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Data Acquisition - Touch Screen Controllers

The MAX11801GTC/V+ is a high-performance, low-power single-chip 4-wire resistive touch-screen controller, which integrates touch-screen interfacing, controller circuitry and data acquisition into a single chip solution. The MAX11801GTC/V+ is a ideal for touch-screen applications with demanding power budgets such as those found in portable electronic products. It supports end-to-end (X-Y) detection and multiple Z-axis detection methods. It also features close-to-linear resistive measurements and precision calibration.

Application Field

The MAX11801GTC/V+ is well-suited for a variety of touch-screen applications, including:

• Handheld computers
• Visible light communication(VLC) devices
• Electron microscopes
• Embedded touch-screens
• Industrial control systems
• Test and measurement equipment
• Enclosed touch-screen sensing
• Medical instruments and systems
• Educational kiosks and systems

The MAX11801GTC/V+ is a perfect choice for these applications due to its low power requirements, high sensitivity, and accurate resistive measurements.

Working Principle

The MAX11801GTC/V+ measures the touch pressure by detecting the voltage drop across two electrodes when a finger or stylus contacts the touch-screen surface. It has three sensing modes: Four-Wire Mode, Four-Wire Autocal Mode, and Dual-Wire Mode. In Four-Wire Mode, the MAX11801GTC/V+ applies a charge and checks the voltage developed across the X and Y electrodes. It then measures the touch pressure at the X, Y, and Z axes. In Four-Wire Autocal Mode and Dual-Wire Mode, the controller automatically compensates for line resistance and offsets. This makes the measurements more accurate. The MAX11801GTC/V+ is also resistant to noise and electrical interference, making it suitable for noisy environments.

The MAX11801GTC/V+ supports manual sampling, periodic sampling, and windowing. In manual sampling, the chip only senses when commanded. In periodic sampling mode, the chip samples the X, Y, and Z axes at regular intervals. The MAX11801GTC/V+ also provides windowing, which allows the chip to save power by only senses when the finger is within a pre-defined window. This mode can save up to 90% of power consumption.

The MAX11801GTC/V+ also features an optional digital filter that can be used to reduce noise and improve the accuracy of the touch-screen measurements. It also supports temperature compensation, which allows the chip to continue functioning at a wide temperature range.

The MAX11801GTC/V+ is an ideal single-chip solution for a variety of touch-screen applications, providing low power requirements, high sensitivity, and accurate resistive measurements. It is also resistant to noise and electrical interference, making it suitable for noisy environments. It supports manual, periodic, and windowing operation, and can be used with an optional digital filter to reduce noise and improve accuracy.

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