FXLS93421 datasheet(113/254 Pages) NXP

113 / 254 page

NXP Semiconductors

FXLS9xxxx

Dual channel inertial sensor

1. The device counts the number of oscillator cycles in nI2C_PER_4ms_TYP periods

(nOSC_4ms).

2. nOSC_4ms is compared to nOSC_4ms_TYP. If the value is within the acceptable training

window (OscTrainWIN) specified in Section 10.20, an oscillator adjustment is made.

Otherwise, no adjustment is made.

a. If nOSC_4ms is greater than nOSC_4ms_TYP + OscTrainADJ, the oscillator frequency

target is decreased by OscTrainRES.

b. If nOSC_4ms is less than nOSC_4ms_TYP - OscTrainADJ, the oscillator frequency target

is increased by OscTrainRES.

c. The oscillator frequency target value is changed.

11.5.2 Oscillator training error handling

If oscillator training is enabled by the user, but the conditions are not correct to complete

oscillator training, the OSC-TRAIN_ERR bit is set in the DEVSTAT register. The following

conditions will result in the OSCTRAIN_ERR bit being set.

• The CLK_CAL_EN bit in the TIMING_CFG register is set and the measured period

(nOSC_4ms) for any mode is outside the Oscillator Training Window (OscTrainWIN).

• The result of the comparison is filtered with an up and down counter.

• If nOSC_4ms is outside the oscillator training window, the counter is incremented.

• If nOSC_4ms is inside the oscillator training window, the counter is decremented.

• If the counter reaches the OSCTRAIN_ERRCNT setting in the TIMING_CFG2 register,

the OSCTRAIN_ERR bit is set.

• The up and down counter has a maximum value of 127 and a minimum value of 0.

• The Command and Response Mode period established by the PDCM_PER and

CRM_PER settings does not fall within the 500 µs to 4 ms window.

• The Command and Response Mode period established by the PDCM_PER and

CRM_PER settings is not a whole number divisor of 4 ms.

11.6 Inertial sensor signal path

11.6.1 Inertial sensor transducer

The device transducer is an overdamped mass-spring-damper system defined by the

following transfer function:

(2)

Where:

Damping Ratio

ωn

Natural Frequency =

2∗Π∗fn

See Section 10.19 for transducer parameters.

FXLS9xxxx

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

Product data sheet

Rev. 6 — 8 February 2021

113 / 254

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