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ADIS16488A Datasheet(PDF) 17 Page - Analog Devices |
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ADIS16488A Datasheet(HTML) 17 Page - Analog Devices |
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17 / 35 page  Product Overview Online Documentation Design Resources Discussion Sample & Buy Data Sheet ADIS16488A Rev. C | Page 17 of 35 Table 30. Y_DELTANG_LOW(Page0, Base Address = 0x44) Bits Description [15:0] Y-axis delta angle data; additional resolution bits Table 31. Z_DELTANG_LOW (Page 0, Base Address = 0x48) Bits Description [15:0] Z-axis delta angle data; additional resolutionbits DELTA VELOCITY The registers that usethe x_DELTVEL_OUTformat arethe primary registers for the deltavelocity calculations. When processing data fromtheseregisters, use a 16-bit, twos complement data format (see Table 32, Table33, and Table 34). Table 35 provides x_DELTVEL_OUT digital coding examples. The delta velocity outputs representan integration of the accelerometer measurements and use thefollowing formula for all three axes (x-axis displayed): ( ) ∑ − = − + + + × = ∆ 1 0 1 , , , 2 1 D d d D n x d D n x S D n x a a f V where: D is the decimation rate = DEC_RATE+ 1. fS is the sample rate. d is the incremental variable in the summation formula. ax is the x-axis linear acceleration. n is the sample time, prior to the decimation filter. When using the internal sampleclock, fS is equal to 2460 SPS. When using theexternal clockoption, fS is equal to thefrequency of the external clock, which is limited to a minimum of 2 kHz, to prevent overflowin the x_DELTVEL_xxx registers at high rotation rates. See Table56 and Figure 20 for moreinformation on the DEC_RATEregister (decimation filter). Table 32. X_DELTVEL_OUT (Page 0, Base Address = 0x4E) Bits Description [15:0] X-axis delta velocitydata; twoscomplement, ±200 m/sec range, 0 m/sec = 0x0000 1 LSB = 200 m/sec ÷ 215 = ~6.104 mm/sec Table 33. Y_DELTVEL_OUT (Page 0, Base Address = 0x52) Bits Description [15:0] Y-axis deltavelocitydata; twoscomplement, ±200 m/sec range, 0 m/sec = 0x0000 1 LSB = 200 m/sec ÷ 215 = ~6.104 mm/sec Table 34. Z_DELTVEL_OUT (Page 0, Base Address = 0x56) Bits Description [15:0] Z-axisdelta velocity data; twos complement, ±200 m/sec range, 0 m/sec = 0x0000 1 LSB = 200 m/sec ÷ 215 = ~6.104 mm/sec Table 35. x_DELTVEL_OUT, Data FormatExamples Velocity (m/sec) Decimal Hex Binary +200 × (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 −200 −32,768 0x8000 1000 0000 0000 0000 The x_DELTVEL_LOWregisters(see Table36, Table 37, and Table 38)provideadditional resolutionbitsforthedelta velocityand combinewith thex_DELTVEL_OUT registerstoprovidea 32-bit, twos complement number. TheMSBin thex_DELTVEL_LOW registers haveaweightof~3.052 mm/sec(200 m/sec÷ 216), andeach subsequent bit carriesa weight of½ of thepreviousone. Table 36. X_DELTVEL_LOW(Page 0, Base Address = 0x4C) Bits Description [15:0] X-axis delta velocity data; additional resolution bits Table 37. Y_DELTVEL_LOW (Page 0, Base Address = 0x50) Bits Description [15:0] Y-axis delta velocity data; additional resolution bits Table 38. Z_DELTVEL_LOW(Page 0, Base Address = 0x54) Bits Description [15:0] Z-axis delta velocity data; additional resolutionbits MAGNETOMETERS The registers that usethe x_MAGN_OUT format aretheprimary registersforthemagnetometermeasurements. When processing data fromthese registers, usea 16-bit, twos complement data format. Table 39, Table 40, and Table 41 providethenumerical format for each register,and Table42 providesx_MAGN_OUT digital coding examples. Table 39. X_MAGN_OUT (Page 0, Base Address = 0x28) Bits Description [15:0] X-axis magnetometer data; twos complement, ±3.2767 gauss range, 0 gauss = 0x0000, 1 LSB = 0.1 mgauss Table 40. Y_MAGN_OUT (Page 0, Base Address = 0x2A) Bits Description [15:0] Y-axis magnetometer data; twos complement, ±3.2767 gauss range, 0 gauss = 0x0000, 1 LSB = 0.1 mgauss Table 41. Z_MAGN_OUT (Page 0, Base Address = 0x2C) Bits Description [15:0] Z-axis magnetometer data; twos complement, ±3.2767 gauss range, 0 gauss = 0x0000, 1 LSB = 0.1 mgauss |
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