WF WF282A

The WF282A is a miniaturized Digital Barometric Air Pressure Sensor with a high accuracy and a low current consumption. The WF282 is both a pressure and a temperature sensor. The pressure sensor element is based on a capacitive sensing principle which guarantees a high precision during temperature changes. The small package makes the WF282 ideal for mobile applications and wearable devices. The WF282A's internal signal processor converts the output from the pressure and temperature sensor elements to 24-bit results. Each pressure sensor has been calibrated individually and contains calibration coefficients. The coefficients are used in the application to convert the measurement results to true pressure and temperature values. The WF282A has a FIFO that can store the latest 32 measurements. By using the FIFO, the host processor can remain in a sleep mode for a longer period of time between readouts. This can reduce the overall system power consumption. Sensor measurements and calibration coefficients are available through the serial I2C or SPI interface.

• Operation range: Pressure: 300 - 1200 hPa. Temperature: -40 - 85℃
• Pressure sensor precision: ±0.006 hPa (or ±5 cm) (high precision mode)
• Pressure sensor accuracy: ±0.06 hPa (or ±50 cm) (non-linearity), ±1 hPa (or ±8 m) (absolute)
• Temperature accuracy: ±0.5℃
• Pressure temperature sensitivity: < 0.5 Pa/K
• Measurement time: Typical: 28 ms. Minimum: 3 ms
• Average current consumption: High precision: 60 μA, Low power: 3 μA, Standby: < 1 μA
• Supply voltage: VDDIO: 1.2 - 3.6 V, VDD: 1.7 - 3.6 V
• Operating modes: Command (manual), Background (automatic), and Standby
• Calibration: Individually calibrated with coefficients for measurement correction
• FIFO: Stores latest 32 pressure or temperature measurements
• Interface: I2C and SPI (both with optional interrupt)
• Package dimensions: 8-pin LGA, 2.0 mm × 2.5 mm × 0.95 mm

• Indoor Navigation (floor detection e.g. in shopping malls and parking garages)
• Health and Sports (accurate elevation gain and vertical speed)
• Outdoor Navigation (GPS start-up time and accuracy improvement, dead-reckoning e.g. in tunnels)
• Weather Station ('Micro-weather' and local forecasts)