MTCH112-I/MF

The Microchip mTouch MTCH112 Dual Channel Proximity/Touch Controller provides an easy way to add proximity and/or touch sensor detection to any application. The device implements either two capacitive sensors or one sensor and one active guard driver. The optional device configuration through I2C allow presets to be loaded in a production environment. Automatic calibration routines are used by default to choose the best options, so user configuration is not required. The MTCH112 uses a sophisticated optimization algorithm to actively eliminate noise from the signal. While the noise level is being measured, the requirements for a proximity or touch detection are updated to reflect the degree of uncertainty in the readings. When a press is detected for the first time, the threshold is automatically calibrated to choose a smart threshold for the ‘release’ and next press. This creates a system that dynamically optimizes the signalto-noise ratio for its environment.

• Capacitative Proximity Detection System:
  • High Signal to Noise Ratio (SNR)
  • Adjustable sensitivity
  • Noise Rejection Filters
  • Scanning method actively optimized to attenuate strongest noise frequencies
  • Automatic calibration with optional user presets
  • Dynamic threshold management adjusts sensitivity of sensor based on the level of environmental noise
  • Constant press calibration tracks the expected offset when the sensor is pressed and adjusts the threshold to automatically achieve the best press/release behavior
  • User-defined minimum shift" values specify the lowest amount of signal change to activate a state transition. Automatic thresholds never decrease below these settings.
  • Automatic Environmental Compensation
• No Required External Components
• Low-Power mode: Highly Configurable Low-Power mode
  • 1ms to 4s Sleep interval between sensor samples
• Response Time as Low"