參數(shù)資料
型號(hào)： LSM330DL
廠商： STMICROELECTRONICS
元件分類： 模擬信號(hào)調(diào)理
英文描述： SPECIALTY ANALOG CIRCUIT, PBGA28
封裝： 7.50 X 4.40 MM, 1.10 MM HEIGHT, GREEN, PLASTIC, LGA-28
文件頁數(shù)： 17/54頁
文件大?。?/td> 1064K
代理商： LSM330DL
Digital interfaces
LSM330DL
24/54
Doc ID 022018 Rev 1
5.2
SPI bus interface
The LSM330DL SPI is a bus slave. The SPI allows to write and read the registers of the
device.
The Serial Interface interacts with the outside world with 4 wires: CS, SPC, SDI and SDO
(SPC, SDI, SD0 are common).
Figure 6.
Read and write protocol
CS is the serial port enable and it 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. These 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 read/write bytes. 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 into 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 will remain 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 into 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 increased at every block.
The function and the behavior of SDI and SDO remain unchanged.
CS
SPC
SDI
SDO
RW
AD5 AD4 AD3 AD2 AD1 AD0
DI7DI6 DI5DI4 DI3DI2 DI1DI0
DO7DO6 DO5DO4 DO3DO2 DO1DO0
MS
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