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ILPS22QSTR Datasheet(PDF) 28 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) 28 Page - STMicroelectronics

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7.3.1
SPI write in 3-wire mode
Figure 19. SPI write protocol
CS
SPC
SDI/O
RW
DI7 DI6 DI5 DI4 DI3 DI2 DI1 DI0
AD5 AD4 AD3 AD2 AD1 AD0
AD6
The SPI write command is performed with 16 clock pulses. The multiple byte write command is performed by
adding blocks of 8 clock pulses to the previous one.
bit0:WRITE bit. The value is 0.
bit1-7:address AD(6:0). This is the address field of the indexed register.
bit8-15:data DI(7:0) (write mode). This is the data that is written in the device (MSb first).
bit16-...:data DI(...-8). Further data in multiple byte writes.
Figure 20. Multiple byte SPI write protocol (2-byte example)
CS
SPC
SDI/O
RW
AD5 AD4 AD3 AD2 AD1 AD0
DI7 DI6 DI5 DI4 DI3 DI2 DI1 DI0 DI15 DI14 DI13 DI12 DI11 DI10 DI9 DI8
AD6
ILPS22QS
SPI bus interface (CS = low)
DS13431 - Rev 3
page 28/57



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