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ISM303DAC Datasheet(PDF) 49 Page - STMicroelectronics

Part # ISM303DAC
Description  High-performance, low-power, compact 3D accelerometer and 3D magnetometer module
PDF  80 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ISM303DAC Datasheet(HTML) 49 Page - STMicroelectronics

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ISM303DAC
Digital interfaces
80
6.2.3
Magnetometer SPI write
Figure 20. Magnetometer SPI write protocol
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 21. Magnetometer multiple byte SPI write protocol (2-byte example)
CS
SPC
SDI
RW
D I7
D I6
D I5
D I4
DI3
DI2
DI1
DI0
AD5 AD 4 AD 3 AD2 AD 1 AD0
AD6
CS
SPC
SDI
RW
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 DI10 DI9 DI8
AD6



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