Piezo analog front-end ASIC for haptic touch

Piezo analog front-end ASIC for haptic touch

Screen based human-machine interfaces require a feedback to the user. Haptic touch feedback is a popular way to accomplish this. This mixed-signal ASIC generates high-voltage pulses to drive/sense the piezo elements that create the feeling of touch. It can be used in an automotive environment.

Features

  • Application: Replacement of mechanical buttons, touch control interfaces, …
  • Control and generation of high-voltage piezo drivers
    • Fast settling boost DCDC converter: 1.8-5.5/12V supply to 0-to-200V haptic pulse
    • Voltage rise time below 500ns
    • Low frequent signals (below 250Hz)
    • Digital control of voltage booster and analog feedback
    • Well controlled/soft start, voltage regulation, controlled shut-down
    • High-voltage switches
  • Sense and preconditioning of piezo elements: low-level signal preconditioning incl. low-pass anti-alias filter, attenuation and wake-up detection
  • On-chip protection against ESD, over-current, over/under-voltage, over-temperature
  • 0.5 SOI technology
pdf

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