AR1020T-I/SO

Overview

The AR1020T-I/SO is a resistive touch screen controller from the Microchip mTouch AR1000 Series, housed in a 20-SOIC package. 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, drawing 17 mA typical current during touch events. It features I2C and SPI slave interfaces for host communication. Key specifications include a 140 reports per second coordinate rate, 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
• Integrated 128-byte user EEPROM for independent calibration storage
• Built-in drift compensation algorithm for enhanced reliability
• 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 the specific interface configuration required for the design. The AR1020 variant supports I2C and SPI modes, distinct from UART-only variants like the AR1011. Confirm that the M1 pin is correctly tied to VSS or VDD to select the desired communication protocol before integration.

Selection Notes

Select this component when using analog resistive touch screens requiring high-volume, low-cost solutions. Ensure the host system supports either I2C or SPI protocols. The device handles decoding internally, reducing host processing overhead. Verify sensor layer resistance and capacitance values fall within the specified operational limits for optimal performance.

Part Context

This part belongs to the AR1000 Series, which includes variants like the AR1011 (UART) and AR1021 (I2C/SPI). The 'T' suffix indicates tape and reel packaging, while 'SO' denotes the 20-pin Small Outline Integrated Circuit package. The '-I' suffix specifies the industrial temperature rating.

Replacement Considerations

The AR1020T-I/SS is a direct physical replacement offering the same electrical characteristics in a 20-SSOP package. Other series members like the AR1021 share functional similarities but may differ in specific interface implementations or packaging options.