LSM9DS1 datasheet(35/72 Pages) STMICROELECTRONICS

Part #	LSM9DS1

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

PDF	72 Pages

Scroll/Zoom	100%

Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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35 / 72 page

DocID025715 Rev 3

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LSM9DS1

Digital interfaces

5.3.1

SPI read

Figure 23. Magnetic sensor SPI read protocol

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

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

bit 0: READ bit. The value is 1.

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

multiple reads.

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 will be read from the device (MSb

first).

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

Figure 24. Multiple byte SPI read protocol (2-byte example)

SPC

SDI

SD O

DO 7 DO 6 DO 5 DO 4 DO 3 DO 2 DO 1 DO 0

AD5 A D4 AD 3 A D2 AD1 A D0

DO 15DO 14DO 13 DO 12DO 11DO 10D O9 D O8

CS_M

SDO_M

LSM9DS1 Datasheet(PDF) 35 Page - STMicroelectronics