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Low-Power, Ultra-Small Resistive Touch-Screen Controllers with I²C/SPI Interface

Industry's Most Feature-Packed, Smallest Footprint, and Low-Power Resistive Touch-Screen Controllers

Product Details

Key Features

Simplified Block Diagram

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Key Features

  • 4-Wire Touch-Screen Interface
  • X/Y Coordinate and Touch Pressure Measurement
  • Ratiometric Measurement
  • 12-Bit SAR ADC
  • Single 1.7V to 3.6V Supply
  • Two Operating Modes—Direct and Autonomous
  • Data Tagging Provides Measurement and Touch Event Information
  • Data Filtering Provides Noise Reduction
  • Aperture Mode Provides Spatial Filtering
  • Digital Processing Reduces Bus Activity and Interrupt Generation
  • Programmable Touch-Detect Pullup Resistors
  • Auto Power-Down Control for Low-Power Operation
  • 25MHz SPI Interface (MAX11800/MAX11802)
  • 400kHz I²C Interface (MAX11801/MAX11803)
  • 1.6mm x 2.1mm, 12-Pin WLP and 4mm x 4mm, 12-Pin TQFN
  • Low-Power Operation
    • 343µW at VDD = 1.7V, 34.4ksps
    • 888µW at VDD = 3.3V, 34.4ksps
  • ESD Protection
    • ±4kV HBM
    • ±8kV HBM (X+, X-, Y+, Y-)
    • ±1kV CDM
    • ±200V MM

Applications/Uses

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

Description

The MAX11800–MAX11803 low-power touch-screen controllers operate from a single supply of 1.70V to 3.6V, targeting power-sensitive applications such as handheld equipment. The devices contain a 12-bit SAR ADC and a multiplexer to interface with a resistive touch-screen panel. A digital serial interface provides communications.

The MAX11800–MAX11803 include digital preprocessing of the touch-screen measurements, reducing bus loading and application-processor resource requirements. The included smart interrupt function generator greatly reduces the frequency of interrupt servicing to the devices. The MAX11800–MAX11803 enter low-power modes automatically between conversions to save power, making the devices ideal for portable applications.

The MAX11800/MAX11801 offer two modes of operation: direct and autonomous. Direct mode allows the application processor to control all touch-screen controller activity. Autonomous mode allows the MAX11800/MAX11801 to control touch-screen activity, thereby freeing the application processor to perform other functions. In autonomous mode, the devices periodically scan the touch screen for touch events without requiring host-processor intervention. This can be used to reduce system power consumption. An on-chip FIFO is used during autonomous mode to store results, increasing effective data throughput and lower system power.

The MAX11800–MAX11803 support 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.

The MAX11800/MAX11802 support the SPI™ serial bus. The MAX11801/MAX11803 support the I²C serial bus. The MAX11800–MAX11803 are available in 12-pin TQFN and 12-pin WLP packages, and are specified over the -40°C to +85°C (extended) and -40°C to +105°C (automotive) temperature ranges.

Simplified Block Diagram

MAX11800, MAX11801, MAX11802, MAX11803: Typical Operating Circuits MAX11800, MAX11801, MAX11802, MAX11803: Typical Operating Circuits Zoom icon

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .