AR1011-I/SO

Overview

The AR1011-I/SO is a resistive touch screen controller from the Microchip AR1000 series, housed in a 20-pin SOIC package. It operates on a supply voltage of 2.5V to 5.0V with a typical operating current of 17 mA during touch events and standby current as low as 85 µA at 5V. The device provides 10-bit resolution and supports a report rate of up to 140 reports per second. It features built-in drift compensation and 128 bytes of user EEPROM for calibration storage. Communication is handled via UART at 9600 baud.

Feature Summary

• Supports 4-wire, 5-wire, and 8-wire analog resistive touch sensors
• Built-in drift compensation algorithm for stable performance
• 128 bytes of non-volatile user EEPROM for coordinate calibration
• Power-saving sleep mode with low standby current

Applications

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

Procurement Notes

Verify the specific ordering suffix to confirm the package type and temperature range. The 'I' suffix indicates an industrial temperature range (-40°C to +85°C), while 'SO' denotes the SOIC-20 package. Ensure the design utilizes UART communication, as this variant does not support SPI or I2C interfaces found in other family members like the AR1021.

Selection Notes

Select the AR1011-I/SO when UART connectivity is required for the host interface. Confirm that the touch sensor resistance falls within the 50-2,000 Ω typical range. Verify that the system power supply remains within the 2.5V to 5.0V operating window. Consider the AR1021 if higher speed SPI or I2C communication is needed instead of the 9600 baud UART limit.

Part Context

This component belongs to the AR1000 Series Resistive Touch Screen Controllers. It shares core decoding algorithms and hardware architecture with variants like the AR1010 and AR1021. The primary distinction lies in the communication interface; the AR1011 is specifically configured for UART operation, whereas other parts in the series may offer SPI or I2C options.

Replacement Considerations

The AR1011-I/SS is a pin-compatible alternative using an SSOP-20 package. For different communication interfaces, consider the AR1021 for SPI/I2C support. Cross-referencing with older AR1000 revisions requires checking for silicon errata sheets.