Touch Screen Controllers

Purpose: Manage touch input from resistive or capacitive touchscreens, translating physical touch into digital coordinates.

• Types:
  • Resistive: Detects pressure (e.g., TI TSC2046)
  • Capacitive: Detects finger capacitance (e.g., Microchip CAP12xx, Synaptics AS3528)
• Interfaces: I²C, SPI, USB
• Features: Multi-touch support, gesture recognition, noise suppression, low-power modes
• Integration: Often paired with MCU/MPU; some include built-in drivers for OS integration (e.g., Linux input subsystem)

Note: Modern controllers support self/ mutual capacitance sensing and coordinate filtering for accuracy.