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ILPS22QSTR Datasheet(PDF) 27 Page - STMicroelectronics

Part # ILPS22QSTR
Description  Dual full-scale, 1260 hPa and 4060 hPa, absolute digital output barometer with embedded Qvar electrostatic sensor
PDF  57 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ILPS22QSTR Datasheet(HTML) 27 Page - STMicroelectronics

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7.3
SPI bus interface (CS = low)
The ILPS22QS SPI is a bus slave. The SPI allows writing to and reading from the registers of the device.
The serial interface interacts with the application using only the 3-wire SPI which is available with CS, SPC,
SDI/SDO.
Figure 17. SPI read protocol
The SPI read command is performed with 16 clock pulses. The multiple byte read command is performed by
adding blocks of 8 clock pulses to the previous one.
bit0:READ bit. The value is 1.
bit1-7:address AD(6:0). This is the address field of the indexed register.
bit8-15:data DO(7:0) (read mode). This is the data that is read from the device (MSb first).
bit16-...:data DO(...-8). Further data in multiple byte reads.
Figure 18. Multiple byte SPI read protocol (2-byte example)
ILPS22QS
SPI bus interface (CS = low)
DS13431 - Rev 3
page 27/57



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