Piezo resistive sensor signal interface IC
18 October 2011
Low Power piezo resistive sensor signal interface IC targeted for MEMS-based pressure sensor modules.
Micro Analog Systems has announced MAS6502, a 16-bit piezo resistive sensor signal interface IC primarily intended for MEMS-based pressure sensor modules.
The device uses a ratiometric AD-converter principle employing a delta-sigma (ΔΣ) conversion technique, giving very good noise performance. Its current consumption is extremely low (2.3 μA ) and it can operate at low supply voltage from 2.0 V to 3.6 V which makes it an ideal solution for interfacing a piezo-resistive sensor in power consumption critical portable applications.
The effective number of bits (ENOB) of the ADC is 14-bits. The over sampling ratio (OSR) of the ΔΣ-converter has four values to choose from for further optimization between conversion accuracy, speed and current consumption. The external sensor bridge can be used to sense not only pressure but also temperature, using the built-in sensor sampling switches. The MAS6502 communicates via a standard 2-wire I2C serial bus interface.
MAS6502 is available in a QFN-16 package as well as tested wafers or dies in waffle pack.
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