LPS22DF datasheet(10/54 Pages) STMICROELECTRONICS

部件名	LPS22DF

功能描述	Low-power and high-precision MEMS nano pressure sensor: 260-1260 hPa absolute digital output barometer

PDF	54 Pages

Scroll/Zoom	100%

制造商	STMICROELECTRONICS [STMicroelectronics]

网页	http://www.st.com

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10 / 54 page

4.4

Interpreting pressure readings

The pressure data are stored in 3 registers: PRESS_OUT_H (2Ah), PRESS_OUT_L (29h), and PRESS_OUT_XL

(28h). The value is expressed as a 24-bit signed number (in 2’s complement).

To obtain the pressure in hPa, take the complete 24-bit word and then divide by the sensitivity 4096 LSB/

hPa. This same interpretation is applied to pressure readings when FIFO is enabled and the pressure

data are stored in 3 registers: FIFO_DATA_OUT_PRESS_XL (78h), FIFO_DATA_OUT_PRESS_L (79h), and

FIFO_DATA_OUT_PRESS_H (7Ah).

Figure 6. Pressure readings

(1)

PressureValue=PRESS_OUT_H2Aℎ &PRESS_OUT_L29ℎ &PRESS_OUT_XL 28ℎ =3FF58Dℎ=4191629LSB signeddecimal

(2)

Pressure ℎPA =Pressurevalue LSB

Sensitivity = 4191629LSB

4096LSB/ℎPA=1023.3ℎPA

LPS22DF

Interpreting pressure readings

DS13316 - Rev 1

page 10/54

LPS22DF 数据表(PDF) 10 Page - STMicroelectronics