Datasheet
MMA8652FC
Sensors
32 Freescale Semiconductor, Inc.
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 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
00
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
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
3–2 0
1–0 SEL[1:0]
HPF cutoff frequency selection
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