ILPS22QSTR datasheet(41/57 Pages) STMICROELECTRONICS

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9.9

FIFO_CTRL (14h)

FIFO control register (R/W)

AH_QVAR_

P_FIFO_EN

STOP_ON_WTM

TRIG_MODES

F_MODE1

F_MODE0

AH_QVAR_P_FIFO_EN

Enables AH/Qvar and pressure hardware interleaved mode in FIFO buffer. Default value: 0

(0: disable; 1: enable)

STOP_ON_WTM

Stop-on-FIFO watermark. Enables FIFO watermark level use. Default value: 0

(0: disable; 1: enable)

TRIG_MODES

Enables triggered FIFO modes. Default value: 0

F_MODE[1:0]

Selects triggered FIFO modes. Default value: 00

Refer to Table 25.

The AH_QVAR_P_FIFO_EN bit enables the interleaved hardware mode in FIFO. The pressure data and the

AH/Qvar data are alternately stored in FIFO. Before enabling this mode, the device must be configured in

power-down mode and the AH_QVAR_EN bit must be set to 0. When interleaved hardware mode in FIFO is

used, both the AH_QVAR_P_AUTO_EN bit in the CTRL_REG3 (12h) register and the AH_QVAR_P_FIFO_EN bit

have to be set to 1. The least significant bit of the output data registers is set to 0 for pressure data and to 1 for

AH/Qvar data.

Table 25. FIFO mode selection

TRIG_MODES

F_MODE[1:0]

Mode

Bypass

FIFO mode

Continuous (dynamic-stream)

Bypass-to-FIFO

Bypass-to-continuous (dynamic-stream)

Continuous (dynamic-stream)-to-FIFO

The STOP_ON_WTM bit enables the use of the FIFO watermark level: when the number of samples in FIFO is

equal to the watermark level (set using the WTM[6:0] bits in FIFO_WTM (15h)) then FIFO is full.

The TRIG_MODES bit enables the triggered FIFO modes.

The F_MODE[1:0] bits select one of the FIFO modes, as described in Table 25.

Output pressure data are read through FIFO_DATA_OUT_PRESS_XL (78h), FIFO_DATA_OUT_PRESS_L (79h),

and FIFO_DATA_OUT_PRESS_H (7Ah). Both single read and multiple read operations can be used.

ILPS22QS

FIFO_CTRL (14h)

DS13431 - Rev 3

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