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ADIS16489 Datasheet(PDF) 23 Page - Analog Devices |
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ADIS16489 Datasheet(HTML) 23 Page - Analog Devices |
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23 / 40 page  Data Sheet ADIS16489 Rev. B | Page 23 of 40 The updates to the timer become active only after a write to the TIME_YM_OUT[14:8] byte is complete. The real-time clock registers reflect the newly updated values only after the next seconds tick of the clock that follows the write to TIME_YM_OUT[14:8] (year). Writing to TIME_YM_OUT[14:8] activates all 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[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[3] = 1 (DIN = 0x8003, DIN = 0x8204, DIN = 0x8300) to back up these settings in flash, and use a separate 3.3 V source to supply power to the VDDRTC function. While only VDDRTC needs to 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). Real-Time Clock: Minutes/Seconds (TIME_MS_OUT) Table 86. TIME_MS_OUT Register Definitions Page Addresses Default Access Flash Backup 0x00 0x78, 0x79 Not applicable R/W No Table 87. TIME_MS_OUT Bit Definitions Bits Description [15:14] Not used [13:8] Minutes, binary data, range = 0 to 59 [7:6] Not used [5:0] Seconds, binary data, range = 0 to 59 Real-Time Clock: Days/Hours (TIME_DH_OUT) Table 88. TIME_DH_OUT Register Definitions Page Addresses Default Access Flash Backup 0x00 0x7A, 0x7B Not applicable R/W No Table 89. TIME_DH_OUT Bit Definitions Bits Description [15:13] Not used [12:8] Day, binary data, range = 1 to 31 [7:6] Not used [5:0] Hours, binary data, range = 0 to 23 Real-Time Clock: Years/Months (TIME_YM_OUT) Table 90. TIME_YM_OUT Register Definitions Page Addresses Default Access Flash Backup 0x00 0x7C, 0x7D Not applicable R/W No Table 91. TIME_YM_OUT Bit Definitions Bits Description [15] Not used [14:8] Year, binary data, range = 0 to 99, relative to 2000 A.D. [7:4] Not used [3:0] Month, binary data, range = 1 to 12 Product Identification ( PROD_ID) Table 92. PROD_ID Register Definitions Page Addresses Default Access Flash Backup 0x00 0x7E, 0x7F 0x4069 R Yes Table 93. PROD_ID Bit Definitions Bits Description [15:0] Product identification = 0x4069 The PROD_ID register (see Table 92 and Table 93) contains the numerical portion of the part number (16489). See Figure 17 for an example of how to use a looping read of this register to validate the integrity of the communication. PAGE 2 (PAGE_ID) Table 94. PAGE_ID Register Definition Page Addresses Default Access Flash Backup 0x02 0x00, 0x01 0x0000 R/W No Table 95. PAGE_ID Bit Assignments Bits Description [15:0] Page number, binary numerical format The contents in the PAGE_ID register (see Table 94 and Table 95) contain the current page setting, and provide a control for selecting another page for SPI access. For example, set DIN = 0x8002 to select Page 2 for SPI-based user access. See Table 10 for the page assignments associated with each user accessible register. CALIBRATION The signal chain of each inertial sensor (accelerometers, gyro- scopes) includes application of unique correction formulas, which come from extensive characterization of bias, sensitivity, alignment, and response to linear acceleration (gyroscopes) over a temperature range of −40°C to +85°C for every single ADIS16489. These correction formulas are not accessible, but users do have the opportunity to adjust bias and scale factor, for each sensor individually, through user accessible registers. These correction factors follow immediately after the factory derived correction formulas in the signal chain, which processes at a rate of 2460 Hz when using the internal sample clock (see fS in Figure 33). Calibration, Gyroscope Scale (X_GYRO_SCALE) Table 96. X_GYRO_SCALE Register Definitions Page Addresses Default Access Flash Backup 0x02 0x04, 0x05 0x0000 R/W Yes Table 97. X_GYRO_SCALE Bit Definitions Bits Description [15:0] X-axis gyroscope scale correction; twos complement, 0x0000 = unity gain, 1 LSB = 1 ÷ 215 = ~0.003052% The X_GYRO_SCALE register (see Table 96 and Table 97) provides users with the opportunity to adjust the scale factor for the x-axis gyroscopes. See Figure 27 for an illustration of how this scale factor influences the x-axis gyroscope data. |
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