AR1020T-I/SS

Overview

The Microchip Technology AR1020T-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 2.5V to 5.0V supply and features I2C and SPI slave interfaces for communication. Key specifications include an operating current of 17 mA during touch detection and a standby current as low as 40 µA at 2.5V. It includes 128 bytes of user EEPROM for calibration storage and functions within an industrial temperature range of -40°C to +85°C.

Feature Summary

• Supports 4-wire, 5-wire, and 8-wire analog resistive touch sensors with built-in drift compensation.
• Provides 10-bit resolution touch coordinates with a typical report rate of 140 reports per second.
• Features I2C (Slave mode) and SPI (Slave mode) communication interfaces.
• Includes 128 bytes of onboard User EEPROM for storing calibration data independently.

Applications

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

Procurement Notes

Verify the specific suffix 'I/SS' confirms the industrial temperature grade (-40°C to +85°C) and SSOP package type. Confirm interface requirements match the AR1020 variant, which supports I2C and SPI, distinct from the AR1021 UART/I2C/SPI configuration. Ensure host system voltage levels are compatible with the 2.5V to 5.0V operating range.

Selection Notes

Select this component when designing systems requiring support for various resistive sensor topologies (4, 5, or 8-wire). The AR1020 is suitable for applications needing I2C or SPI connectivity rather than UART. Consider the 128-byte EEPROM capacity for calibration needs and ensure the host processor can handle the required pull-up resistors for open-drain I2C lines.

Part Context

This part belongs to the Microchip AR1000 Series, designed as a universal, cost-effective solution for resistive touch screens. The series integrates proprietary decoding algorithms to reduce host processing overhead. The AR1020 variant specifically targets designs utilizing I2C or SPI protocols, offering a resource-efficient integration path for embedded systems.

Replacement Considerations

The AR1021T-I/SS is a pin-compatible alternative within the same series but adds UART support alongside I2C and SPI. Verify that the host interface matches the selected variant's capabilities, as the AR1020 does not support UART communication.