MAX11801

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


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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.
MAX11800, MAX11801, MAX11802, MAX11803: Typical Operating Circuits MAX11800, MAX11801, MAX11802, MAX11803: Typical Operating Circuits Enlarge+

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

CAD Symbols and Footprints

  • MAX11801ETC+
  • MAX11801ETC+T
  • MAX11801GTC/V+
  • MAX11801GTC/V+T
  • Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C  

    Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

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