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MAS – new 24-bit sensor frontend for capacitive sensors

Micro Analog Systems Oy has started mass production of the MAS6513 – a sensor signal conditioning IC primarily intended for humidity and pressure sensor modules.

 

The MAS6513 can interface both single and dual capacitance sensors.

The built-in 24-bit DSP block includes IIR filter options and a calculation engine which performs the calculation of calibrated and temperature compensated sensor and temperature measurements. As Additional features it includes alert functions and a programmable I2C address.

The core of the IC comprises of a delta-sigma based capacitance to digital converter (CDC) with a high-resolution output (24-bit). Three different capacitance measurement modes are supported and the output can be proportional to capacitance difference (CS-CR), ratio (CS-CR)/CS or the sum (CS+CR). In addition to capacitance measurement the device has on-chip temperature sensor which can measure in the wide range of -40 °C to +125 °C.

The device operates with power supplies from 1.9 V to 5.5 V and it has an extremely low current consumption down to 0.77 μA for one capacitance and temperature measurement per second. This makes it an ideal solution for battery powered and applications with weak power supplies (e.g. wireless power).

The device includes a 512-bit EEPROM for storing capacitive sensor front-end trim values and calibration coefficients on-chip.

The MAS6513 can run measurements either command based (one shot mode) or automatically (continuous mode). The optional interrupt output can be configured that interrupts are issued when new results are available or the measurement result has exceeded programmable alert limits. Communication via standard 2-wire I2C bus and 4/3-wire SPI serial interfaces is supported.

 

The MAS6513 core features:

  • Single or Dual Capacitance Sensors
  • On-Chip Temperature Sensor -40°C…+125°C
  • 24-Bit ratiometric ΔΣ CDC
  • Built-in 24-Bit Calibration Calculation
  • IIR Filter for T- and C-Signals
  • 512 Bit EEPROM for Calibration Values
  • Optional Interrupt Output
  • Alert Function
  • Programmable Alternative I2C Device Address
  • SPI and I2C Bus
  • DFN-12 Package

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