Capacitance-to-Digital Converter with Integrated Signal Processor

  • Up to 8 capacitances in grounded mode
  • Up to 4 capacitances in floating mode (potential-free and with zero bias voltage)
  • Compensation of internal (grounded) and external parasitic capacities (floating)
  • High resolution: Up to 23 aF at 5 Hz and 10 pF base capacitance (corresponds to 18.7 bits resolution)
  • High measurement rate, up to 500 kHz
  • Extremely low current consumption possible, down to 2 µA at 3 Hz with 13.1 bit resolution
  • Internal temperature measurement (25 mK resolution) or dedicated ports for precision temperature measurement with Pt1000 sensors (5 mK resolution)
  • Serial peripheral interface (SPI compatible), now with multi-slave capability
  • Inter-Integrated Circuit Interface (I2C compatible), now with auto-increment
  • Integrated reference capacitor (1pF to 31pF)
  • Enlarged set of discharge resistor up to 1 MOhm (for humidity sensors)
  • Two internal discharging resistor sets to operate two different sensors (Combo sensors)
  • Pre-Charge option for slow charging to reduce mechanical stress (for MEMS sensors)
  • Integrated low-power clock and high-speed oscillator
  • Self-test capability for differential sensors (for e.g. MEMS)
  • RISC processor core using Harvard architecture: ƒƒ80 x 48 bit RAM Data
  • 4k x 8 bit volatile program memory for highspeed operation (40 to 85 MHz)
  • 4k x 8 bit non-volatile (OTP) program memory
  • Integrated 128 bytes EEPROM for calibration data
  • PDM and PWM output up to 16 bit
  • Single power supply (2.1 to 3.6 V)
  • QFN32 package or Dice

bold = new features compared with PCap01