MMA16XXKW FREESCALE [Freescale Semiconductor, Inc], MMA16XXKW Datasheet - Page 22

• Manufacturer Part Number: MMA16XXKW
• Description: DSI Inertial Sensor
• Manufacturer: FREESCALE [Freescale Semiconductor, Inc]

22
3.5.3.2
The filter selection options are listed in
Section
MMA16xxKW
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
11
12
13
21
22
23
11
12
13
21
22
23
11
12
13
21
22
23
Section
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
+
+
Freescale Semiconductor, Inc.
n 23 z 2 –
d 23 z 2 –
Sensors