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0x0D: WHO_AM_I Device ID Register
The device identification register identifies the part. The default value is 0x2A. This value is factory programmed. Consult the
factory for custom alternate values.
0x0D: WHO_AM_I Device ID Register (Read Only)
Bit 7
0
Bit 6
0
Bit 5
1
Bit 4
0
Bit 3
1
Bit 2
0
Bit 1
1
Bit 0
0
0x0E: XYZ_DATA_CFG Register
The XYZ_DATA_CFG register sets the dynamic range and sets the high-pass filter for the output data. When the HPF_OUT
bit is set. The data registers 0x01 - 0x06 will contain high-pass filtered data when this bit is set.
0x0E: XYZ_DATA_CFG (Read/Write)
Bit 7
0
Bit 6
0
Bit 5
0
Bit 4
HPF_OUT
Bit 3
0
Bit 2
0
Bit 1
FS1
Bit 0
FS0
Table 15. XYZ Data Configuration Descriptions
HPF_OUT
FS[1:0]
Enable High-Pass output data 1 = output data high-pass filtered. Default value: 0
Output buffer data format full scale. Default value: 00 (2g).
The default full scale value range is 2g and the high-pass filter is disabled.
Table 16. Full Scale Range
FS1
0
0
1
1
FS0
0
1
0
1
Full Scale Range
2
4
8
Reserved
0x0F: HP_FILTER_CUTOFF High-Pass Filter Register
This register sets the high-pass filter cutoff frequency for removal of the offset and slower changing acceleration data. The
output of this filter is indicated by 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 18 . For details of implementation on the high-pass filter, refer
to Freescale application note, AN4071.
0x0F: HP_FILTER_CUTOFF: High-Pass Filter Register (Read/Write)
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
0
0
Pulse_HPF_BYP Pulse_LPF_EN
0
0
SEL1
SEL0
Table 17. High-Pass Filter Cutoff Register Descriptions
Bypass High-Pass Filter for Pulse Processing Function.
Pulse_HPF_BYP
Pulse_LPF_EN
SEL[1:0]
0: HPF enabled for Pulse Processing, 1: HPF Bypassed for Pulse Processing
Default value: 0.
Enable Low-Pass Filter for Pulse Processing Function.
0: LPF disabled for Pulse Processing, 1: LPF Enabled for Pulse Processing
Default value: 0.
HPF Cutoff frequency selection.
Default value: 00 (see Table 18 ).
MMA8452Q
Sensors
22
Freescale Semiconductor, Inc.
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