ILPS22QSTR datasheet(52/57 Pages) STMICROELECTRONICS

52 / 57 page

Contents

Block diagrams ....................................................................3

Pin description ....................................................................4

Mechanical and electrical specifications ...........................................5

3.1

Mechanical characteristics ....................................................... 5

3.2

Electrical characteristics......................................................... 7

3.3

Communication interface characteristics ........................................... 9

3.3.1

SPI - serial peripheral interface .............................................. 9

3.3.2

I²C - inter-IC control interface .............................................. 10

3.4

Absolute maximum ratings...................................................... 11

Functionality .....................................................................12

4.1

Sensing element .............................................................. 12

4.2

IC interface................................................................... 12

4.3

Factory calibration............................................................. 12

4.4

Interpreting pressure readings................................................... 13

4.5

Interpreting temperature readings................................................ 14

FIFO..............................................................................15

5.1

Bypass mode ................................................................. 16

5.2

FIFO mode................................................................... 17

5.3

Continuous (dynamic-stream) mode.............................................. 18

5.4

Bypass-to-FIFO mode ......................................................... 19

5.5

Bypass-to-continuous (dynamic-stream) mode ..................................... 20

5.6

Continuous (dynamic-stream)-to-FIFO mode ...................................... 21

5.7

Retrieving data from FIFO ...................................................... 21

Application hints .................................................................22

6.1

Analog hub (AH) / Qvar functions ................................................ 24

6.2

Power-saving tip for the pressure sensor, disabling the analog hub (AH) / Qvar feature ... 24

6.3

Soldering information .......................................................... 24

Digital interfaces .................................................................25

7.1

Serial interfaces............................................................... 25

7.2

I²C serial interface (CS = high) .................................................. 25

7.2.1

I²C operation ........................................................... 26

7.3

SPI bus interface (CS = low) .................................................... 27

7.3.1

SPI write in 3-wire mode .................................................. 28

7.3.2

SPI read in 3-wire mode .................................................. 29

ILPS22QS

Contents

DS13431 - Rev 3

page 52/57

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