LPS331APTR datasheet(14/36 Pages) STMICROELECTRONICS

Part #	LPS331APTR

Description	MEMS pressure sensor: 260-1260 mbar absolute digital output barometer

PDF	36 Pages

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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14 / 36 page

Digital interfaces

LPS331AP

14/36

Doc ID 022112 Rev 7

Figure 6.

Multiple bytes SPI read protocol (2 bytes example)

5.3.2

SPI write

Figure 7.

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.

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

multiple writings.

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

bit 8-15: data DI(7:0) (write mode). This is the data that is written in the device (MSb first).

bit 16-... : data DI(...-8). Further data in multiple byte writings.

Figure 8.

Multiple bytes SPI write protocol (2 bytes example)

SPC

SDI

SDO

DO7DO6 DO5DO4 DO3DO2 DO1DO0

AD5 AD4 AD3 AD2 AD1 AD0

DO15DO14DO13DO12DO11DO10DO9 DO8

SPC

SDI

DI7

DI6

DI5

DI4

DI3

DI2

DI1

DI0

AD5 AD4 AD3 AD2 AD1 AD0

SPC

SDI

AD5 AD4 AD3 AD2 AD1 AD0

DI7 DI6 DI5 DI4 DI3 DI2 DI1 DI0 DI15 DI14 DI13 DI12 DI11 DI10 DI9 DI8

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