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ADIS16489 Datasheet(PDF) 18 Page - Analog Devices |
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ADIS16489 Datasheet(HTML) 18 Page - Analog Devices |
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18 / 40 page  ADIS16489 Data Sheet Rev. B | Page 18 of 40 Table 27. X_GYRO_OUT Bit Definitions Bits Description [15:0] X-axis gyroscope data; high word; twos complement, ±450°/sec range; 0°/sec = 0x0000, 1 LSB = 0.02°/sec The X_GYRO_LOW (see Table 24 and Table 25) and X_GYRO_ OUT (see Table 26 and Table 27) registers contain the gyroscope data for the x-axis. Y-Axis Gyroscope (Y_GYRO_LOW, Y_GYRO_OUT) Table 28. Y_GYRO_LOW Register Definition Page Addresses Default Access Flash Backup 0x00 0x14, 0x15 Not applicable R No Table 29. Y_GYRO_LOW Bit Definitions Bits Description [15:0] Y-axis gyroscope data; low word Table 30. Y_GYRO_OUT Register Definition Page Addresses Default Access Flash Backup 0x00 0x16, 0x17 Not applicable R No Table 31. Y_GYRO_OUT Bit Definitions Bits Description [15:0] Y-axis gyroscope data; high word; twos complement, ±450°/sec range; 0°/sec = 0x0000, 1 LSB = 0.02°/sec The Y_GYRO_LOW (see Table 28 and Table 29) and Y_GYRO_ OUT (see Table 30 and Table 31) registers contain the gyroscope data for the y-axis. Z-Axis Gyroscope (Z_GYRO_LOW, Z_GYRO_OUT) Table 32. Z_GYRO_LOW Register Definition Page Addresses Default Access Flash Backup 0x00 0x18, 0x19 Not applicable R No Table 33. Z_GYRO_LOW Bit Definitions Bits Description [15:0] Z-axis gyroscope data; additional resolution bits Table 34. Z_GYRO_OUT Register Definition Page Addresses Default Access Flash Backup 0x00 0x1A, 0x1B Not applicable R No Table 35. Z_GYRO_OUT Bit Definitions Bits Description [15:0] Z-axis gyroscope data; high word; twos complement, ±450°/sec range; 0°/sec = 0x0000, 1 LSB = 0.02°/sec The Z_GYRO_LOW (see Table 32 and Table 33) and Z_GYRO_ OUT (see Table 34 and Table 35) registers contain the gyroscope data for the z-axis. Gyroscope Resolution Table 36 and Table 37 offer various numerical examples that demonstrate the format of the angular rate (gyroscopes) data in both 16-bit and 32-bit formats. Table 36. 16-Bit Gyroscope Data Format Examples Rotation Rate (°/sec) Decimal Hex Binary +450 +22,500 0x57E4 0101 0111 1110 0100 +0.04 +2 0x0002 0000 0000 0000 0010 +0.02 +1 0x0001 0000 0000 0000 0001 0 0 0x0000 0000 0000 0000 0000 −0.02 −1 0xFFFF 1111 1111 1111 1111 −0.04 −2 0xFFFE 1111 1111 1111 1110 −450 −22,500 0xA81C 1010 1000 0001 1100 Table 37. 32-Bit Gyroscope Data Format Examples Rotation Rate (°/sec) Decimal Hex +450 +1,474,560,000 0x57E40000 +0.02/215 +2 0x00000002 +0.02/216 +1 0x00000001 0 0 0x00000 −0.02/216 −1 0xFFFFFFFF −0.02/215 −2 0xFFFFFFFE −450 −1,474,560,000 0x73600000 ACCELERATION DATA The accelerometers in the ADIS16489 measure both dynamic and static (response to gravity) acceleration along three orthogonal axes (x, y, and z). Figure 20 illustrates the orientation of each accelerometer axis, along with the direction of acceleration that produces a positive response in each of their measurements. PIN 1 PIN 23 aY Y-AXIS X-AXIS aX Z-AXIS aZ Figure 20. Accelerometer Axis and Polarity Assignments Each accelerometer has two output data registers. Figure 21 illustrates how these two registers combine to support a 32-bit, twos complement data format for the x-axis accelerometer measurements. This format also applies to the y- and z-axes as well. X-AXIS ACCELEROMETER DATA 0 15 15 0 X_ACCL_OUT X_ACCL_LOW Figure 21. Accelerometer Output Data Structure |
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