MAX11801GTC/V+

Overview

The MAX11801GTC/V+ is an automotive-grade, low-power resistive touch-screen controller from Analog Devices Inc./Maxim Integrated. It operates on a single 1.7V to 3.6V supply and features a 12-bit SAR ADC with a multiplexer for interfacing with four-wire touch screens. The device supports I2C serial communication at up to 400kHz. Key capabilities include direct and autonomous operating modes, data tagging for measurement type and touch event identification, and digital preprocessing to reduce host processor load. It includes an on-chip FIFO in autonomous mode and enters low-power states automatically between conversions.

Feature Summary

• I2C Interface: Supports 400kHz I2C serial bus communication.
• Dual Operating Modes: Offers Direct Mode for host-controlled activity and Autonomous Mode for automatic scanning with on-chip FIFO storage.
• Digital Preprocessing: Includes data tagging (X/Y/Z1/Z2 measurements and touch events), noise reduction filtering, and aperture mode for spatial filtering.
• Automotive Grade & Power: Qualified for -40°C to +105°C range; consumes 343µW at 1.7V/34.4ksps and 888µW at 3.3V/34.4ksps.

Applications

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

Procurement Notes

Verify the 'V+' suffix indicates lead-free/RoHS compliance and automotive qualification (-40°C to +105°C). Confirm the package is 12-pin TQFN-EP. Ensure the I2C interface requirement matches the MAX11801 variant, as SPI variants are distinct part numbers within the family.

Selection Notes

Select the MAX11801 specifically for I2C connectivity; use MAX11800/MAX11802 for SPI. Choose the GTC/V+ suffix for extended automotive temperature ranges (-40°C to +105°C) versus the ETC+ industrial range. Consider Autonomous Mode if reducing host CPU interrupt overhead is critical, leveraging the internal FIFO.

Part Context

This component belongs to the MAX11800–MAX11803 family of ultra-small resistive touch-screen controllers. The MAX11801 variant is distinguished by its I2C interface, whereas the MAX11800 and MAX11802 use SPI. All variants share similar ADC performance and power management features but differ in communication protocol and specific ordering suffixes for temperature and packaging.

Replacement Considerations

Direct substitutes within the same family include MAX11800GTC/V+ (SPI interface) or MAX11803GTC/V+ (I2C interface, different pinout/functionality mapping may apply). Verify interface compatibility (I2C vs SPI) and temperature grade when replacing.

FAQ

What is the difference between Direct and Autonomous modes?

In Direct Mode, the application processor controls all touch-screen controller activity. In Autonomous Mode, the device periodically scans the touch screen for events without host intervention, using an on-chip FIFO to store results, which reduces system power consumption.

How does the MAX11801 handle touch event data?

It supports data-tagging, which records the type of measurement performed (X, Y, Z1, or Z2) and the type of touch event (initial touch, continuing touch, or touch release).

What are the power consumption specifications?

The device consumes 343µW at VDD = 1.7V and 34.4ksps, and 888µW at VDD = 3.3V and 34.4ksps.