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LSM303AGR bảng dữ liệu(PDF) 40 Page - STMicroelectronics

tên linh kiện LSM303AGR
Giải thích chi tiết về linh kiện  Ultra-compact high-performance eCompass module: ultra-low-power 3D accelerometer and 3D magnetometer
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nhà sản xuất  STMICROELECTRONICS [STMicroelectronics]
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LSM303AGR bảng dữ liệu(HTML) 40 Page - STMicroelectronics

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6.2.2
Accelerometer SPI read in 3-wire mode
3-wire mode is entered by setting the CTRL_REG4_A (23h) (SPI_ENABLE) bit equal ‘1’
(SPI serial interface read enable).
Figure 13. Accelerometer SPI read protocol in 3-wire mode
The SPI read command is performed with 16 clock pulses:
bit 0: READ bit. The value is 1.
bit 1: MS bit. When 0, does not increment the address; when 1, increments the address in
multiple reads.
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 is read from the device (MSb first).
A multiple read command is also available in 3-wire mode.
6.2.3
Magnetometer SPI write
Figure 14. 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.
CS
SPC
SDI
RW
D I7D I6
D I5D I4
DI3DI2
DI1DI0
AD5 AD 4 AD 3 AD2 AD 1 AD0
AD6



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