Sensor Signal Interfaces

MAS

Micro Analog Systems – Sensor Signal Conditioning ICs

MAS1641 Capacitance Change Detection with Piezo Alarm

The MAS1641 is a very low power single chip solution for a capacitance change detection and a piezo alarm. Typical applications include battery powered alarm systems detecting infusion liquid level drop or water leakage.

It can be configured to detect either capacitance reduction or increase over a threshold which is adjustable by external resistors. A very high sound pressure level (SPL) alarm is achieved by voltage boosting solution which is based on an inductor free, low EMI and high efficiency 3x charge pump. The output driver stage can drive up to 18Vpp intermittent alarm signal to the piezo just from a low 3V supply. It can operate from a low supply voltage down to 2.25V and it draws only a very low 36uA current when monitoring capacitance change. The MAS1641 is available in a small QFN-16 3x3x0.75 mm package.

Features

  • For Self-Drive Type Piezoelectric Sounders
  • Very Low Current Consumption, typ 36uA
  • Up to 18Vpp Piezo Drive from 3V Supply
  • Low Voltage Operation, min 2.25V
  • High Efficiency
  • Low External Part Count
  • Low Profile and Small Size
  • Thin 3x3x0.75 mm QFN-16 Package

Applications

  •  Infusion liquid level drop detection and alarm
  • Capacitive water leakage detection and alarm
  • Capacitance change detection and alarm


MAS6502 Piezoresistive Sensor Signal Interface IC

MAS6502 is a 16 bit Analog-to-Digital Converter (ADC) designed for piezoresistive sensor modules. It’s designed especially to meet the requirement for low power consumption, thus making it an ideal choice for battery powered systems.  Current consumption values of 2.3 µA (one pressure conversion in a second) or less can be achieved. The 256-bit EEPROM memory stores trimming and calibration coefficients on chip.

In addition to pressure measurement the device can be configured for temperature measurement using the external sensor bridge and the built-in sensor sampling switches. An advantage with this is that the temperature is measured directly on the bridge and not on the IC which means the IC doesn’t need to be placed directly beside the sensor bridge.

Features

  • Low Current Consumption; 0.35μA – 2.3μA
  • Low Supply Voltage Operation, min 2.0V
  • 14-bits Accuracy (ENOB)
  • 2-Wire I2C Serial Bus Interface
  • 256-bit EEPROM memory stores trimming and calibration coefficients on chip.
    373, 252, 172 and 115 mVPP
  • Selectable Sensor Resistance Values 5 kΩ, 4.5 kΩ, 4 kΩ, 3.4 kΩ
    ±126, ±86, ±57 and ±40 mV
  • Internal Clock Oscillator

Applications

  • MEMS Pressure sensor modules
  • Temperature sensor modules
  • Humidity sensor modules


MAS6505 22-bit Low Power Low Noise Piezoresistive Sensor Signal Interface IC

MAS6505 is a high resolution sensor signal interface IC designed for piezoresistive sensor modules. Analog Front-End (AFE) comprises of a chopper amplifier having input noise down to 0.27uVrms. The 22-bit Analog-to-Digital Converter (ADC) employs delta-sigma conversion technique with high resolution performance. It can operate from a very wide range of supply voltages (1.71V…5.5V) and it has extremely low current consumption (down to 0.8uA, one measurement in a second) which make it an ideal solution for battery powered applications. Temperature sensing either from sensor bridge resistance or external diode are both supported. 512-bit EEPROM memory is available for storing sensor trimming and calibration coefficients on chip. The device is operated using standard I2C and SPI serial bus interfaces.

