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ADIS16485 Datasheet(PDF) 24 Page - Analog Devices |
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ADIS16485 Datasheet(HTML) 24 Page - Analog Devices |
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24 / 32 page  ADIS16485 Data Sheet Linear Acceleration on Effect on Gyroscope Bias MEMS gyroscopes typically have a bias response to linear accel- eration that is normal to their axes of rotation. The ADIS16485 offers an optional compensation function for this effect; the factory default setting (0x00C0) for the CONFIG register enables this function. To turn it off, turn to Page 3 (DIN = 0x8003) and set CONFIG[7] = 0 (DIN = 0x8A20, DIN = 0x8B00). Note that this also keeps the point of percussion alignment function enabled. Table 67. CONFIG (Page 3, Base Address = 0x0A) Bits Description (Default = 0x00C0) [15:8] Not used 7 Linear-g compensation for gyroscopes (1 = enabled) 6 Point of percussion alignment (1 = enabled) [5:2] Not used 1 Real-time clock, daylight savings time (1: enabled, 0: disabled) 0 Real-time clock control (1: relative/elapsed timer mode, 0: calendar mode) ACCELEROMETERS The user calibration for the accelerometers includes registers for adjusting bias and sensitivity, as shown in Figure 23. X-AXIS ACCL FACTORY CALIBRATION AND FILTERING X_ACCL_OUT X_ACCL_LOW XA_BIAS_HIGH XA_BIAS_LOW 1 + X_ACCL_SCALE Figure 23. User Calibration Signal Path, Gyroscopes Manual Bias Correction The xA_BIAS_HIGH (see Table 68, Table 69, and Table 70) and xA_BIAS_LOW (see Table 71, Table 72, and Table 73) registers provide a bias adjustment function for the output of each accel- erometer sensor. The xA_BIAS_HIGH registers use the same format as x_ACCL_OUT registers. The xA_BIAS_LOW registers use the same format as x_ACCL_LOW registers. Table 68. XA_BIAS_HIGH (Page 2, Base Address = 0x1E) Bits Description (Default = 0x0000) [15:0] X-axis accelerometer offset correction, high word; twos complement, 0 g = 0x0000, 1 LSB = 0.25 mg Table 69. YA_BIAS_HIGH (Page 2, Base Address = 0x22) Bits Description (Default = 0x0000) [15:0] Y-axis accelerometer offset correction, high word; twos complement, 0 g = 0x0000, 1 LSB = 0.25 mg Table 70. ZA_BIAS_HIGH (Page 2, Base Address = 0x26) Bits Description (Default = 0x0000) [15:0] Z-axis accelerometer offset correction, high word; twos complement, 0 g = 0x0000, 1 LSB = 0.25 mg Table 71. XA_BIAS_LOW (Page 2, Base Address = 0x1C) Bits Description (Default = 0x0000) [15:0] X-axis accelerometer offset correction, low word; twos complement, 0 g = 0x0000, 1 LSB = 0.25 mg ÷ 216 = ~0.000003815 mg Table 72. YA_BIAS_LOW (Page 2, Base Address = 0x20) Bits Description (Default = 0x0000) [15:0] Y-axis accelerometer offset correction, low word; twos complement, 0 g = 0x0000, 1 LSB = 0.25 mg ÷ 216 = ~0.000003815 mg Table 73. ZA_BIAS_LOW (Page 2, Base Address = 0x24) Bits Description (Default = 0x0000) [15:0] Z-axis accelerometer offset correction, low word; twos complement, 0 g = 0x0000, 1 LSB = 0.25 mg ÷ 216 = ~0.000003815 mg Manual Sensitivity Correction The x_ACCL_SCALE registers enable sensitivity adjustment (see Table 74, Table 75, Table 76). Table 74. X_ACCL_SCALE (Page 2, Base Address = 0x0A) Bits Description (Default = 0x0000) [15:0] X-axis accelerometer scale correction; twos complement, 0x0000 = unity gain, 1 LSB = 1 ÷ 215 = ~0.003052% Table 75. Y_ACCL_SCALE (Page 2, Base Address = 0x0C) Bits Description (Default = 0x0000) [15:0] Y-axis accelerometer scale correction; twos complement, 0x0000 = unity gain, 1 LSB = 1 ÷ 215 = ~0.003052% Table 76. Z_ACCL_SCALE (Page 2, Base Address = 0x0E) Bits Description (Default = 0x0000) [15:0] Z-axis accelerometer scale correction; twos complement, 0x0000 = unity gain, 1 LSB = 1 ÷ 215 = ~0.003052% Rev. E | Page 24 of 32 |
Similar Part No. - ADIS16485_15 |
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Similar Description - ADIS16485_15 |
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