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ADIS16489 Datasheet(PDF) 22 Page - Analog Devices |
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ADIS16489 Datasheet(HTML) 22 Page - Analog Devices |
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22 / 40 page  ADIS16489 Data Sheet Rev. B | Page 22 of 40 X-Axis Delta Velocity (X_DELTVEL_LOW, X_DELTVEL_OUT) Table 72. X_DELTVEL_LOW Register Definitions Page Addresses Default Access Flash Backup 0x00 0x4C, 0x4D Not applicable R No Table 73. X_DELTVEL_LOW Bit Definitions Bits Description [15:0] X-axis delta angle data; low word Table 74. X_DELTVEL_OUT Register Definitions Page Addresses Default Access Flash Backup 0x00 0x4E, 0x4F Not applicable R No Table 75. X_DELTVEL_OUT Bit Definitions 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 = ~6.104 mm/sec The X_DELTVEL_LOW (see Table 72 and Table 73) and X_DELTVEL_OUT (see Table 74 and Table 75) registers contain the delta velocity data for the x-axis. Y-Axis Delta Velocity (Y_DELTVEL_LOW, Y_DELTVEL_OUT) Table 76. Y_DELTVEL_LOW Register Definitions Page Addresses Default Access Flash Backup 0x00 0x50, 0x51 Not applicable R No Table 77. Y_DELTVEL_LOW Bit Definitions Bits Description [15:0] Y-axis delta velocity data; low word Table 78. Y_DELTVEL_OUT Register Definitions Page Addresses Default Access Flash Backup 0x00 0x52, 0x53 Not applicable R No Table 79. Y_DELTVEL_OUT Bit Definitions Bits Description [15:0] Y-axis delta velocity data; twos complement, ±50 m/sec range, 0 m/sec = 0x0000; 1 LSB = 50 m/sec ÷ 215 = ~1.526 mm/sec The Y_DELTVEL_LOW (see Table 76 and Table 77) and Y_DELTVEL_OUT (see Table 78 and Table 79) registers contain the delta velocity data for the y-axis. Z-Axis Delta Velocity (Z_DELTVEL_LOW, Z_DELTVEL_OUT) Table 80. Z_DELTVEL_LOW Register Definitions Page Addresses Default Access Flash Backup 0x00 0x54, 0x55 Not applicable R No Table 81. Z_DELTVEL_LOW Bit Definitions Bits Description [15:0] Z-axis delta angle data; low word Table 82. Z_DELTANG_OUT Register Definitions Page Addresses Default Access Flash Backup 0x00 0x56, 0x57 Not applicable R No Table 83. Z_DELTVEL_OUT Bit Definitions 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 = ~6.104 mm/sec The Z_DELTVEL_LOW (see Table 80 and Table 81) and Z_DELTVEL_OUT (see Table 82 and Table 83) registers contain the delta velocity data for the z-axis. Delta Velocity Resolution Table 84 and Table 85 offer various numerical examples that demonstrate the format of the delta velocity data in both 16-bit and 32-bit formats. Table 84. 16-Bit Delta Velocity Data Format Examples Velocity (m/sec) Decimal Hex Binary +200 × (215 − 1)/215 +32,767 0x7FFF 0111 1111 1110 1111 +200/214 +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 −200/214 −2 0xFFFE 1111 1111 1111 1110 −200 −32,768 0x8000 1000 0000 0000 0000 Table 85. 32-Bit Delta Velocity Data Format Examples Velocity (m/sec) Decimal Hex +200 × (231 − 1)/231 +2,147,483,647 0x7FFFFFFF +200/230 +2 0x00000002 +200/231 +1 0x00000001 0 0 0x00000000 −200/231 −1 0xFFFFFFFF −200/230 −2 0xFFFFFFFE −200 −2,147,483,648 0x80000000 REAL-TIME CLOCK The VDDRTC power supply pin (see Table 6, Pin 23) provides a separate supply for the real-time clock (RTC) function. Connect- ing the VDDTC pin to its own 3.3 V supply enables the RTC to keep track of time, even when the main supply (VDD) is off. Configure the RTC function by selecting one of two modes in CONFIG[0] (see Table 157). The real-time clock data is available in the TIME_MS_OUT register (see Table 87), TIME_DH_OUT register (see Table 89), and TIME_YM_OUT register (see Table 91). When using the elapsed timer mode, the time data registers start at 0x0000 when the device starts up (or resets) and begin keeping time in a manner that is similar to a stopwatch. When using the clock/calendar mode, write the current time to the real-time registers in the following sequence: seconds (TIME_ MS_OUT[5:0]), minutes (TIME_ MS_OUT[13:8]), hours (TIME_DH_OUT[5:0]), day (TIME_DH_OUT[12:8]), month (TIME_YM_OUT[3:0]), and year (TIME_YM_OUT[14:8]). |
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