MAX11801ETC+

Overview

The MAX11801ETC+ is a low-power, ultra-small resistive touch-screen controller manufactured by Analog Devices Inc./Maxim Integrated. It operates from a single supply voltage ranging from 1.70V to 3.6V and features a 12-bit Successive Approximation Register (SAR) Analog-to-Digital Converter (ADC). The device supports the I²C serial bus interface with a maximum clock frequency of 400kHz. It provides X/Y coordinate and touch pressure measurements for 4-wire touch screens. 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

• 12-Bit SAR ADC with ratiometric measurement capability
• I²C Serial Interface supporting up to 400kHz
• Direct and Autonomous operating modes for flexible host control
• On-chip FIFO memory for autonomous mode data storage

Applications

• Mobile communication devices
• PDAs, GPS receivers, and personal navigation devices
• Portable instruments and POS terminals
• Handheld games and automotive center consoles

Procurement Notes

Verify the specific ordering suffix 'ETC+' against the manufacturer's current datasheet to confirm the package type (12-pin TQFN-EP) and temperature range (-40°C to +85°C). Ensure compatibility with the I²C interface requirements of the target system design.

Selection Notes

Select the MAX11801ETC+ when an I²C interface is required instead of SPI. This model is suitable for power-sensitive applications due to its low-power operation, which consumes 343µW at 1.7V and 34.4ksps. Consider the autonomous mode capabilities if reducing application processor interrupt servicing is a priority.

Part Context

The MAX11801ETC+ belongs to the MAX11800–MAX11803 family of low-power touch-screen controllers. While the MAX11800 and MAX11802 utilize an SPI interface, the MAX11801 and MAX11803 variants are designed specifically for I²C communication. All models share similar core functionalities including 12-bit resolution and low-power autonomous scanning.

Replacement Considerations

The MAX11803ETC+ serves as a functional alternative within the same family but utilizes an SPI interface rather than I²C. Direct substitution requires verifying that the host system supports SPI or that the interface logic can be adapted accordingly.