Specifications

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Figure 2.13.3-1 Silicon Microsystems SM5852 Series Piezoresistive Pressure
Sensor Chips, printed with permission pending by Silicon Microsystems Inc.
2.13.4 Airflow Measurement Conclusions
After an evaluation of different means by which to sample and measure human
respiratory airflow in the hand held breathalyzer unit, the design team arrived at
the conclusion that the piezoresisitve pressure sensor chips designed by Silicon
Microsystems would present the most optimum solution for the finished design.
Utilizing this approach allows us to select a chip with the most optimum range of
pressure sensitivity, while also delivering the flexibility of either being able to
sample the analog voltage response signal ourselves, or query the integrated
ADC over a standard serial communications bus for a result. The specifications
for successful operation require a 5Vdc input power supply, which has already
been factored into the total design, thus requiring a minimum amount of design
compensation for inclusion into the final product.