AR1020-I/ML

Overview

The Microchip AR1020-I/ML is a resistive touch screen controller from the mTouch AR1000 Series, housed in a 20-lead QFN package. 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. Operating on a 2.5V to 5.0V supply, it features I2C slave communication (address 0x4D) and includes 128 bytes of user EEPROM for calibration storage. The device operates within an industrial temperature range (-40°C to +85°C) and incorporates built-in drift compensation algorithms.

Feature Summary

• Supports 4-wire, 5-wire, and 8-wire analog resistive touch sensors
• Includes 128 bytes of onboard user EEPROM for independent calibration storage
• Features built-in drift compensation algorithms for reliable coordinate reporting
• Operates within an industrial temperature range of -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 corresponds to the I2C interface variant, as the datasheet indicates SPI support is primarily associated with the AR1021 model. Confirm the package type matches the required PCB footprint, noting that the 'ML' suffix typically denotes the QFN package. Ensure the design accounts for the specific voltage levels and pull-up requirements for the I2C bus connections.

Selection Notes

Select this component when a cost-effective, universal solution for analog resistive screens is required. It is suitable for designs needing onboard calibration data retention via its 128-byte EEPROM. Verify compatibility with the target sensor's wire configuration (4, 5, or 8-wire) and ensure the host system can handle the I2C protocol if using the AR1020 variant specifically.

Part Context

The AR1020-I/ML belongs to the Microchip mTouch AR1000 Series, which provides sophisticated decoding algorithms to reduce host processing overhead. This series is designed for high-volume, small form-factor applications. The AR1020 variant specifically focuses on I2C connectivity, distinguishing it from other models in the family that may offer SPI or UART interfaces.

Replacement Considerations

The AR1021T-I/ML is a pin-compatible alternative within the same series that offers SPI and I2C interface options instead of being limited to I2C. Designers requiring additional communication protocols should consider the AR1021 model while maintaining the same package and functional capabilities.