LSM9DS1 datasheet(36/72 Pages) STMICROELECTRONICS

Part #	LSM9DS1

Description	iNEMO inertial module: 3D accelerometer, 3D gyroscope, 3D magnetometer

PDF	72 Pages

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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36 / 72 page

Digital interfaces

LSM9DS1

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DocID025715 Rev 3

5.3.2

SPI write

Figure 25. Magnetic sensor SPI write protocol

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

is performed by adding blocks of 8 clock pulses to the previous one.

bit 0: WRITE bit. The value is 0.

bit 1: MS bit. When 0, does not increment the address; when 1, increments the address in

multiple writes.

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 inside the device (MSb

first).

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

Figure 26. Multiple byte SPI write protocol (2-byte example)

SPC

SDI

DI7 D I6 DI5 D I4 DI3 DI2 DI1 DI0

AD5 AD 4 AD 3 AD2 AD 1 AD0

CS_M

SPC

SDI

AD5 AD4 AD3 AD2 AD1 AD 0

DI7 D I6 DI5 D I4 DI3 DI2 DI1 DI0 DI15 D I1 4

DI13 D I1 2 DI11 DI10DI9 DI8

CS_M

SPC

SDI

LSM9DS1 Datasheet(PDF) 36 Page - STMicroelectronics