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ADIS16489 Datasheet(PDF) 21 Page - Analog Devices |
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ADIS16489 Datasheet(HTML) 21 Page - Analog Devices |
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21 / 40 page  Data Sheet ADIS16489 Rev. B | Page 21 of 40 Y-Axis Delta Angle (Y_DELTANG_LOW, Y_DELTANG_OUT) Table 62. Y_DELTANG_LOW Register Definitions Page Addresses Default Access Flash Backup 0x00 0x44, 0x45 Not applicable R No Table 63. Y_DELTANG_LOW Bit Definitions Bits Description [15:0] Y-axis delta angle data; low word Table 64. Y_DELTANG_OUT Register Definitions Page Addresses Default Access Flash Backup 0x00 0x46, 0x47 Not applicable R No Table 65. Y_DELTANG_OUT Bit Definitions Bits Description [15:0] Y-axis delta angle data; twos complement, ±720° range, 0° = 0x0000, 1 LSB = 720°/215 = ~0.022° The Y_DELTANG_LOW (see Table 62 and Table 63) and Y_DELTANG_OUT (see Table 64 and Table 65) registers contain the delta angle data for the y-axis. Z-Axis Delta Angle (Z_DELTANG_LOW, Z_DELTANG_OUT) Table 66. Z_DELTANG_LOW Register Definitions Page Addresses Default Access Flash Backup 0x00 0x48, 0x49 Not applicable R No Table 67. Z_DELTANG_LOW Bit Definitions Bits Description [15:0] Z-axis delta angle data; low word Table 68. Z_DELTANG_OUT Register Definitions Page Addresses Default Access Flash Backup 0x00 0x4A, 0x4B Not applicable R No Table 69. Z_DELTANG_OUT Bit Definitions Bits Description [15:0] Z-axis delta angle data; twos complement, ±720° range, 0° = 0x0000, 1 LSB = 720°/215 = ~0.022° The Z_DELTANG_LOW (see Table 66 and Table 67) and Z_DELTANG_OUT (see Table 68 and Table 69) registers contain the delta angle data for the z-axis. Delta Angle Resolution Table 70 and Table 71 offers various numerical examples that demonstrate the format of the delta-angle data in 16-bit and 32-bit formats. Table 70. 16-Bit Delta Angle Data Format Examples Delta Angle (°) Decimal Hex Binary +720 × (215 − 1)/215 +32,767 0x7FFF 0111 1111 1110 1111 +720/214 +2 0x0002 0000 0000 0000 0010 +720/215 +1 0x0001 0000 0000 0000 0001 0 0 0x0000 0000 0000 0000 0000 −720/215 −1 0xFFFF 1111 1111 1111 1111 −720/214 −2 0xFFFE 1111 1111 1111 1110 −720 −32,768 0x8000 1000 0000 0000 0000 Table 71. 32-Bit Delta Angle Data Format Examples Delta Angle (°) Decimal Hex +720 × (231 − 1)/231 +2,147,483,647 0x7FFFFFFF +720/230 +2 0x00000002 +720/231 +1 0x00000001 0 0 0x00000000 −720/231 −1 0xFFFFFFFF −720/230 −2 0xFFFFFFFE −720 −2,147,483,648 0x80000000 DELTA VELOCITY In addition to the linear acceleration measurements along each axis (x, y, and z), the ADIS16489 also provides delta velocity measurements that represent a computation of linear velocity change between each sample update. PIN 1 PIN 23 ΔVY Y-AXIS X-AXIS ΔVX Z-AXIS ΔVZ Figure 25. Delta Velocity Axis and Polarity Assignments The delta velocity outputs represent an integration of the acceleration measurements and use the following formula for all three axes (x-axis displayed): ( ) , ,, D x nD x nD d x nD d d S V aa f − + + − = ∆ = × + ∑ 1 1 0 1 2 where: D is the decimation rate = DEC_RATE + 1 (see Table 159). fS is the sample rate. d is the incremental variable in the summation formula. ax is the x-axis acceleration (accelerometer). n is the sample time, prior to the decimation filter. When using the internal sample clock, fS is equal to 2460 SPS. When using the external clock option, fS is equal to the frequency of the external clock. The frequency external of the clock must be at least 700 Hz to prevent overflow in the delta velocity data registers at high acceleration levels. Each axis of the delta velocity measurements has two output data registers. Figure 26 illustrates how these two registers combine to support 32-bit, twos complement data format, for the x-axis delta velocity measurements. This format also applies to the y- and z-axes as well. X-AXIS DELTA VELOCITY DATA 0 15 15 0 X_ DELTVEL_OUT X_ DELTVEL_LOW Figure 26. Delta Angle Output Data Structure |
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