FXLS8471Q Datasheet, PDF (65/75 Pages) Freescale Semiconductor, Inc – Linear Accelerometer

Table 135. Time step for PULSE_LTCY with HP_FILTER_CUTOFF[pls_hpf_en] = 0
ODR (Hz)
800
400
200
100
50
12.5
6.25
1.56
Normal
0.318
0.318
0.638
1.276
2.56
2.56
2.56
2.56
Max time range (s)
LPLN
High
resolution
0.318
0.318
0.318
0.318
0.638
0.318
1.276
0.318
2.56
0.318
10.2
0.318
10.2
0.318
10.2
0.318
Low power
0.318
0.638
1.276
2.56
5.1
20.4
20.4
20.4
Normal
1.25
1.25
2.5
5
10
10
10
10
Time step (ms)
LPLN
High
resolution
1.25
1.25
1.25
1.25
2.5
1.25
5
1.25
10
1.25
40
1.25
40
1.25
40
1.25
Low power
1.25
2.5
5
10
20
80
80
80
10.11.8 PULSE_WIND (0x28) register
Table 136. PULSE_WIND register
pls_wind[7:0]
8’b00000000
Table 137. PULSE_WIND bit description
Field
pls_wind[7:0]
Description
pls_wind[7:0] defines the maximum interval of time that can elapse after the end of the latency interval in
which the start of the second pulse event must be detected provided the device has been configured for
double pulse detection. The detected second pulse width must be shorter than the time limit constraint
specified by the PULSE_TMLT register, but the end of the double pulse need not finish within the time
specified by the PULSE_WIND register.
The time step for the pulse-window counter varies with the selected ODR and power modes as defined in Tables 138 and 139.
The maximum time value is equal to (time step @ ODR and power mode) x 255.
Table 138. Time step for PULSE_WIND with HP_FILTER_CUTOFF[pls_hpf_en] = 1
ODR (Hz)
800
400
200
100
50
12.5
6.25
1.56
Normal
0.638
1.276
2.56
5.1
10.2
10.2
10.2
10.2
Max time range (s)
LPLN
High
resolution
0.638
0.638
1.276
1.276
2.56
1.276
5.1
1.276
10.2
1.276
40.8
1.276
40.8
1.276
40.8
1.276
Low power
0.638
1.276
2.56
5.1
10.2
40.8
81.6
81.6
Normal
2.5
5
10
20
40
40
40
40
Time step (ms)
LPLN
High
resolution
2.5
2.5
5
5
10
5
20
5
40
5
160
5
160
5
160
5
Low power
2.5
5
10
20
40
160
320
320
Sensors
Freescale Semiconductor, Inc.
FXLS8471Q
65