DPS422
Digital barometric pressure & temp sensor for portable and IOT devices
V1.3
Description
The DPS422 is a miniaturized digital barometric air pressure sensor with high accuracy and low current
consumption, capable of measuring both pressure and temperature. Pressure sensing is carried out using a
capacitive sensor element, guaranteeing high accuracy over temperature. The small 2.0 x 2.5 x 0.73 mm
package makes the DPS422 ideal for mobile applications and wearable devices.
The pressure and temperature sensor elements are measured by a 24-bit ADC. Measurement results can be
accessed over I2C or SPI, with an optional configurable interrupt and a result FIFO capable of holding 32
pressure and/or temperature measurements.
Individual calibration coefficients are generated for each unit during testing, and stored in the fuse registers.
These coefficients are used in the application to convert the measurement results to high accuracy pressure
and temperature values.
Features
Operation range: Pressure: 300 1200 hPa. Temperature: -40C +85 C.
Pressure sensor precision: 0.005 hPa (or 5 cm) (high precision mode).
Relative accuracy: 0.06 hPa (or 50 cm)
Absolute accuracy: 1 hPa (or 8 m)
Temperature accuracy: 0.4C.
Pressure temperature sensitivity: < 0.5Pa/K
Measurement time: Typical: 27.6 ms for standard mode (16x). Minimum: 3.6 ms for
low precision mode.
Average current consumption: 1.7 A for pressure measurement, 2A for
temperature measurement @1Hz sampling rate, Standby: <1 A.
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 up to 32 pressure or temperature measurements. Streaming or stop-on-
full mode. Optional interrupt on full or watermark interrupt.
2
Interface: I C with optional interrupt, 4-wire SPI, 3-wire SPI with optional interrupt.
Package dimensions: 8-pin LGA, dimensions: 2.0 x 2.5 x 0.73 mm (typ).
Green Product (RoHS) Compliant
Typical applications
Local weather station and Thermostat ( Micro weather forecasting; room temperature control)
Air flow control (Smart filter replacement, e.g. in whitegoods; Servers CPU ventilation control)
Health and sports (Accurate elevation gain and vertical speed detection, e.g. for smart watches)
Outdoor navigation (GPS start-up time and accuracy improvement; dead-reckoning e.g. in tunnels)
Indoor navigation ( Floor detection e.g. in shopping malls and parking garages)
Smart Home ( Intruder detection and environmental monitoring of premises)C
Datasheet Please read the Important Notice and Warnings at the end of this document
www.infineon.com 2018-08-02DPS422
Digital barometric pressure & temp sensor for portable and IOT devices
Product validation
Product validation
Qualified for industrial applications according to the relevant tests of JEDEC47/20/22.
Definitions
An explanation of the terms and definitions used in this datasheet.
Table 1 DPS422 Defintions
Term Definition/explanation
Absolute accuracy The absolute measurement accuracy over the entire measurement
range.
Digital bit depth The total bit depth used for conversion of the sensor input to the
digital output. Measured in bits.
Digital resolution The pressure value represented by the LSB change in output. This
value should be much smaller than the sensor noise.
Full Scale Range (FSR) The peak-to-peak measurement range of the sensor.
LSB Least Significant Bit
Measurement time The time required to acquire one sensor output result. This value
determines the maximum measurement rate.
MSB Most Significant Bit
Non-linearity The deviation of measured output from the best-fit straight line,
relative to 1000 hPa and 25 C.
Output compensation The process of applying an algorithm to the sensor output to improve
the absolute accuracy of the sensor across temperature and to
minimize unit to unit output variation. This algorithm makes use of
both the temperature sensor readings and the individual calibration
coefficients.
Precision (noise) The smallest measurable change, expressed as rms, after sensor
oversampling.
Pressure temperature coefficient The pressure measurement deviation, after compensation, from
expected measurement value due to temperature change from 25 C.
Measured in Pa/K.
Sensor calibration The process, during the production test, where the sensor's
measurement results are compared against reference values, and a set
of calibration coefficients are calculated from the deviation. The
coefficients are stored in the sensor's memory and are used in the
output compensation.
Sensor oversampling rate (OSR) Specifies the number of sensor measurements used internally to
generate one sensor output result.
Datasheet 2
2018-08-02