Simplified Block Diagram
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- 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
- Automotive Center Consoles
- Devices, Media Players
- Handheld Games
- Mobile Communication Devices
- PDAs, GPS Receivers, Personal Navigation
- Portable Instruments
- POS Terminals
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.