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Pressure sensor selection

Question asked by Jeff Rickard on Sep 18, 2016
Latest reply on Sep 19, 2016 by Jeff Rickard


I'd like help selection an air pressure sensor chip for a new product. I'll give a summary of our requirements here:

- Size: Not critical, but we're looking for a PCB-mount chip to measure the air pressure at the chip.

- Pressure range: Normal ambient pressures at normal ground altitudes.

- Operating temperature range: Preferably at least 0-60 Celsius.

- Interface: For design simplicity, an I2C or SPI interface would be highly desirable.

- Sample rate: We need accurate data at about 10Hz, so allowing for noise I expect we need about 100Hz or higher.

- Voltage: Preferably 3.3V, but we can probably design around 1.8V or 5V.

- Power: Fairly important, preferably in the Milliampere range, but we can make allowances for more power if necessary.

- Cost: Around a couple of dollars per chip.

- Accuracy: This is critical. We do not need absolute accuracy or temperature stability, but we need to accurately measure pressure differences over a period of seconds with a resolution of 1Pa (0.001 kPa). We're well aware that this will be beyond the specifications of any chip we choose, but I believe that over a period of seconds with no need for temperature stability or stability over longer periods of time, and appropriately filtering the data to remove noise, we should be able to achieve a 1Pa resolution for measuring pressure difference at about a 10Hz rate.