FXLS8971CF datasheet(63/100 Pages) NXP

63 / 100 page

NXP Semiconductors

FXLS8971CF

3-Axis Low-g Accelerometer

Field

Description

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

15.4 Orientation detection settings registers

15.4.1 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.

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.

2 to 1

LAPO[1:0]

Landscape/Portrait orientation

00: Portrait up: The device is oriented vertically in the upward direction.

01: Portrait down: The device is oriented vertically in the downward direction.

10: Landscape right: The device is oriented horizontally to the right.

11: Landscape left: The device is oriented horizontally to the left.

Note: The LAPO[1:0] field continues to update with orientation changes even after the NEW_

ORIENT flag is set.

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

FXLS8971CF

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

Product data sheet

Rev. 2.1 — 7 March 2024

63 / 100

FXLS8971CF 数据表(PDF) 63 Page - NXP Semiconductors

FXLS8971CF 数据表(HTML) 63 Page - NXP Semiconductors

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100

数据表下载