4.7

Result Register Operation

After starting the measurements, the latest pressure and temperature raw data will be available in their

respective result registers. Temperature measurement can be skipped. The temperature measurements can be

disabled if there is a requirement to measure pressure rapidly, but it will make accurate temperature drift

compensation impossible.

All measurement data can be read in a single command using auto-increment read. When FIFO is disabled,

reading the result register will not affect the register value, it will only be updated when a new measurement is

completed. When FIFO is enabled, the pressure result register will update to the next value in the FIFO after each

read. When all of the FIFO values have been read, the result register will be set to 0x800000.

4.8

FIFO Operation

The DPS310 FIFO can store the last 32 measurements of pressure or temperature. This reduces the overall

system power consumption as the host processor does not need to continuously poll data from the sensor but

can go into standby mode for longer periods of time.

The FIFO can store any combination of pressure and temperature results, according to the background mode

measurement rate settings. The pressure rate can for instance be set 4 times higher than the temperature rate

and thus only every fifth result will be a temperature result. The measurement type can be seen in the result

data. The sensor will set the least significant bit to:

• '1' if the result is a pressure measurement.

• '0' if it is a temperature measurement.

- The sensor uses 24 bits to store the measurement result. Because this is more bits than is needed to cover

the full dynamic range of the pressure sensor, using the least significant bit to label the measurement

type will not affect the precision of the result.

The FIFO can be enabled in the Interrupt and FIFO configuration register. The data from the FIFO is read out

from the Pressure Data (PRS_Bn) registers regardless of whether the next result in the FIFO is a temperature or a

pressure measurement.

When a measurement has been read out, the FIFO will auto increment and place the next result in the data

register. A flag will be set in the FIFO Status register when the FIFO is empty and all following reads will return

0x800000.

If the FIFO is full, the FIFO_FULL bit in the FIFO Status (FIFO_STS)will be set. If the INT_FIFO bit in the Interrupt

and FIFO configuration register ( CFG_REG) is set, an interrupt will also be generated when the FIFO is full.

The FIFO will stop recording measurements results when it is full.

4.9

Calibration and Measurement Compensation

The DPS310 is a calibrated sensor and contains calibration coefficients. These are used in the application (for

instance by the host processor) to compensate the measurement results for sensor non-linearities.

The sections that follow describe how to calculate the compensated results and convert them into Pa and °C

values.

DPS310 - Digital Pressure Sensor

Digital Barometric Pressure Sensor for Portable Devices

Functional Description

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V1.0

2016-09-05