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ADIS16488 Datasheet(PDF) 16 Page - Analog Devices |
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ADIS16488 Datasheet(HTML) 16 Page - Analog Devices |
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16 / 36 page  ADIS16488 Data Sheet Rev. B | Page 16 of 36 The registers that use the x_DELTANG_LOW format provide additional resolution for the gyroscope measurements (see Table 28, Table 29, and Table 30). The MSB has a weight of ~0.011° (720°/216), and each subsequent bit carries a weight of ½ of the previous one. Table 28. X_DELTANG_LOW (Page 0, Base Address = 0x40) Bits Description [15:0] X-axis delta angle data; additional resolution bits Table 29. Y_DELTANG_LOW (Page 0, Base Address = 0x44) Bits Description [15:0] Y-axis delta angle data; additional resolution bits Table 30. Z_DELTANG_LOW (Page 0, Base Address = 0x48) Bits Description [15:0] Z-axis delta angle data; additional resolution bits DELTA VELOCITY The delta velocity outputs represent an integration of the accelerometer measurements and use the following formula for all three axes (x-axis displayed): ( ) S S n x n x S x f RATE DEC Δt a a t 1 _ ; 2 , 1 , + = + × ∆ = ∆ + θ where: ax is the accelerometer, x-axis. ΔtS is the time between samples. When using the internal sample clock, fS is equal to 2.46 kHz. When using the external clock option, the time between samples is the time between active edges on the input clock signal, as measured by the internal clock (252 MHz). See Table 55 for more information on the DEC_RATE register. The registers that use the x_DELTVEL_OUT format are the primary registers for the delta velocity calculations. When processing data from these registers, use a 16-bit, twos complement data format (see Table 31, Table 32, and Table 33). Table 34 provides x_DELTVEL_OUT digital coding examples. Table 31. X_DELTVEL_OUT (Page 0, Base Address = 0x4E) Bits Description [15:0] X-axis delta velocity data; twos complement, ±200 m/sec range, 0 m/sec = 0x0000 1 LSB = 200 m/sec ÷ (215 – 1) = ~6.104 mm/sec Table 32. Y_DELTVEL_OUT (Page 0, Base Address = 0x52) Bits Description [15:0] Y-axis delta velocity data; twos complement, ±200 m/sec range, 0 m/sec = 0x0000 1 LSB = 200 m/sec ÷ (215 − 1) = ~6.104 mm/sec Table 33. Z_DELTVEL_OUT (Page 0, Base Address = 0x56) Bits Description [15:0] Z-axis delta velocity data; twos complement, ±200 m/sec range, 0 m/sec = 0x0000 1 LSB = 200 m/sec ÷ (215 − 1) = ~6.104 mm/sec Table 34. x_DELTVEL_OUT, Data Format Examples Velocity (m/sec) Decimal Hex Binary +160 × (215 − 1)/215 +32,767 0x7FFF 0111 1111 1111 1111 +400/215 +2 0x0002 0000 0000 0000 0010 +200/215 +1 0x0001 0000 0000 0000 0001 0 0 0x0000 0000 0000 0000 0000 −200/215 −1 0xFFFF 1111 1111 1111 1111 −400/215 −2 0xFFFE 1111 1111 1111 1110 −160 −32,768 0x8000 1000 0000 0000 0000 The registers that use the x_DELTVEL_LOW naming format provide additional resolution for the gyroscope measurements (see Table 35, Table 36, and Table 37). The MSB has a weight of ~3.052 mm/sec (200 m/sec ÷ 216), and each subsequent bit carries a weight of ½ of the previous one. Table 35. X_DELTVEL_LOW (Page 0, Base Address = 0x4C) Bits Description [15:0] X-axis delta velocity data; additional resolution bits Table 36. Y_DELTVEL_LOW (Page 0, Base Address = 0x50) Bits Description [15:0] Y-axis delta velocity data; additional resolution bits Table 37. Z_DELTVEL_LOW (Page 0, Base Address = 0x54) Bits Description [15:0] Z-axis delta velocity data; additional resolution bits |
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