The MAX11811 low-power touch-screen controller operates from a 1.7V to 3.6V single supply targeting power-sensitive applications such as handheld equipment. The device contains a 12-bit SAR ADC and a multiplexer to interface with a resistive touch-screen panel. A digital serial interface provides communications.
The MAX11811 includes digital preprocessing of the touch-screen measurements, reducing bus loading and application processor (AP) resource requirements. The included smart interrupt function generator greatly reduces the frequency of interrupt servicing to the device. The MAX11811 enters low-power mode automatically between conversions to save power, making the device ideal for portable applications.
The MAX11811 offers two modes of operation: direct and autonomous. Direct mode allows the application processor to control all touch-screen controller activity. Autonomous mode allows the MAX11811 to control touch-screen activity, thereby freeing the application processor to perform other functions. In autonomous mode, the device periodically scans the touch screen for a touch event 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 and increase effective data throughput and lower system power.
The MAX11811 supports 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 MAX11811 features a haptic driver to either drive a vibration motor directly or to interface with an external piezo actuator driver. The device generates PWM signals that can drive the MAX11835 haptic piezo controller. The device includes a general-purpose current DAC output and a general-purpose input that can be used to drive IR and visible LEDs, as well as IR photo-detectors in applications such as proximity detectors.
The MAX11811 supports the I²C serial bus. The MAX11811ETP+ is available in a 20-pin TQFN package and is specified over the extended industrial temperature range of -40°C to +85°C. The MAX11811GTP/V+ is specified over the -40°C to +105°C automotive temperature range.
4-Wire Touch-Screen Interface
X/Y Coordinate Measurement and Touch Pressure 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
General-Purpose Current DAC Output
Integrated Proximity Sensing System
Integrated Motor Haptic Driver*
PWM Output for MAX11835 Haptic Piezo Controller† (HPC)
400kHz I²C Interface
20-Pin, 4mm x 4mm TQFN
250µW at VDD = 1.7V, 34.4ksps
±8kV HBM (X+, X-, Y+, Y-)
Automotive Center Consoles
Digital Photo Frame
Digital Still Camera
Digital Video Camera
Mobile Communication Devices
PDA, GPS Receivers, Personal Navigation Devices, Media Players
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