LPS25H datasheet(18/45 Pages) STMICROELECTRONICS

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Digital interfaces

LPS25H

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DocID023722 Rev 5

5.3.1

SPI read

Figure 7. SPI read protocol

The SPI Read command is performed with 16 clock pulses. The multiple byte read

command is performed adding blocks of 8 clock pulses at the previous one.

bit 0: READ bit. The value is 1.

bit 1: MS bit. When 0 do not increment address, when 1 increment address in multiple

reading.

bit 2-7: address AD(5:0). This is the address field of the indexed register.

bit 8-15: data DO(7:0) (read mode). This is the data that is read from the device (MSb first).

bit 16-...: data DO(...-8). Further data in multiple byte readings.

Figure 8. Multiple bytes SPI read protocol (2 bytes example)

5.3.2

SPI write

Figure 9. SPI write protocol

The SPI Write command is performed with 16 clock pulses. The multiple byte write

command is performed adding blocks of 8 clock pulses at the previous one.

bit 0: WRITE bit. The value is 0.

SPC

SDI

SDO

DO7 DO6 DO5 DO4 DO3 DO2 DO1 DO0

AD5 AD4 AD3 AD2 AD1 AD0

SPC

SDI

DI7 DI6 DI5 DI4 DI3 DI2 DI1 DI0

AD5 AD4 AD3 AD2 AD1 AD0

LPS25H Datasheet(PDF) 18 Page - STMicroelectronics