FXLS8964AF datasheet(59/98 Pages) NXP

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NXP Semiconductors

FXLS8964AF

3-Axis Low-g Accelerometer

FXLS8964AF

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Objective data sheet

Rev. 2 — 30 October 2020

59 / 98

13.18 SLEEP_IDLE_LSB register (address 1Ch)

Flexible Power Mode SLEEP idle time LSB. The contents of this register are only

meaningful when

SENS_CONFIG2[SLEEP_PM[1:0]] = 1xb. This register, along with

SLEEP_IDLE_MSB, sets the unsigned 12-bit SLEEP mode idle-time (off-time). The

counter time period is 312.5 µs/LSB, providing a range of 312.5 µs to 1.28 seconds. The

idle time + measurement time (set by the SLEEP mode decimation factor) forms the

measurement period (ODR–1).

Table 62. SLEEP_IDLE_LSB register (address 1Ch) bit allocation

Bit

Name

SLEEP_IDLE[7:0]

Reset

Access

R/W

13.19 SLEEP_IDLE_MSB register (address 1Dh)

Flexible Power Mode SLEEP idle time MSB (nibble). The contents of this register are

useful only when

SENS_CONFIG2[SLEEP_PM[1:0]] = 1xb.

Table 63. SLEEP_IDLE_MSB register (address 1Dh) bit allocation

Bit

Name

SLEEP_IDLE_TIME[11:8]

Reset

Access

R/W

13.20 ASLP_COUNT_LSB, ASLP_COUNT_MSB registers (addresses 1Eh to

1Fh)

The

ASLP_COUNT value sets the minimum number of ODR periods needed to transition

from WAKE to SLEEP mode when no event activity is detected. See Section 13.14 for

events that may be monitored for inactivity in order to trigger the transition to SLEEP

mode when the internal counter reaches the

ASLP_COUNT value.

The sleep counter period corresponds to the selected WAKE mode ODR period when

operating in LPM and HPM, and to the effective ODR set by the WAKE decimation

(measurement time) and WAKE idle time (off-time) settings when the device operates

in FPM. The auto-WAKE/SLEEP feature is only enabled when the value written to

ASLP_CNT is > 0.

The WAKE power mode is set by

SENS_CONFIG2[WAKE_PM]; the ODR is set by

SENS_CONFIG3[WAKE_ODR]. When operating in Flexible Performance Mode, the

effective ODR is set by the

SENS_CONFIG3[WAKE_DEC] and WAKE_IDLE[11:0]

values.

The SLEEP power mode is set by

SENS_CONFIG2[SLEEP_PM]; the ODR is set by

SENS_CONFIG3[SLEEP_ODR]. When operating in Flexible Performance Mode, the

effective ODR is set by the

SENS_CONFIG3[SLEEP_DEC] and SLEEP_IDLE[11:0]

values.

The functions used to detect inactivity and enter SLEEP mode upon expiry of the

ASLP_COUNT timer (refer to Table 68) are selected in SENS_CONFIG4 and

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