Gas sensor driver/readout ASIC with integrated MCU

Gas sensor driver/readout ASIC with integrated MCU

The ASIC interfaces with the newest generation of MOX (Metal OXide) gas sensors to measure VOCs (Volatile Organic Compounds). It contains analog heater drivers, a high-precision readout chain and an embedded MSP430 microcontroller core. The ASIC is designed towards low area and ultra-low-power consumption targeted to the mobile phone market.

FEATURES

  • Fast analog drivers to heat the MOX material to up to 400°C
  • High-precision resistance measurement to detect gas concentrations
  • Time-multiplexing to minimise silicon area
  • 12-bit ADC
  • MSP430 core for increased system flexibility
    • 32 kByte Flash, 4 kByte SRAM, 512 Byte Rom
    • User-controllable timers and GPIO
    • I2C interface, 400kHz
    • Log2/Exp2 for fast calculations
    • Deep Sleep mode counter for ultra-low-power consumption
  • Temperature ranges: -40°C – 100°C
  • 0.18um CMOS (with embedded Flash)
pdf

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