FXLS8964AF datasheet(63/98 Pages) NXP

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NXP Semiconductors

FXLS8964AF

3-Axis Low-g Accelerometer

Field

Description

WAKE_SRC_BUF

Buffer WAKE-to-SLEEP transition source enable:

0: (BUF_WMRK | BUF_OVF) event flag condition is ignored by the auto-WAKE/SLEEP function

(default).

1: (BUF_WMRK | BUF_OVF) event flag condition is used by the auto-WAKE/SLEEP function.

FXLS8964AF enters SLEEP mode if the host system does not clear any of these flags before

the auto-sleep timer expires (the

ASLP_COUNT register sets the period). If the host clears the

BUF_WMRK and BUF_OVF flags by flushing or reading out the buffered data (one or more samples),

the auto-sleep timer resets and FXLS8964AF remains in the WAKE mode, regardless of the setting

made in

INT_EN[BUF_EN].

Note: The WAKE_SRC_BUF setting is only relevant when BUF_CONFIG1[BUF_MODE] = 01b

(Stream mode) or 10b (Stop mode).

5 to 0

BUF_WMRK[5:0]

Buffer sample count watermark:

This field sets the minimum number of buffer samples required to trigger a watermark interrupt.

A buffer watermark event flag

BUF_STATUS[BUF_WMRK] is raised whenever BUF_

STATUS[BUF_CNT] ≥ BUF_CONFIG2[BUF_WMRK[5:0]].

Setting BUF_WMRK = 0 disables the buffer watermark event flag generation.

This field is also used to set the maximum number of pre-trigger samples to collect in triggered

operating mode when

BUF_CONFIG1[BUF_MODE] = 11b.

Table 81. BUF_CONFIG2 register (address 27h) bit description...continued

15.26 ORIENT_STATUS register (address 28h)

The ORIENT_STATUS register is used to determine the status of an Orientation change

event, which is signaled when

INT_STATUS[SRC_ORIENT] = 1. For information on the

physical device orientations that correspond to the portrait up, portrait down, landscape

left, landscape right, back, and front orientation states, see Section 6.3.

Bit

Name

NEW_

ORIENT

—

LAPO[1:0]

BAFRO

Reset

Access

Table 82. ORIENT_STATUS register (address 28h) bit allocation

Field

Description

NEW_ORIENT

Orientation status change flag

0: No change in orientation detected

1: BAFRO and/or LAPO and/or Z-tilt lockout value has changed

Notes:

• The NEW_ORIENT bit is set to 1 after the first orientation detection after a Standby to Active

transition and whenever a change in LO, BAFRO, or LAPO status occurs. The NEW_ORIENT bit is

cleared anytime the ORIENT_STATUS register is read.

• The Auto-WAKE/SLEEP timer is reset (cleared) on the rising edge of this flag.

Table 83. ORIENT_STATUS register (address 28h) bit description

FXLS8964AF

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

Product data sheet

Rev. 3.4 — 7 December 2021

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