FXLS8471Q Datasheet, PDF (63/75 Pages) Freescale Semiconductor, Inc – Linear Accelerometer

10.11.4 PULSE_THSY (0x24) register
Table 124. PULSE_THSY register
—
0
pls_thsy[6:0]
7’b0000000
Table 125. PULSE_THSY bit description
Field
pls_thsy[6:0]
Pulse threshold for Y-axis.
10.11.5 PULSE_THSZ (0x25) register
Description
Table 126. PULSE_THSZ register
—
0
pls_thsz[6:0]
7’b0000000
Table 127. PULSE_THSZ bit description
Field
pls_thsz[6:0]
Pulse threshold for Z-axis.
10.11.6 PULSE_TMLT (0x26) register
Description
Table 128. PULSE_TMLT register
pls_tmlt[7:0]
8’b00000000
Table 129. PULSE_TMLT bit description
Field
pls_tmlt[7:0]
Description
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.
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 130. Time step for PULSE_TMLT with HP_FILTER_CUTOFF[pls_hpf_en] = 1
ODR (Hz)
800
400
200
100
50
12.5
6.25
1.56
Normal
0.319
0.638
1.28
2.55
5.1
5.1
5.1
5.1
Max time range (s)
LPLN
High
resolution
0.319
0.319
0.638
0.638
1.28
0.638
2.55
0.638
5.1
0.638
20.4
0.638
20.4
0.638
20.4
0.638
Low power
0.319
0.638
1.28
2.55
5.1
20.4
40.8
40.8
Normal
1.25
2.5
5
10
20
20
20
20
Time step (ms)
LPLN
High
resolution
1.25
1.25
2.5
2.5
5
2.5
10
2.5
20
2.5
80
2.5
80
2.5
80
2.5
Low power
1.25
2.5
5
10
20
80
160
160
Sensors
Freescale Semiconductor, Inc.
FXLS8471Q
63