FXLS8471Q datasheet(63/75 Pages) FREESCALE

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FXLS8471Q

Sensors

Freescale Semiconductor, Inc.

10.11.4

PULSE_THSY (0x24) register

10.11.5

PULSE_THSZ (0x25) register

10.11.6

PULSE_TMLT (0x26) register

Minimum time step for the pulse-time limit is defined in Tables 130 and 131. Maximum time for a given ODR is “Minimum time

step x 255”.

Table 124. PULSE_THSY register

—

pls_thsy[6:0]

7’b0000000

Table 125. PULSE_THSY bit description

Field

Description

pls_thsy[6:0]

Pulse threshold for Y-axis.

Table 126. PULSE_THSZ register

—

pls_thsz[6:0]

7’b0000000

Table 127. PULSE_THSZ bit description

Field

Description

pls_thsz[6:0]

Pulse threshold for Z-axis.

Table 128. PULSE_TMLT register

pls_tmlt[7:0]

8’b00000000

Table 129. PULSE_TMLT bit description

Field

Description

pls_tmlt[7:0]

pls_tmlt[7:0] defines the maximum time interval that can elapse between the start of the acceleration on the selected

channel exceeding the specified threshold and the end when the channel acceleration goes back below the specified

threshold.

Table 130. Time step for PULSE_TMLT with HP_FILTER_CUTOFF[pls_hpf_en] = 1

ODR (Hz)

Max time range (s)

Time step (ms)

Normal

LPLN

High

resolution

Low power

Normal

LPLN

High

resolution

Low power

800

0.319

1.25

400

0.638

2.5

200

1.28

0.638

1.28

2.5

100

2.55

0.638

2.55

2.5

5.1

0.638

5.1

2.5

12.5

5.1

20.4

0.638

20.4

2.5

6.25

5.1

20.4

0.638

40.8

2.5

160

1.56

5.1

20.4

0.638

40.8

2.5

160

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