LSM9DS0 datasheet(34/74 Pages) STMICROELECTRONICS

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Digital interfaces

LSM9DS0

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DocID024763 Rev 2

6.2

SPI bus interface

The SPI is a bus slave. The SPI allows writing and reading the registers of the device.

The serial interface interacts with the outside world through 4 wires: CS, SPC, SDI and

SDO.

Figure 12. Read and write protocol

CS is the Serial Port Enable and is controlled by the SPI master. It goes low at the start of

the transmission and goes back high at the end. SPC is the Serial Port Clock and it is

controlled by the SPI master. It is stopped high when CS is high (no transmission). SDI and

SDO are respectively the Serial Port Data Input and Output. Those lines are driven at the

falling edge of SPC and should be captured at the rising edge of SPC.

Both the Read Register and Write Register commands are completed in 16 clock pulses or

in multiples of 8 in case of multiple bytes read/write. Bit duration is the time between two

falling edges of SPC. The first bit (bit 0) starts at the first falling edge of SPC after the falling

edge of CS while the last bit (bit 15, bit 23, ...) starts at the last falling edge of SPC just

before the rising edge of CS.

bit 0: RW bit. When 0, the data DI(7:0) is written to the device. When 1, the data DO(7:0)

from the device is read. In the latter case, the chip will drive SDO at the start of bit 8.

bit 1: MS bit. When 0, the address remains unchanged in multiple read/write commands.

When 1, the address will be auto-incremented in multiple read/write commands.

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 8-15: data DO(7:0) (read mode). This is the data that will be read from the device (MSb

first).

In multiple read/write commands, further blocks of 8 clock periods will be added. When the

MS bit is 0, the address used to read/write data remains the same for every block. When the

MS bit is 1, the address used to read/write data is incremented at every block.

The function and the behavior of SDI and SDO remain unchanged.

SPC

SDI

SDO

AD5 AD4 AD3 AD2 AD1 AD0

DI7 DI6 DI5 DI4 DI3 DI2 DI1 DI0

DO7DO6 DO5DO4 DO3DO2 DO1DO0

AM10129V1

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