FXLS8964AF datasheet(68/98 Pages) NXP

68 / 98 page

NXP Semiconductors

FXLS8964AF

3-Axis Low-g Accelerometer

FXLS8964AF

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Objective data sheet

Rev. 2 — 30 October 2020

68 / 98

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 will enter SLEEP mode if the host system does not clear any of these flags before

the auto-sleep timer expires (the period is set by the

ASLP_COUNT register). 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 is reset and FXLS8964AF will remain in the WAKE mode, regardless of the

setting made in

INT_EN[BUF_EN]. Note that the WAKE_SRC_BUF setting is only relevant when

BUF_CONFIG1[BUF_MODE] = 01b (Stream mode) or 10b (Stop mode).

5:0

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 will disable 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.

13.26 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, refer to Section 8.

Table 81. ORIENT_STATUS register (address 28h) bit allocation

Bit

Name

NEW_

ORIENT

—

LAPO[1:0]

BAFRO

Reset

Access

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

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

Note:

• 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.

Z-tilt angle lockout

0: Lockout condition has not been detected.

1: Z-tilt lockout trip angle has been exceeded. Lockout condition has been detected.

Note: The LO bit continues to update with orientation changes even after the NEW_ORIENT flag is

set.

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