L3G4200D 데이터 시트보기 (PDF) - STMicroelectronics

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L3G4200D

MEMS motion sensor: three-axis digital output gyroscope

STMicroelectronics 

Digital interfaces

L3G4200D

The SPI Write command is performed with 16 clock pulses. Multiple byte write command is

performed adding blocks of 8 clock pulses at the previous one.

bit 0: WRITE bit. The value is 0.

bit 1: MS bit. When 0 do not increment address, when 1 increment address in multiple

writing.

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 inside the device

(MSb first).

bit 16-... : data DI(...-8). Further data in multiple byte writing.

Figure 11. Multiple bytes SPI write protocol (2 bytes example)

CS

SPC

SDI

DI7 DI6 DI5 DI4 DI3 DI2 DI1 DI0 DI15 DI14 DI13 DI12 DI11 DI10 DI9 DI8

RW

MS AD5 AD4 AD3 AD2 AD1 AD0

5.2.3

SPI read in 3-wires mode

3-wires mode is entered by setting to 1 bit SIM (SPI serial interface mode selection) in

CTRL_REG2.

Figure 12. SPI read protocol in 3-wires mode

CS

SPC

SDI/O

RW

DO7 DO6 DO5 DO4 DO3 DO2 DO1 DO0

MS 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: MS bit. When 0 do not increment address, when 1 increment address in multiple

reading.

bit 2-7: address AD(5:0). This is the address field of the indexed register.

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

first).

Multiple read command is also available in 3-wires mode.

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Doc ID 17116 Rev 1

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