LSM303C Datasheet, PDF (27/53 Pages) –

LSM303C
Digital interfaces
6.2.1
Accelerometer SPI write
Figure 9. Accelerometer SPI write protocol
CS
SPC
SDI
RW
DI7 DI6 DI5 DI4 DI3 DI2 DI1 DI0
AD6 AD5 AD4 AD3 AD2 AD1 AD0
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 -7: address AD(6:0). 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 10. Multiple byte SPI write protocol (2-byte example)
CS
SPC
SDI
DI7 DI6 DI5 DI4 DI3 DI2 DI1 DI0 DI15 DI14 DI13 DI12 DI11 DI10 DI9 DI8
RW
AD6 AD5 AD4 AD3 AD2 AD1 AD0
6.2.2
Accelerometer SPI read in 3-wire mode
Figure 11. Accelerometer SPI read protocol in 3-wire mode
CS
SPC
SDI/O
RW
DO7 DO6 DO5 DO4 DO3 DO2 DO1 DO0
AD6 AD5 AD4 AD3 AD2 AD1 AD0
The SPI read command is performed with 16 clock pulses:
bit 0: READ bit. The value is 1.
bit 1-7: address AD(6:0). This is the address field of the indexed register.
DocID024975 Rev 2
27/53
53