AR1020-I/SS

Overview

The Microchip Technology AR1020-I/SS is a resistive touch screen controller from the mTouch™ AR1000 Series, housed in a 20-SSOP package. It supports 4-wire, 5-wire, and 8-wire analog resistive sensors with a maximum 10-bit resolution. The device operates on a supply voltage of 2.5V to 5.0V ±5% and draws 17 mA typical current during touch operations. It features built-in drift compensation algorithms and 128 bytes of user EEPROM for calibration storage. Communication interfaces include I2C and SPI slave modes, enabling efficient integration into embedded systems without significant host processing overhead.

Feature Summary

• Supports 4-wire, 5-wire, and 8-wire analog resistive touch sensors
• Built-in drift compensation algorithm and 128 bytes of user EEPROM
• Industrial temperature range operation (-40°C to +85°C)
• Power-saving sleep mode with low standby current

Applications

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

Procurement Notes

Verify the specific suffix 'I/SS' corresponds to the industrial temperature range and SSOP package when sourcing. Confirm interface requirements, as the base AR1020 model typically supports I2C and SPI, whereas other variants like AR1021 may be required for specific protocol implementations or clock stretching behaviors. Ensure ESD protection components meet capacitance specifications to avoid degrading touch performance.

Selection Notes

Select the AR1020-I/SS for applications requiring industrial temperature stability and support for various resistive sensor configurations. The M2 pin hardware selection determines between 4/8-wire and 5-wire sensor types. Ensure the host system can handle the specific communication protocol (I2C or SPI) supported by this variant, noting that write conditions may require specific timing delays compared to other series members.

Part Context

The AR1020-I/SS belongs to the AR1000 Series, which includes variants like AR1010, AR1011, and AR1021. These controllers share core decoding algorithms but differ in communication interfaces and package options. The AR1020 specifically targets cost-effective, universal touch solutions with onboard calibration capabilities, distinguishing it from capacitive touch controllers in the same product family.

Replacement Considerations

Direct replacements within the AR1000 series include AR1020T-I/SO (SOIC package) or AR1020-I/ML (QFN package). Verify pin compatibility and interface support, as the AR1021 offers additional features like clock stretching on writes. Ensure any substitute maintains the 2.5V-5.0V operating voltage and industrial temperature rating.