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MMA8652FC Datasheet(PDF) 56 Page - Freescale Semiconductor, Inc

Part # MMA8652FC
Description  Xtrinsic MMA8652FC 3-Axis, 12-bit Digital Accelerometer
PDF  77 Pages
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Manufacturer  FREESCALE [Freescale Semiconductor, Inc]
Direct Link  http://www.freescale.com
Logo FREESCALE - Freescale Semiconductor, Inc

MMA8652FC Datasheet(HTML) 56 Page - Freescale Semiconductor, Inc

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MMA8652FC
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Freescale Semiconductor, Inc.
6.11.4
0x26: PULSE_TMLT Pulse Time Window 1 register
Register quick jump table
Bits TMLT7 – TMLT0 define the maximum time interval that can elapse between the start of the acceleration on the selected axis
exceeding the specified threshold, and the end when the acceleration on the selected axis must go below the specified threshold
to be considered a valid pulse.
The minimum time step for the pulse time limit is defined in Table 51 and Table 52.
•
Maximum time for a given ODR and Oversampling mode is the time step pulse multiplied by 255.
•
The time steps available are dependent on the Oversampling mode and whether the pulse low-pass filter option is enabled
or not.
•
The pulse low-pass filter is set in Register 0x0F.
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
TMLT7
TMLT6
TMLT5
TMLT4
TMLT3
TMLT2
TMLT1
TMLT0
Figure 50. 0x26 PULSE_TMLT register (Read/Write)
Table 50. PULSE_TMLT register
Bit(s)
Field
Description
7–0
TMLT[7:0]
Pulse Time Limit
0000_0000 (default)
Table 51. Time Step for PULSE time limit (Reg 0x0F) Pulse_LPF_EN = 1
ODR (Hz)
Max Time Range (s)
Time Step (ms)
Normal
LPLN
HighRes
LP
Normal
LPLN
HighRes
LP
800
0.319
0.319
0.319
0.319
1.25
1.25
1.25
1.25
400
0.638
0.638
0.638
0.638
2.5
2.5
2.5
2.5
200
1.28
1.28
0.638
1.28
5
5
2.5
5
100
2.55
2.55
0.638
2.55
10
10
2.5
10
50
5.1
5.1
0.638
5.1
20
20
2.5
20
12.5
5.1
20.4
0.638
20.4
20
80
2.5
80
6.25
5.1
20.4
0.638
40.8
20
80
2.5
160
1.56
5.1
20.4
0.638
40.8
20
80
2.5
160
Table 52. Time Step for PULSE Time Limit (Reg 0x0F) Pulse_LPF_EN = 0
ODR (Hz)
Max Time Range (s)
Time Step (ms)
Normal
LPLN
HighRes
LP
Normal
LPLN
HighRes
LP
800
0.159
0.159
0.159
0.159
0.625
0.625
0.625
0.625
400
0.159
0.159
0.159
0.319
0.625
0.625
0.625
1.25
200
0.319
0.319
0.159
0.638
1.25
1.25
0.625
2.5
100
0.638
0.638
0.159
1.28
2.5
2.5
0.625
5
50
1.28
1.28
0.159
2.55
5
5
0.625
10
12.5
1.28
5.1
0.159
10.2
5
20
0.625
40
6.25
1.28
5.1
0.159
10.2
5
20
0.625
40
1.56
1.28
5.1
0.159
10.2
5
20
0.625
40



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