MAX11803EWC+T

Overview

The MAX11803EWC+T is a low-power, ultra-small resistive touch-screen controller from Analog Devices/Maxim Integrated. It operates on a single supply of 1.7V to 3.6V and features a 12-bit SAR ADC with a multiplexer for interfacing with 4-wire resistive touch panels. The device supports the I2C serial bus interface, enabling communication at speeds up to 400kHz. It includes digital preprocessing capabilities, such as data tagging and filtering, which reduce application processor resource requirements. The component is housed in a 12-pin Wafer-Level Package (WLP) measuring 1.6mm x 2.1mm and is specified for operation over an extended temperature range of -40°C to +85°C.

Feature Summary

• I2C Serial Interface: Supports standard I2C communications with clock frequencies up to 400kHz.
• 12-Bit Resolution: Utilizes a 12-bit Successive Approximation Register (SAR) ADC for precise X/Y coordinate and pressure measurements.
• Low-Power Operation: Consumes 343µW at VDD = 1.7V and 34.4ksps; enters low-power modes automatically between conversions.
• Digital Preprocessing: Includes data tagging for measurement type and touch event information, along with noise reduction filtering.

Applications

• Mobile Communication Devices
• PDAs and GPS Receivers
• Personal Navigation Devices
• Portable Instruments

Procurement Notes

Verify the specific ordering suffix '+T' indicates tape-and-reel packaging when sourcing components. Confirm that the 'E' suffix corresponds to the -40°C to +85°C extended temperature range rather than the automotive grade. Ensure compatibility with I2C bus protocols, as this model does not support SPI interfaces found in other variants within the same family.

Selection Notes

Select the MAX11803EWC+T specifically for designs requiring an I2C interface, distinguishing it from the MAX11800/MAX11802 which utilize SPI. Choose the WLP package variant when board space is constrained to a 1.6mm x 2.1mm footprint. Verify that the system power supply remains within the 1.7V to 3.6V operating range to ensure correct ADC functionality and interface timing.

Part Context

This component belongs to the MAX11800–MAX11803 family of low-power touch-screen controllers. While sharing core architecture with siblings like the MAX11800 and MAX11802, the MAX11803 is distinct in its support for the I2C serial bus instead of SPI. It shares the same 12-bit resolution and ultra-small WLP or TQFN package options, targeting portable applications where power efficiency and minimal PCB area are critical design constraints.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Designers should verify pinout and register compatibility if considering alternative touch-screen controllers from different manufacturers.