip mTouch AR1000 Series, which includes variants supporting different communication interfaces. While the AR1021 supports I2C and SPI, the AR1011 specifically utilizes UART for data transmission. This series shares common hardware features such as brown-out detection set to 2.2V and power-saving sleep modes across all models.

Replacement Considerations

The AR1010T-I/ML is a related model in the same series but uses a VQFN-20 package instead of SOIC-20. Other variants like the AR1021 offer I2C or SPI interfaces instead of UART. Ensure pin compatibility and interface protocol alignment when substituting.