LPS331AP Datasheet, PDF (15/36 Pages) STMicroelectronics – MEMS pressure sensor: 260-1260 mbar absolute digital output barometer

LPS331AP
Digital interfaces
5.3.3
SPI read in 3-wires mode
A 3-wires mode is entered by setting to ‘1’ bit SIM (SPI serial interface mode selection) in
CTRL_REG4.
Figure 9. 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 the address, when 1, increment the address in
multiple readings.
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).
Multiple read command is also available in 3-wires mode.
Doc ID 022112 Rev 7
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