FXLS8974CF datasheet(49/96 Pages) NXP

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NXP Semiconductors

FXLS8974CF

3-Axis Low-g Accelerometer

Field

Description

EXT_TRIG_M

External trigger function acquisition mode.

0 (default): Each positive going trigger edge causes a single ADC acquisition to be made. When

the number of acquisitions specified by the current operating mode decimation setting have been

triggered, the final decimated output is stored in the

OUT_X/Y/Z registers or the buffer depending on

the setting made in

BUF_CONFIG1[BUF_MODE[1:0]]. .

1: Each positive going trigger edge causes multiple ADC acquisitions. The number of acquisitions

are specified by the current operating mode decimation setting[1]. Once the specified number of

acquisitions have been made, the final decimated output is stored in the

OUT_X/Y/Z registers or the

buffer depending on the setting made in

BUF_CONFIG1[BUF_MODE[1:0]].

Notes:

• The EXT_TRIG_M setting only applies when INT2_FUNC = 1.

• The SRC_DRDY event flag is asserted after the specified number of measurements have

completed and the final decimated output result is available. Note that the SRC_DRDY flag is only

asserted when

BUF_CONFIG1[BUF_MODE[1:0]] = 00b

• In LPM, this bit has no effect as the decimation factor is fixed at 1.

WAKE_SDCD_WT

SDCD within thresholds event Auto-WAKE/SLEEP transition source enable

0 (default): SDCD within thresholds event is not used to prevent entry into/trigger an exit from SLEEP

mode.

1: SDCD within thresholds event is used to prevent entry into/trigger an exit from SLEEP mode.

WAKE_SDCD_OT

SDCD outside of thresholds event Auto-WAKE/SLEEP transition source enable

0 (default): SDCD outside of thresholds event is not used to prevent entry into/trigger an exit from

SLEEP mode.

1: SDCD outside of thresholds event is used to prevent entry into/trigger an exit from SLEEP mode.

WAKE_ORIENT

Orientation change event Auto-WAKE/SLEEP transition source enable

0 (default): Orientation change condition is not used as an event to prevent entry into /trigger an exit

from SLEEP mode.

1: Orientation change condition is used as an event to prevent entry into/trigger an exit from SLEEP

mode.

DRDY_PUL

Pulse generation option for DRDY event

0 (default): A SRC_DRDY event is output on the INTx pin as an active high or active low signal

depending on the polarity setting made in INT_POL. The INTx pin remains asserted until the host

reads any of the OUT_X/Y/Z registers.

1: A 32 μs (nominal) duration pulse is output on the configured INTx pin once per ODR cycle. The

output pulse is either positive or negative, depending on the INT_POL setting.

Notes:

• The pulsed output signal is OR'd with all of the other interrupt events assigned to the INTx pin.

• In Motion Detection mode (BT_MODE = VDD), the state of this bit is ignored and has no effect on

device operation.

Table 56. SENS_CONFIG4 register (address 18h) bit description

FXLS8974CF

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Objective data sheet

Rev. 1 — 27 April 2021

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