1 CMA3000-D0x Accelerometer 2 ========================= 3 4 Supported chips: 5 * VTI CMA3000-D0x 6 7 Datasheet: 8 CMA3000-D0X Product Family Specification 8281000A.02.pdf 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 detect, Measurement and 18 Free fall modes. 19 20 Motion Detect Mode: 21 Its the low power mode where interrupts are generated only 22 when motion exceeds the defined thresholds. 23 24 Measurement Mode: 25 This mode is used to read the acceleration data on X,Y,Z 26 axis and supports 400, 100, 40 Hz sample frequency. 27 28 Free fall Mode: 29 This mode is intended to save system resources. 30 31 Threshold values: 32 Chip supports defining threshold values for above modes 33 which includes time and g value. Refer product specifications for 34 more details. 35 36 CMA3000 chip supports mutually exclusive I2C and SPI interfaces for 37 communication, currently the driver supports I2C based communication only. 38 Initial configuration for bus mode is set in non volatile memory and can later 39 be modified through bus interface command. 40 41 Driver reports acceleration data through input subsystem. It generates ABS_MISC 42 event with value 1 when free fall is detected. 43 44 Platform data need to be configured for initial default values. 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 value 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 0x0 version 0x0 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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