1 CMA3000-D0x Accelerometer
2 =========================
3
4 Supported chips:
5 * VTI CMA3000-D0x
6
7 Datasheet:
8 CMA3000-D0X Product Family Specification 828
9 <http://www.vti.fi/en/>
10
11 :Author: Hemanth V <hemanthv@ti.com>
12
13
14 Description
15 -----------
16
17 CMA3000 Tri-axis accelerometer supports Motion
18 Free fall modes.
19
20 Motion Detect Mode:
21 Its the low power mode where interrupts ar
22 when motion exceeds the defined thresholds
23
24 Measurement Mode:
25 This mode is used to read the acceleration
26 axis and supports 400, 100, 40 Hz sample f
27
28 Free fall Mode:
29 This mode is intended to save system resou
30
31 Threshold values:
32 Chip supports defining threshold values fo
33 which includes time and g value. Refer pro
34 more details.
35
36 CMA3000 chip supports mutually exclusive I2C a
37 communication, currently the driver supports I
38 Initial configuration for bus mode is set in n
39 be modified through bus interface command.
40
41 Driver reports acceleration data through input
42 event with value 1 when free fall is detected.
43
44 Platform data need to be configured for initia
45
46 Platform Data
47 -------------
48
49 fuzz_x:
50 Noise on X Axis
51
52 fuzz_y:
53 Noise on Y Axis
54
55 fuzz_z:
56 Noise on Z Axis
57
58 g_range:
59 G range in milli g i.e 2000 or 8000
60
61 mode:
62 Default Operating mode
63
64 mdthr:
65 Motion detect g range threshold value
66
67 mdfftmr:
68 Motion detect and free fall time threshold
69
70 ffthr:
71 Free fall g range threshold value
72
73 Input Interface
74 ---------------
75
76 Input driver version is 1.0.0
77 Input device ID: bus 0x18 vendor 0x0 product 0
78 Input device name: "cma3000-accelerometer"
79
80 Supported events::
81
82 Event type 0 (Sync)
83 Event type 3 (Absolute)
84 Event code 0 (X)
85 Value 47
86 Min -8000
87 Max 8000
88 Fuzz 200
89 Event code 1 (Y)
90 Value -28
91 Min -8000
92 Max 8000
93 Fuzz 200
94 Event code 2 (Z)
95 Value 905
96 Min -8000
97 Max 8000
98 Fuzz 200
99 Event code 40 (Misc)
100 Value 0
101 Min 0
102 Max 1
103 Event type 4 (Misc)
104
105
106 Register/Platform parameters Description
107 ----------------------------------------
108
109 mode::
110
111 0: power down mode
112 1: 100 Hz Measurement mode
113 2: 400 Hz Measurement mode
114 3: 40 Hz Measurement mode
115 4: Motion Detect mode (default)
116 5: 100 Hz Free fall mode
117 6: 40 Hz Free fall mode
118 7: Power off mode
119
120 grange::
121
122 2000: 2000 mg or 2G Range
123 8000: 8000 mg or 8G Range
124
125 mdthr::
126
127 X: X * 71mg (8G Range)
128 X: X * 18mg (2G Range)
129
130 mdfftmr::
131
132 X: (X & 0x70) * 100 ms (MDTMR)
133 (X & 0x0F) * 2.5 ms (FFTMR 400 Hz)
134 (X & 0x0F) * 10 ms (FFTMR 100 Hz)
135
136 ffthr::
137
138 X: (X >> 2) * 18mg (2G Range)
139 X: (X & 0x0F) * 71 mg (8G Range)
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