FXLS90130 datasheet(87/247 Pages) NXP

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NXP Semiconductors

FXLS9xxx0

Single channel inertial sensor

11.2.28.2 Arming pulse stretch (ARM_PS[1:0])

The ARM_PS[1:0] bits set the programmable pulse stretch time for the arming outputs.

See Section 11.9 for more details regarding the arming function. Pulse stretch times are

derived from the internal oscillator, so the tolerance on this oscillator applies.

ARM_PS[1]

ARM_PS[0]

Pulse stretch time (typical oscillator)

0 ms

128.000 ms - 130.048 ms

512.000 ms - 514.048 ms

2048.000 ms - 2050.048 ms

Table 156. Arming pulse stretch (ARM_PS[1:0])

11.2.28.3 Arming window size (ARM_WS_N[1:0], A_WS_P[1:0])

The ARM_WS_N[1:0] and ARM_WS_P[1:0] bits have a different function depending on

the state of the ARM_CFG bits in the CHx_CFG_U3 registers. See Section 11.9 for more

details regarding the arming function. If the arming function is set to moving average

mode, the ARM_WS bits set the number of sensor samples used for the arming function

moving aver-age. The number of samples is set independently for each polarity. If the

arming function is set to count mode, the ARM_WS bits set the sample count limit for the

arming function.

ARM_WS_P[1]

ARM_WS_P[0]

Positive window size

Table 157. Positive arming window size definitions (moving average mode)

ARM_WS_N[1]

ARM_WS_N[0]

Negative window size

Table 158. Negative arming window size definitions (moving average mode)

ARM_WS_N[1]

ARM_WS_N[0]

ARM_WS_P[1]

ARM_WS_P[0]

Sample count limit

Don't Care

Table 159. Arming count limit definitions (count mode)

FXLS9xxx0

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Product data sheet

Rev. 6 — 8 February 2021

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