MAX11803ETC+

Overview

The MAX11803ETC+ 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 an integrated multiplexer for interfacing with 4-wire resistive touch panels. The device supports the I²C serial bus interface, enabling communication with application processors. It includes digital preprocessing capabilities, such as data tagging and filtering, which reduce bus loading and interrupt servicing frequency. The component is specified over an extended temperature range of -40°C to +85°C and is housed in a 12-pin TQFN package.

Feature Summary

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

Applications

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

Procurement Notes

Verify the specific ordering suffix against the manufacturer's current documentation. The '+' suffix indicates lead-free and RoHS compliance. Confirm the package variant matches the required form factor, as the MAX11803 series is also available in WLP packages. Ensure the temperature grade corresponds to the application environment, as automotive qualified versions exist with different suffixes.

Selection Notes

Select the MAX11803ETC+ when an I²C interface is required, distinguishing it from the SPI-based MAX11802. Consider the autonomous mode capability if system power consumption must be minimized by reducing application processor involvement. Verify that the 12-bit resolution and 4-wire panel compatibility meet the design specifications. Check for alternative packaging options like WLP if board space constraints are critical.

Part Context

The MAX11803ETC+ belongs to the MAX11800–MAX11803 family of low-power touch-screen controllers. This family shares core functionalities including 12-bit SAR ADCs, digital preprocessing, and low-power modes. The primary differentiation within the family lies in the serial interface protocol; the MAX11803 specifically utilizes the I²C bus, whereas other models in the series support SPI.

Replacement Considerations

Publicly confirmed substitute part numbers are not provided in the source material. Designers should consult the manufacturer's official documentation for cross-reference information or updated product line replacements.