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3.8.3
Low Pass Filter
n 0 + ( n 1 ? z – 1 ) + ( n 2 ? z – 2 ) + ( n 3 ? z – 3 ) + ( n 4 ? z – 4 )
Data from the Sinc filter is processed by an infinite impulse response (IIR) low pass filter.
H ( z ) = ---------------------------------------------------------------------------------------------------------------------------------
d 0 + ( d 1 ? z – 1 ) + ( d 2 ? z – 2 ) + ( d 3 ? z – 3 ) + ( d 4 ? z – 4 )
The device provides the option for one of twelve low-pass filters. The filter is selected with the LPF[3:0] bits in the AXISCFG
register. The filter selection options are listed in Section 3.1.7.3 , Table 11 . Response parameters for the low-pass filter are spec-
ified in Section 2.4 . Filter characteristics are illustrated in the figures on the following pages.
Table 24. Low Pass Filter Coefficients
Filter
Number
LPF
Value
(HEX)
Description
-3dB Frequency
(±5%)
Filter
Order
Sample
Time
( μ s ±5%)
Filter Coefficients
Group
Delay
Self Test
Step
Response
(ms)
n 0
2.08729034056887e-10
d 0
1
8
0x08
50 Hz LPF
4
16
n 1 8.349134489240434e-10 d 1
-3.976249694824219
14.00
n 2
1.25237777794924e-09
d 2
5.929003009577855
26816/f osc
0
0x00
100 Hz LPF
4
8
n 3 8.349103355433541e-10 d 3
-3.929255528257727
7.00
n 4 2.087307211059861e-10 d 4
n 0 1.639127731323242e-08 d 0
0.9765022168437554
1
9
0x09
150 Hz LPF
4
16
n 1 6.556510925292969e-08 d 1
-3.928921222686768
6.00
n 2 9.834768482194806e-08 d 2
5.789028996785419
9024/f osc
1
0x01
300 Hz LPF
4
8
n 3 6.556510372902331e-08 d 3
-3.791257019240902
3.00
n 4 1.639128257923422e-08 d 4
n 0 5.124509334564209e-08 d 0
0.9311495074496179
1
10
0x0A
200 Hz LPF
4
16
n 1 2.049803733825684e-07 d 1
-3.905343055725098
5.00
n 2 3.074705789151505e-07 d 2
5.72004239520561
6784/f osc
2
0x02
400 Hz LPF
4
8
n 3 2.049803958150164e-07 d 3
-3.723967810019985
2.50
n 4 5.124510693742625e-08 d 4
n 0 2.720393240451813e-06 d 0
0.9092692903507213
1
13
0x0D
200 Hz LPF
3
16
n 1 8.161179721355438e-06 d 1
-2.931681632995605
4.80
n 2 8.161180123840722e-06 d 2
2.865296718275204
5632/f osc
5
0x05
400 Hz LPF
3
8
n 3 2.720393634345496e-06 d 3 -0.9335933215174919
2.40
n 4
0
d 4
0
n 0 7.822513580322266e-07 d 0
1
11
0x0B
400 Hz LPF
4
16
n 1 3.129005432128906e-06 d 1
-3.811614513397217
2.50
n 2 4.693508163398543e-06 d 2
5.450666051045118
3392/f osc
3
0x03
800 Hz LPF
4
8
n 3 3.129005428784364e-06 d 3
-3.465805771100349
1.70
n 4 7.822513604678875e-07 d 4
n 0 1.865386962890625e-06 d 0
0.8267667478030489
1
12
0x0C
500 Hz LPF
4
16
n 1
7.4615478515625e-06
d 1
-3.765105724334717
3.20
n 2 1.119232176112846e-05 d 2
5.319861050818872
2688/f osc
4
0x04
1000 Hz LPF
4
8
n 3
7.4615478515625e-06
d 3
-3.34309015036024
1.60
n 4 1.865386966264658e-06 d 4
0.7883646729233078
Note: Low Pass Filter figures do not include g-cell frequency response.
MMA655x
Sensor
26
Freescale Semiconductor, Inc.
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