MAX11803ETC+T

Overview

The MAX11803ETC+T is a low-power, ultra-small resistive touch-screen controller manufactured by Analog Devices Inc./Maxim Integrated. It operates from a single supply of 1.70V to 3.6V and features a 12-bit SAR ADC with a multiplexer for interfacing with resistive touch-screen panels. The device supports the I2C serial bus interface and includes digital preprocessing to reduce bus loading and application-processor resource requirements. It offers direct and autonomous operating modes, data tagging for measurement and touch event information, and automatic low-power mode entry between conversions.

Feature Summary

• I2C Serial Interface: Supports up to 400kHz communication.
• 12-Bit SAR ADC: Provides high-resolution X/Y coordinate and touch pressure measurements.
• Autonomous Mode: Periodically scans the touch screen for events without host intervention, utilizing an on-chip FIFO.
• Data Tagging: Records measurement type (X, Y, Z1, Z2) and touch event status (initial, continuing, release).
• Low Power Consumption: 343µW at VDD = 1.7V, 34.4ksps; 888µW at VDD = 3.3V, 34.4ksps.

Applications

• Mobile Communication Devices
• PDAs, GPS Receivers, Personal Navigation Devices, Media Players
• Portable Instruments
• POS Terminals
• Handheld Games

Procurement Notes

Verify the component status as the source material indicates potential discontinuance or limited availability for this series. Confirm the package type is 12-pin TQFN (4mm x 4mm) with an exposed pad. Ensure the ordering suffix '+T' corresponds to tape and reel packaging as defined in the datasheet. Check RoHS compliance status for lead-free verification.

Selection Notes

Select the MAX11803ETC+T when an I2C interface is required, as opposed to the SPI-based MAX11802. This part is suitable for power-sensitive handheld applications due to its low voltage operation (1.7V to 3.6V) and autonomous scanning capabilities. Consider the 12-pin TQFN package constraints for PCB layout. Verify temperature range requirements against the -40°C to +85°C specification.

Part Context

The MAX11803 is part of the MAX11800–MAX11803 family of low-power touch-screen controllers. While the MAX11800/MAX11801 and MAX11802 support SPI, the MAX11801/MAX11803 specifically support the I2C serial bus. All devices in the family share similar core functionalities including 12-bit resolution, digital preprocessing, and low-power modes, but differ in interface and specific feature sets like autonomous mode availability.

Replacement Considerations

Public confirmed substitute part numbers are not provided in the verified source material. The MAX11801EWC+T is listed in the same family but uses a WLP package and I2C interface. Cross-reference with other MAX118xx series parts if interface compatibility allows, but verify pinout and register compatibility independently.