LIS3MDL datasheet(22/33 Pages) STMICROELECTRONICS

Part #	LIS3MDL

Description	Digital output magnetic sensor: ultra-low-power, high-performance 3-axis magnetometer

PDF	33 Pages

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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22 / 33 page

Digital interfaces

LIS3MDL

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DocID024204 Rev 4

5.2.3

SPI read in 3-wire mode

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

CTRL_REG3 (22h).

When 3-wire mode is used, the SDO/SA1 pin has to be connected to GND or Vdd_IO.

Figure 11. 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.

SPC

SDI/O

D O7D O6 D O5DO4 DO3DO2 DO1DO0

AD5 AD 4 AD 3 AD2 AD1

AD 0

AM10134V1

LIS3MDL Datasheet(PDF) 22 Page - STMicroelectronics