Features

  • 22-bit ratiometric ADC + chopper AFE
  • IIR filter options: 2, 4, 8, 16
  • Supply Voltage 1.71 V … 5.5 V
  • Low Sleep Current Consumption 24 nA Typ
  • Very Low Operating Current 1.3 uA … 25 uA Typ
  • Very Low Noise Analog Front-End 0.27 uVrms
  • Ratiometric ΔΣ A/D Conversion
  • A/D Conversion Time 1.25 ms … 40 ms Typ
  • Sensor Resistance Range 3 kOhm 6 kOhm
  • Seven Resolution Options by OSR Selection
  • Internal Clock Oscillator
  • 2-Wire Serial Data Interface (I2C Bus)
  • 4- and 3-Wire Serial Peripheral Interface (SPI Bus)
  • 512 Bit EEPROM Memory

Applications

  • Digital Piezoresistive Pressure Modules
  • Altimeter and Barometer
  • Temperature measurement
  • Battery Powered Systems
  • Navigation systems
  • Industrial and Process Control Applications


MAS6512 Capacitive Sensor Signal Interface IC

MAS6512 is a capacitive sensor signal conditioner IC, capable to interface both single and differential capacitance sensors. It uses a 16-bit Capacitance-to-Digital Converter, which employs a delta-sigma (ΔΣ) conversion technique. The output can be proportional either to capacitance difference or to capacitance ratio. The IC is designed especially to meet the requirement for low power consumption, thus making it an ideal choice for battery powered systems.

In addition to capacitance measurement the device has an internal temperature sensor for temperature measurement and temperature compensation purposes. The 256-bit EEPROM memory stores trimming and calibration coefficients on chip.

Features

  • Single and Differential Capacitance Sensors
  • Low Voltage Operation, min 1.8V
  • Low Power Consumption
  • On Chip Temperature Sensor
  • Internal Clock Oscillator
  • 16-Bit Ratiometric ΔΣ CDC
  • EEPROM Calibration Memory
  • Serial Interface, I2C / SPI

MAS6510 Capacitive Sensor Signal Conditioner IC

MAS6510 is a capacitive sensor signal conditioner IC, capable to interface both single and differential capacitance sensors. It uses a 24-bit Capacitance-to-Digital Converter, which employs a delta-sigma (ΔΣ) conversion technique. The output can be proportional either to capacitance difference or to capacitance ratio. The IC is designed especially to meet the requirement for low power consumption, thus making it an ideal choice for battery powered systems.

In addition to capacitance measurement the device has an internal temperature sensor for temperature measurement and temperature compensation purposes. The 256-bit EEPROM memory stores trimming and calibration coefficients on chip.

Features

  • Single and Differential Capacitance Sensors
  • Low Voltage Operation, min 1.8V
  • Low Power Consumption
  • On Chip Temperature Sensor
  • Internal Clock Oscillator
  • 24-Bit Ratiometric DS CDC
  • EEPROM Calibration Memory
  • Serial Interface, I2C / SPI

Applications

  • MEMS Pressure sensor modules
  • Humidity sensor modules
  • Medical Devices
  • Flow Meters
  • Altimeter and Barometer Systems


MAS6513 capacitive sensor interface IC

The MAS6513 capacitive sensor interface IC can interface both single and dual capacitance sensors.

It uses a 24-bit Capacitance-to-Digital Converter (CDC), which employs a delta-sigma (ΔΣ) conversion technique. The output data from the high order ΔΣ-modulator is processed by an on-chip decimator filter, producing a high resolution conversion result. The converter is run by an internal clock oscillator making an external converter clock unnecessary.

The IC is designed especially to meet the requirement for low power consumption, thus making it an ideal choice for battery powered systems. Overall current consumption values down to 0.65 μA (one temperature and capacitance A/D conversion in a second) can be achieved depending on selected resolution setting.

The built-in 24-bit DSP block includes IIR filter options and a calculation engine which performs calculation of calibrated and temperature compensated sensor and temperature readings.

Features

  • Sensor Offset and Gain Adjustment
  • 24-bit ratiometric CDC/ADC
  • 24-bit compensation calculation
  • IIR Filter for T- and C-Signals
  • Current consumption down to 0.65µA
  • 15aF rms input noise
  • Internal Clock Oscillator
  • On Chip Temperature Sensor -40°C to 125°C
  • Small DFN-12 package
  • I2C and SPI Compatible Serial Interface

Applications

  • Capacitive Pressure Sensors
  • Humidity Sensors
  • Medical Devices
  • Sport Watches
  • Altimeter and Barometer Systems
  • Mobile and Battery Powered Systems
  • Low Frequency Measurement applications
  • Current/Power Consumption Critical Systems
  • Industrial and Process Control applications
  • Flow Meters

The planned release for the MAS6513 is Q1/2020.


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