FXLS8971CF datasheet(71/100 Pages) NXP

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NXP Semiconductors

FXLS8971CF

3-Axis Low-g Accelerometer

Field

Description

Z_WT_EF

Z-axis data or delta inside of upper and lower thresholds event flag; This flag is only valid if Z_WT_EN

= 1:

0: Z-axis data or delta is ≥

SDCD_UTHS value or ≤ SDCD_LTHS value.

1: Z-axis data or delta is <

SDCD_UTHS and > SDCD_LTHS value.

Notes:

• The SDCD_CONFIG1[WT_ELE] bit determines the behavior of this bit. If WT_ELE = 1, the flag

is latched when WT_EA goes high, and remains set until it is cleared by reading the

SDCD_

INT_SRC2 register. If the host wishes to know the state of this event flag, it must be read prior to

reading the

SDCD_INT_SRC2 register.

• If WT_ELE = 0, the X/Y/Z_WT_EF flags are updated if WT_EA = 1 and the SDCD_WT_DBCNT

value is reached. If WT_ELE = 0, the X/Y/Z_WT_EF flags are updated even if WT_EA = 0 when the

SDCD_WT_DBCNT value is set to 0.

Table 99. SDCD_INT_SRC2 register (address 2Eh) bit description...continued

15.5.3 SDCD_CONFIG1 register (address 2Fh)

Bit

Name

OT_ELE WT_ELE X_OT_EN Y_OT_EN Z_OT_EN X_WT_EN Y_WT_EN Z_WT_EN

Reset (BT_MODE = GND)

Reset (BT_MODE = VDD)

Access

R/W

Table 100. SDCD_CONFIG1 register (address 2Fh) bit allocation

Field

Description

OT_ELE

SDCD outside-of-thresholds event latch

0 (default): Outside of thresholds event flag latching is disabled.

1: Outside of thresholds event flag latching is enabled.

With outside-of-thresholds event latching enabled, the X/Y/Z_OT_EF flags can only be cleared

by reading the

SDCD_INT_SRC1 register. When OT_ELE is set, the outside-of-thresholds event

condition (OT_EA) flag is only asserted when the event condition transitions from False to True. For

example, once the OT_EA flag is set, the event condition must become False before a subsequent

True event is recognized. With outside-of-thresholds event latching disabled, the X/Y/Z_OT_EF flags

are updated in real time and may be cleared by the function prior to the host system reading

SDCD_

INT_SRC1 if the event condition becomes false before the read occurs.

WT_ELE

SDCD within-thresholds event latch

0 (default): Within thresholds event flag latching is disabled.

1: Within thresholds event flag latching is enabled.

With within-thresholds event latching enabled, the X/Y/Z_WT_EF flags can only be cleared by reading

the

SDCD_INT_SRC2 register. When within-thresholds event latching is disabled, the X/Y/Z_WT_

EF flags are updated in real time and may be cleared by the function prior to the host system reading

the

SDCD_INT_SRC2 register, if the event condition becomes false before the read occurs. When

WT_ELE is set, the within-thresholds event condition (WT_EA) flag is only asserted when the event

condition transitions from False to True. For example, once the WT_EA flag is set, the event condition

must become False before a subsequent True event will be recognized

X_OT_EN

SDCD function X-axis outside-of-thresholds condition

0: X-axis data or delta is not used in the outside of thresholds condition evaluation.

1: X-axis data or delta is used in the outside of thresholds condition evaluation.

Table 101. SDCD_CONFIG1 register (address 2Fh) bit description

FXLS8971CF

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Product data sheet

Rev. 2.1 — 7 March 2024

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