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PART NUMBER:
± 2g / 4g / 8g Tri-axis Digital
Accelerometer Specifications
KXTF9-4100
Rev. 6
Jun-2011
DATA_CTRL_REG
Read/write control register that configures the acceleration outputs. Note that to properly change the
value of this register, the PC1 bit in CTRL_REG1 must first be set to “0”.
R/W
0
Bit7
R/W
0
Bit6
R/W
HPFROA
Bit5
R/W
HPROB
Bit4
R/W
0
Bit3
R/W
OSAA
Bit2
R/W
OSAB
Bit1
R/W
OSAC
Bit0
Reset Value
00000010
I C Address: 0x21h
2
HPFROA, HPFROB sets the roll-off frequency for the first-order high-pass filter in conjunction
with the output data rate (OWUFA, OWUFB) that is chosen for the HPF acceleration outputs
that are used in the Motion Wake Up (WUF) application per Table 19. Note that this roll-off
frequency is also applied to the X, Y and Z high-pass filtered outputs.
High-Pass Filter Configuration
HPFROA HPFROB Beta
HPF Roll-Off (Hz)
0
0
1
1
0
1
0
1
7/8
15/16
31/32
63/64
ODR / 50
ODR / 100
ODR / 200
ODR / 400
Table 19. High-Pass Filter Roll-Off Frequency
OSAA, OSAB, OSAC sets the output data rate (ODR) for the low-pass filtered acceleration
outputs per Table 20.
OSAA
0
0
0
1
1
1
1
OSAB
0
1
1
0
0
1
1
OSAC
1
0
1
0
1
0
1
Output Data Rate
25Hz
50Hz
100Hz
200Hz
400Hz
800Hz
Does Not Exist
LPF Roll-Off
12.5Hz
25Hz
50Hz
100Hz
200Hz
400Hz
Does Not Exist
Table 20. LPF Acceleration Output Data Rate (ODR)
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