Data Sheet

36/50 DocID027112 Rev 4

output registers is not updated until both MSB and LSB are read, avoiding the reading of

values related to different samples.

The RESET_AZ bit is used to reset the AutoZero function. Resetting REF_P_H (0Ah),

REF_P_L (09h) and REF_P_XL (08h) sets the pressure reference registers RPDS_H (3Ah)

and RPDS_L (39h) to the default value. RESET_AZ is self-cleared. For the AutoZero

function please refer to CTRL_REG2 (21h).

The SIM bit selects the SPI serial interface mode:

 0: (default value) 4-wire SPI interface mode selected;



1: 3-wire SPI interface mode selected.

8.7 CTRL_REG2 (21h)

Control register 2

The BOOT bit is used to refresh the content of the internal registers stored in the Flash

memory block. At device power-up the content of the Flash memory block is transferred to

the internal registers related to the trimming functions to allow correct behavior of the device

itself. If for any reason the content of the trimming registers is modified, it is sufficient to use

this bit to restore the correct values. When the BOOT bit is set to ‘1’, the content of the

internal Flash is copied inside the corresponding internal registers and is used to calibrate

76 5 4 3210

BOOT FIFO_EN STOP_ON_FTH FIFO_MEAN_DEC I2C_DIS SWRESET AUTO_ZERO ONE_SHOT

BOOT Reboot memory content. Default value: 0.

(0: normal mode; 1: reboot memory content). The bit is self-cleared when the

BOOT is completed.

FIFO_EN FIFO enable. Default value: 0.

(0: disable; 1: enable)

STOP_ON_FTH Enable the FTH_FIFO bit in FIFO_STATUS (2Fh) for monitoring of FIFO level.

Default value: 0

(0: disable; 1: enable).

FIFO_MEAN_DEC Enable to decimate the output pressure to 1Hz with FIFO Mean mode.

Default value: 0

(0: disable / 1: enable)

I2C_DIS I

C interface enabled. Default value 0.

(0: I

C enabled;1: I

C disabled)

SWRESET Software reset. Default value: 0.

(0: normal mode; 1: software reset).

The bit is self-cleared when the reset is completed.

AUTOZERO Autozero enable. Default value: 0.

(0: normal mode; 1: Autozero enabled)

ONE_SHOT One shot mode enable. Default value: 0

(0: idle mode; 1: a new dataset is acquired)