Features and Benefits
- 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
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.
- Automotive Center Consoles
- Devices, Media Players
- Handheld Games
- Mobile Communication Devices
- PDAs, GPS Receivers, Personal Navigation
- Portable Instruments
- POS Terminals
Product Lifecycle Not Recommended for New Designs
This designates products ADI does not recommend broadly for new designs.
Documentation & Resources
MAX11800 Reliability Data1/12/202333K
An Easy-to-Understand Explanation of Calibration in Touch-Screen Systems5/7/2012
Tutorial: Improve Sensor Performance and SNR in Pulse Oximeter Designs6/21/2010
Introduction to Spirometers and Important Design Considerations for Selecting Electrical Components5/10/2010
How Continuous Positive Airway Pressure (CPAP) Respiratory Ventilation Systems Function5/10/2010
Introduction to Digital Stethoscopes and Electrical Component Selection Criteria5/10/2010
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal.
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