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MAS6505 Datasheet(PDF) 1 Page - Micro Analog systems |
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MAS6505 Datasheet(HTML) 1 Page - Micro Analog systems |
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1 / 44 page  DA6505.005 11 June 2018 1 (44) MAS6505 Piezoresistive Sensor Signal Interface IC • Optimized for Piezoresistive Pressure Sensors • Very Low Power Consumption • 1.71V Supply Voltage Operation • Very Low Noise Analog Front-End • Ratiometric ADC • SPI and I2C Bus • 512 Bit EEPROM Calibration Memory DESCRIPTION MAS6505 is a piezoresistive sensor signal interface IC with a low noise analog front-end (AFE) and an Analog-to-Digital Converter (ADC). The AFE comprises of a low noise chopper amplifier with 32 selectable gain options from 1x up to 55.8x and an input signal polarity selection. The ADC employs delta-sigma ( ΔΣ) A/D conversion technique with seven oversampling ratio (OSR) options for optimization between speed, power consumption and resolution. The ADC’s 1-sigma noise resolution is up to 17.9 bits in the 1400 mV input signal range (ISR) of the ADC. Additionally the ADC has eight input offset options with both polarities to match input signal range with different sensor signals. The sensor input 1-sigma noise resolution is down to 0.27 Vrms which can be further reduced with four digital low pass filtering options. MAS6505 has one input channel suitable for a piezoresistive pressure sensor. In addition to pressure measurement the device can be configured for temperature measurement. The temperature can be measured either by sensing temperature dependence of the sensor bridge resistance or using an external temperature sensing diode. The gain and offset settings can be configured independently for the both measurements. MAS6505 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 from 1.3 µA up to 25 µA (one pressure and temperature A/D conversion in a second) can be achieved depending on selected resolution setting. A serial bus compatible with 4-wire or 3-wire SPI bus or 2-wire I2C bus is used for configuring and starting measurements and reading out the results. The measurements can be run either at forced mode (single command based measurement) or at normal mode (automated measurements) at eight different output rates with selectable delays between measurement from 0.5ms up to 4000ms. An internal clock oscillator makes external clock unnecessary. The 512-bit EEPROM memory is available for storing trimming and sensor calibration data on chip. MAS6505 outputs raw measurement results and calibrated and temperature compensated results need to be calculated in the application host system using the sensor calibration data. FEATURES APPLICATIONS • Supply Voltage 1 .71 V…5.5 V • Low Sleep Current Consumption 42nA Typ • Very Low Operating Current 1.3 µA…25 µA Typ • Very Low Noise Analog Front-End 0.27 µVrms • Ratiometric ΔΣ A/D Conversion • A/D Conversion Time 1.25 ms…40.02 ms Typ • Sensor Resistance Range 3 k 6 k • Seven Resolution Options by OSR Selection • Internal Clock Oscillator • 2-Wire Serial Data Interface (I2C Bus) • 4- and 3-Wire Serial Peripheral Interface Bus • 512 Bit EEPROM Memory • Digital Piezoresistive Pressure Modules • Altimeter and Barometer • Temperature measurement • Battery Powered Systems • Navigation systems • Industrial and Process Control Applications |
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