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MMA8451Q Datasheet(PDF) 39 Page - Freescale Semiconductor, Inc

Part # MMA8451Q
Description  3-Axis, 14-bit 8-bit Digital Accelerometer
PDF  52 Pages
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Manufacturer  FREESCALE [Freescale Semiconductor, Inc]
Direct Link  http://www.freescale.com
Logo FREESCALE - Freescale Semiconductor, Inc

MMA8451Q Datasheet(HTML) 39 Page - Freescale Semiconductor, Inc

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MMA8451Q
Sensors
Freescale Semiconductor, Inc.
39
0x27: PULSE_LTCY Pulse Latency Timer Register
The bits LTCY7 through LTCY0 define the time interval that starts after the first pulse detection. During this time interval, all
pulses are ignored. Note: This timer must be set for single pulse and for double pulse.
The minimum time step for the pulse latency is defined in Table 53 and Table 54. The maximum time is the time step at the ODR
and Oversampling mode multiplied by 255. The timing also changes when the Pulse LPF is enabled or disabled.
Table 51. 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
0x27: PULSE_LTCY Register (Read/Write)
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
LTCY7
LTCY6
LTCY5
LTCY4
LTCY3
LTCY2
LTCY1
LTCY0
Table 52. PULSE_LTCY Description
LTCY[7:0]
Latency Time Limit. Default value: 0000_0000
Table 53. Time Step for PULSE Latency @ ODR and Power Mode (Reg 0x0F) Pulse_LPF_EN = 1
ODR (Hz)
Max Time Range (s)
Time Step (ms)
Normal
LPLN
HighRes
LP
Normal
LPLN
HighRes
LP
800
0.638
0.638
0.638
0.638
2.5
2.5
2.5
2.5
400
1.276
1.276
1.276
1.276
5555
200
2.56
2.56
1.276
2.56
10
10
5
10
100
5.1
5.1
1.276
5.1
20
20
5
20
50
10.2
10.2
1.276
10.2
40
40
5
40
12.5
10.2
40.8
1.276
40.8
40
160
5
160
6.25
10.2
40.8
1.276
81.6
40
160
5
320
1.56
10.2
40.8
1.276
81.6
40
160
5
320
Table 54. Time Step for PULSE Latency @ ODR and Power Mode (Reg 0x0F) Pulse_LPF_EN = 0
ODR (Hz)
Max Time Range (s)
Time Step (ms)
Normal
LPLN
HighRes
LP
Normal
LPLN
HighRes
LP
800
0.318
0.318
0.318
0.318
1.25
1.25
1.25
1.25
400
0.318
0.318
0.318
0.638
1.25
1.25
1.25
2.5
200
0.638
0.638
0.318
1.276
2.5
2.5
1.25
5
100
1.276
1.276
0.318
2.56
5
5
1.25
10
50
2.56
2.56
0.318
5.1
10
10
1.25
20
12.5
2.56
10.2
0.318
20.4
10
40
1.25
80
6.25
2.56
10.2
0.318
20.4
10
40
1.25
80
1.56
2.56
10.2
0.318
20.4
10
40
1.25
80



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