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1 General description

The FXPQ3115BVS is a compact, piezoresistive, absolute pressure sensor with an I2C digital interface. FXPQ3115BVS has a wide operating range of 20 kPa to 110 kPa. This sensor is ideal for inhalers, continuous positive airway pressure (CPAP) masks, or other medical devices coming in contact with a patient's airway. The MEMS and ASIC die are coated with a biomedically approved gel. The gel is a nontoxic, nonallergenic elastomer which meets all United States Pharmacopeia (USP) biological testing class VI requirements. The gel properties allow uniform pressure transmission to the MEMS diaphragm. A high-resolution ADC provides fully compensated and digitized outputs for pressure in Pascals and temperature in °C. The compensated output is available as either barometric pressure in Pascals or as an altitude in meters. The internal processing in FXPQ3115BVS removes compensation and unit conversion load

from the system MCU, simplifying system design. FXPQ3115BVS's advanced ASIC has multiple user programmable modes such as power saving, interrupt and autonomous data acquisition modes, including programmed acquisition cycle timing, and poll-only modes. Typical active supply current is 40 μA per measurement-second.

2 Features and benefits

? Operating range: 20 kPa to 110 kPa absolute pressure

? Calibrated range: 50 kPa to 110 kPa absolute pressure

? Calibrated temperature output: ?40 °C to 85 °C

? I2C digital output interface

? Fully compensated internally

? Precision ADC resulting in 1.5 Pa of effective resolution

? Direct reading

– Pressure: 20-bit measurement (Pascals)

– 20 kPa to 110 kPa

– Temperature: 12-bit measurement (°C)

– –40 °C to 85 °C

? Programmable interrupts

? Autonomous data acquisition

– Embedded 32-sample FIFO

– Data logging up to 12 days using the FIFO

– One-second to nine-hour data acquisition rate

? 1.95 V to 3.6 V supply voltage, internally regulated

? 1.6 V to 3.6 V digital interface supply voltage

? Operating temperature from ?40 °C to +85 °C

3 Applications

? Inhalers/nebulizers

? Medical tablets

? Health activity monitors

? Oxygen concentrators

? CPAP machine and mask

? Spyrometry