Freescale Semiconductor FRDM-FXS-MULTI-B 数据表
MMA8652FC
Sensors
Freescale Semiconductor, Inc.
Freescale Semiconductor, Inc.
31
6.6.2
0x0F: HP_FILTER_CUTOFF High-Pass Filter register
The High-Pass Filter register sets the high-pass filter cutoff frequency for removal of the offset and slower changing acceleration
data. The output of this filter is logged in the data registers (0x01–0x06) when bit 4 (HPF_OUT) of Register 0x0E is set. The filter
cutoff options change based on the data rate selected, as shown in
data. The output of this filter is logged in the data registers (0x01–0x06) when bit 4 (HPF_OUT) of Register 0x0E is set. The filter
cutoff options change based on the data rate selected, as shown in
Table 33
. For more information about the high-pass filter, see
application note AN4083, Data Manipulation and Basic Settings for Xtrinsic MMA865xFC Accelerometers.
Table 31. 0x0F HP_FILTER_CUTOFF: High-Pass Filter register (Read/Write)
Back to Register Address Map
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
0
0
Pulse_HPF_BY
Pulse_LPF_EN
0
0
SEL1
SEL0
Table 32. High-Pass filter cutoff register
Bit(s)
Field
Description
7–6
0
5
Pulse_HPF_BYP
Bypass High-Pass Filter (HPF) for pulse processing function
0 HPF is enabled for pulse processing (default)
1 HPF is bypassed for pulse processing
0 HPF is enabled for pulse processing (default)
1 HPF is bypassed for pulse processing
4
Pulse_LPF_EN
Enable Low-Pass Filter (LPF) for pulse processing function
0 LPF is disabled for pulse processing (default)
1 LPF is enabled for pulse processing
0 LPF is disabled for pulse processing (default)
1 LPF is enabled for pulse processing
3–2
0
1–0
SEL[1:0]
HPF cutoff frequency selection
00 Default value, see
00 Default value, see
Table 33
Table 33. High-Pass filter cutoff options
SEL1
SEL0
800 Hz
400 Hz
200 Hz
100 Hz
50 Hz
12.5 Hz
6.25 Hz
1.56 Hz
Oversampling Mode = Normal
0
0
16 Hz
16 Hz
8 Hz
4 Hz
2 Hz
2 Hz
2 Hz
2 Hz
0
1
8 Hz
8 Hz
4 Hz
2 Hz
1 Hz
1 Hz
1 Hz
1 Hz
1
0
4 Hz
4 Hz
2 Hz
1 Hz
0.5 Hz
0.5 Hz
0.5 Hz
0.5 Hz
1
1
2 Hz
2 Hz
1 Hz
0.5 Hz
0.25 Hz
0.25 Hz
0.25 Hz
0.25 Hz
Oversampling Mode = Low Noise Low Power
0
0
16 Hz
16 Hz
8 Hz
4 Hz
2 Hz
0.5 Hz
0.5 Hz
0.5 Hz
0
1
8 Hz
8 Hz
4 Hz
2 Hz
1 Hz
0.25 Hz
0.25 Hz
0.25 Hz
1
0
4 Hz
4 Hz
2 Hz
1 Hz
0.5 Hz
0.125 Hz
0.125 Hz
0.125 Hz
1
1
2 Hz
2 Hz
1 Hz
0.5 Hz
0.25 Hz
0.063 Hz
0.063 Hz
0.063 Hz
Oversampling Mode = High Resolution
0
0
16 Hz
16 Hz
16 Hz
16 Hz
16 Hz
16 Hz
16 Hz
16 Hz
0
1
8 Hz
8 Hz
8 Hz
8 Hz
8 Hz
8 Hz
8 Hz
8 Hz
1
0
4 Hz
4 Hz
4 Hz
4 Hz
4 Hz
4 Hz
4 Hz
4 Hz
1
1
2 Hz
2 Hz
2 Hz
2 Hz
2 Hz
2 Hz
2 Hz
2 Hz
Oversampling Mode = Low Power
0
0
16 Hz
8 Hz
4 Hz
2 Hz
1 Hz
0.25 Hz
0.25 Hz
0.25 Hz
0
1
8 Hz
4 Hz
2 Hz
1 Hz
0.5 Hz
0.125 Hz
0.125 Hz
0.125 Hz
1
0
4 Hz
2 Hz
1 Hz
0.5 Hz
0.25 Hz
0.063 Hz
0.063 Hz
0.063 Hz
1
1
2 Hz
1 Hz
0.5 Hz
0.25 Hz
0.125 Hz
0.031 Hz
0.031 Hz
0.031 Hz