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LSM9DS0 Datasheet, PDF (36/74 Pages) STMicroelectronics – iNEMO inertial module 3D accelerometer, 3D gyroscope, 3D magnetometer
Digital interfaces
6.2.2 SPI write
Figure 15. SPI write protocol
LSM9DS0
CS
SPC
SDI
RW
D I7 D I6 D I5 D I4 DI3 DI2 DI1 DI0
MS AD5 AD 4 AD 3 AD2 AD 1 AD0
AM10132V1
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.
bit 0: WRITE bit. The value is 0.
bit 1: MS bit. When 0, does not increment address; when 1, increments 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 will be written to the device (MSb
first).
bit 16-... : data DI(...-8). Further data in multiple byte writes.
Figure 16. Multiple byte SPI write protocol (2-byte example)
6.2.3
CS
SPC
SDI
DI7 D I6 DI5 D I4 DI3 DI2 DI1 DI0 DI15 D I1 4DI13 D I1 2DI11 DI10 DI9 DI8
RW
MS AD5 AD4 AD3 AD2 AD1 AD 0
AM10133V1
SPI read in 3-wire mode
3-wire mode is entered by setting the bit SIM (SPI serial interface mode selection) to ‘1’ in
CTRL_REG2_XM (21h) for the accelerometer and magnetic sensor and in CTRL_REG4_G
(23h) for the gyroscope.
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