MAX11802ETC+

Overview

The MAX11802ETC+ is a low-power resistive touch-screen controller from Analog Devices Inc./Maxim Integrated, operating on a single 1.7V to 3.6V supply. It features a 12-bit SAR ADC and supports SPI serial communication at up to 25MHz. The device provides X/Y coordinate and touch pressure measurements with digital preprocessing to reduce bus loading. It includes autonomous mode for periodic scanning without host intervention, utilizing an on-chip FIFO to store results. Power consumption is specified at 343µW at 1.7V and 888µW at 3.3V, both at 34.4ksps. The component is available in a 12-pin TQFN package and operates over the -40°C to +85°C temperature range.

Feature Summary

• 12-Bit SAR ADC with ratiometric measurement capability
• SPI interface supporting 25MHz clock speed
• Autonomous and Direct operation modes with on-chip FIFO
• Data tagging for measurement type and touch event identification

Applications

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

Procurement Notes

Verify the ordering suffix 'ETC+' indicates a lead-free/RoHS-compliant package in the 12-pin TQFN-EP format. Confirm the temperature range is -40°C to +85°C. Ensure the specific variant matches the SPI interface requirement, as I2C variants exist within the same family. Cross-reference the datasheet revision to confirm pinout and electrical characteristics remain consistent with current design requirements.

Selection Notes

Select the MAX11802ETC+ when an SPI interface is required, distinguishing it from the I2C-based MAX11801/MAX11803 models. The autonomous mode and FIFO are critical for reducing application processor load in battery-sensitive designs. Verify that the 12-bit resolution meets the precision needs of the target resistive touch panel. Ensure the system voltage falls within the 1.7V to 3.6V operating range to maintain specified power and performance metrics.

Part Context

This component belongs to the MAX11800–MAX11803 family of low-power touch-screen controllers. The MAX11802 specifically denotes the SPI interface variant, whereas MAX11801 and MAX11803 use I2C. The 'ETC' suffix identifies the 12-pin TQFN package with an exposed pad, while '+T' would indicate tape and reel packaging. All family members share core functionalities like 12-bit ADCs and autonomous scanning capabilities.

Replacement Considerations

Direct substitutes include other MAX11802 variants such as MAX11802EWC+T (WLP package) if form factor changes are acceptable. For interface changes, MAX11801ETC+ offers identical functionality with I2C instead of SPI. Automotive qualified versions like MAX11802GTC/V+ are available for extended temperature ranges (-40°C to +105°C). Verify pin compatibility and register maps before substitution.