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ADIS16IMU1/PCBZ 数据表(PDF) 21 Page - Analog Devices |
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ADIS16IMU1/PCBZ 数据表(HTML) 21 Page - Analog Devices |
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21 / 38 page  Data Sheet ADIS16486 Rev. 0 | Page 21 of 38 Table 80. Z_DELTVEL_OUT Register Definition Page ID Addresses Default Access Flash Backup 0x00 0x56, 0x57 Not applicable R No Table 81. Z_DELTVEL_OUT Bit Definition Bits Description (No Default) [15:0] Z-axis delta velocity data, high word, twos complement, ±200 m/sec range, 0 m/sec = 0x0000, 1 LSB = 200 m/sec ÷ 215 = ~6.104 mm/sec Delta Velocity Resolution Table 82 and Table 83 illustrate delta angle data in both 16-bit and 32-bit formats. Table 82. 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 83. 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 (RTC) The VDDRTC power supply pin (see Table 6, Pin 23) provides a separate supply for the RTC function. Connecting the VDDRTC pin to its own 3.3 V supply enables the RTC to keep track of time, even when the main supply (VDD) is off. Note that the VDDRTC power supply must always be connected, even when this function is not used. Configure the RTC function by selecting one of two modes in Bit 0 of the CONFIG register (see Table 147). The RTC data is available in the TIME_MS_OUT (see Table 85), TIME_DH_OUT (see Table 87), and TIME_YM_OUT (see Table 89) registers. 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 similar manner to a stopwatch. When using the clock and calendar mode, write the current time to the real-time registers in the following sequence: second(s) (TIME_MS_OUT, Bits[5:0]), minute(s) (TIME_ MS_OUT, Bits[13:8]), hour(s) (TIME_DH_OUT, Bits[5:0]), day(s) (TIME_DH_OUT, Bits[12:8]), month(s) (TIME_YM_OUT, Bits[3:0]), and year(s) (TIME_YM_OUT, Bits[14:8]). The updates to the timer become active only after a write to TIME_YM_OUT, Bits[14:8] byte completes. The RTC registers reflect the newly updated values only after the next seconds tick of the clock that follows the write to TIME_YM_ OUT, Bits[14:8] (year(s)). Writing to TIME_YM_OUT, Bits[14:8] activates all of the timing values. Therefore, always write to this location last when updating the timer, even if the year information does not require updating. Write the current time to each time data register after setting CONFIG, Bit 0 = 1 (DIN = 0x8003, DIN = 0x8AC1, DIN = 0x8B00). This sequence preserves the factory default for other bits in the CONFIG register. After configuring the CONFIG register, set GLOB_CMD, Bit 3 = 1 (DIN = 0x8003, DIN = 0x8204, DIN = 0x8300) to back up these settings in flash. Even though only VDDRTC must have power for time tracking, access to the time data in the TIME_xx_OUT registers requires normal operation (VDD = 3.3 V and full startup). Even when not using the RTC function, the supply voltage on VDDRTC must meet the conditions in Table 1. RTC: Minutes and Seconds, TIME_MS_OUT Table 84. TIME_MS_OUT Register Definition Page ID Addresses Default Access Flash Backup 0x00 0x78, 0x79 Not applicable R/W No Table 85. TIME_MS_OUT Bit Definitions Bits Description (No Default) [15:14] Not used [13:8] Minute(s), binary data, range = 0 to 59 [7:6] Not used [5:0] Second(s), binary data, range = 0 to 59 RTC: Day and Hour, TIME_DH_OUT Table 86. TIME_DH_OUT Register Definition Page ID Addresses Default Access Flash Backup 0x00 0x7A, 0x7B Not applicable R/W No Table 87. TIME_DH_OUT Bit Definitions Bits Description (No Default) [15:13] Not used [12:8] Day(s), binary data, range = 1 to 31 [7:6] Not used [5:0] Hour(s), binary data, range = 0 to 23 RTC: Year and Month, TIME_YM_OUT Table 88. TIME_YM_OUT Register Definition Page ID Addresses Default Access Flash Backup 0x00 0x7C, 0x7D Not applicable R/W No |
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