FXLS8971CF datasheet(69/100 Pages) NXP

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NXP Semiconductors

FXLS8971CF

3-Axis Low-g Accelerometer

Field

Description

OT_EA

SDCD outside-of-thresholds event active flag

0 (default): Event flag has not been asserted; the data for all enabled axes is within the window

defined by

SDCD_UTHS and SDCD_LTHS registers.

1: One or more of the enabled axes sensor data (absolute mode) or deltas (relative mode) sits on or

outside of (for example, (data or delta) ≤

SDCD_LTHS or (data or delta) ≥ SDCD_UTHS) the upper

or lower thresholds specified in the

SDCD_UTHS and SDCD_LTHS registers. The OT_EA flag is

set whenever (X_OT_EF | Y_OT_EF | Z_OT_EF

) evaluates to true for a number of ODR periods ≥

SDCD_OT_DBCNT.

Notes:

• The axes selected for participation in the over thresholds condition evaluation are enabled via the

X/Y/Z_OT_EN bits in the

SDCD_CONFIG1 register. If none of the X/Y/Z_OT_EN bits are set, then

the SDCD_OT function is effectively disabled.

• When SENS_CONFIG4[WAKE_SDCD_OT] = 1, the Auto-WAKE/SLEEP timer is reset on every

ODR cycle when the OT_EA flag is asserted (set), which prevents the device from transitioning

into SLEEP mode. This flag must be de-asserted (cleared) in order for FXLS8971CF to transition to

SLEEP mode.

X_OT_EF

X-axis data or delta-outside-of-upper-and-lower-thresholds event flag; enabled if X_OT_EN = 1

0: X-axis data or delta is <

SDCD_UTHS value and > SDCD_LTHS value.

1: X-axis data or delta is either ≥

SDCD_UTHS value or ≤ SDCD_LTHS value; the X_OT_POL flag

may be used to determine which threshold has been met or crossed.

X_OT_POL[1][2]

X-axis outside-of-thresholds polarity flag

0: X-axis data or delta was ≤ lower threshold value

1: X-axis data or delta was ≥ upper threshold value

Y_OT_EF

Y-axis data or delta-outside-of-upper-and-lower-thresholds event flag; enabled if Y_OT_EN = 1

0: Y-axis data or delta is <

SDCD_UTHS value and > SDCD_LTHS value.

1: Y-axis data or delta is either ≥

SDCD_UTHS value or ≤ SDCD_LTHS value; the Y_OT_POL flag

may be used to determine which threshold has been met or crossed.

Y_OT_POL[1][2]

Y-axis outside-of-thresholds polarity flag

0: Y-axis data or delta was equal to or below lower threshold value

1: Y-axis data or delta was equal to or above upper threshold value

Z_OT_EF[1][2]

Z-axis data or delta-outside-of-upper-and-lower-thresholds event flag; enabled if Z_OT_EN = 1

0: Z-axis data or delta is <

SDCD_UTHS value and > SDCD_LTHS value

1: Z-axis data or delta is either ≥

SDCD_UTHS value or ≤ SDCD_LTHS value; the Z_OT_POL flag

may be used to determine which threshold has been met or crossed

Z_OT_POL

Z-axis outside-of-thresholds polarity flag

0: Z-axis data or delta was equal to or below lower threshold value

1: Z-axis data or delta was equal to or above upper threshold value

Table 97. SDCD_INT_SRC1 register (address 2Dh) bit description

[1]

This flag is only meaningful if X/Y/Z_OT_EF = 1; their individual states are latched when the X/Y/Z_OT_EF flags are set, regardless of the state of SDCD_

CONFIG1[OT_ELE].

[2]

When SDCD_CONFIG1[OT_ELE] = 0, these flags are updated when X/Y/Z_OT_EF = 1 and the SDCD_OT_DBCNT value is reached.

15.5.2 SDCD_INT_SRC2 register (address 2Eh)

This register contains the SDCD within-thresholds event status flags. The WT_EA flag may be used to signal

interrupts to a host processor are mapped to one of the INT1 or INT2 pins.

FXLS8971CF

All information provided in this document is subject to legal disclaimers.

Product data sheet

Rev. 2.1 — 7 March 2024

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