mma1605nwr2 Freescale Semiconductor, Inc, mma1605nwr2 Datasheet - Page 22

• Manufacturer Part Number: mma1605nwr2
• Description: Dsi Inertial Sensor
• Manufacturer: Freescale Semiconductor, Inc

22
3.5.3.2
The filter selection options are listed in
tion
MMA16xxNW
Data from the Sinc filter is processed by an infinite impulse response (IIR) low pass filter.
The device provides the option for one of three low-pass filters. The filter is selected with the LPF[1:0] bits in the TYPE register.
Note: Low Pass Filter Figures do not include g-cell frequency response.
2.8. Filter characteristics are illustrated in the figures below.
Low Pass Filter
H z ( )
=
Table 8. Low Pass Filter Coefficients
Description
a 0
180 Hz LPF
400 Hz LPF
800 Hz LPF
⋅
(
--------------------------------------------------------------------------------------------
(
n 11 z 0
d 11 z 0
⋅
⋅
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
a
a
a
Section
11
12
13
21
22
23
11
12
13
21
22
23
11
12
13
21
22
23
0
0
0
)
)
+
+
(
(
0.000534069200512
0.499999985098839
0.003135988372378
0.000999420881271
0.001998946070671
0.000999405980110
0.250004753470421
0.499986037611961
0.250009194016457
0.011904109735042
0.003841564059258
0.007683292031288
0.003841534256935
0.250001862645149
0.499994158744812
0.250003993511200
n 12 z 1 –
d 12 z 1 –
3.1.2.1,
⋅
⋅
0.25
0.25
1
0
0
Filter Coefficients
)
)
Table
+
+
(
(
n 13 z 2 –
d 13 z 2 –
8. Response parameters for the low-pass filter are specified in
⋅
⋅
d
d
d
d
d
d
d
d
d
d
d
d
d
d
d
d
d
d
11
12
13
21
22
23
11
12
13
21
22
23
11
12
13
21
22
23
-1.959839582443237
-1.892452478408814
-1.919075012207031
-1.790004611015320
-1.836849451065064
0.960373640060425
0.923072755336761
0.801908731460571
0.852215826511383
0.89558845758438
)
)
⋅
(
--------------------------------------------------------------------------------------------
(
n 21 z 0
d 11 z 0
1.0
1.0
1.0
1.0
1
1
0
0
⋅
⋅
)
)
+
+
(
(
n 22 z 1 –
d 22 z 1 –
Group Delay
⋅
⋅
4608/f
3392/f
1728/f
)
)
osc
osc
osc
+
+
(
(
n 23 z 2 –
d 23 z 2 –
Freescale Semiconductor
⋅
⋅
)
)
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