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ADIS16385 Datasheet(PDF) 12 Page - Analog Devices |
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ADIS16385 Datasheet(HTML) 12 Page - Analog Devices |
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12 / 20 page  ADIS16385 Preliminary Technical Data Rev. PrA | Page 12 of 20 SYSTEM FUNCTIONS The ADIS16385 provides a number of system-level controls for managing its operation, using the registers in Table 14. Table 14. System Tool Registers Register Name Address Description MSC_CTRL 0x34 Self-test, calibration, data-ready SLP_CTRL 0x3A Sleep mode control DIAG_STAT 0x3C Error flags GLOB_CMD 0x3E Single-command functions LOT_ID1 0x52 Lot Identification Code 1 LOT_ID2 0x54 Lot Identification Code 2 PROD_ID 0x56 Product identification: SERIAL_NUM 0x58 Serial number GLOBAL COMMANDS The GLOB_CMD register in Table 15 provides trigger bits for device reset, flash memory management, DAC control, and calibration control. Start each of these functions by writing a 1 to the assigned bit in GLOB_CMD. After completing the task, the bit automatically returns to zero. For example, set GLOB_CMD[7] = 1 (DIN = 0xBE80) to initiate a software reset, which stops the sensor operation and runs the device through its startup sequence. Set GLOB_CMD[3] = 1 (DIN = 0xBE04) to back up the user register contents in nonvolatile flash. This sequence includes loading the control registers with the data in their respective flash memory locations prior to producing new data. Table 15. GLOB_CMD Bit Descriptions Bits Description (Default = 0x0000) Execution Time1 [15:8] Not used N/A [7] Software reset 4 ms [6:4] Not used N/A [3] Flash update 75 ms [2] Auxiliary DAC data latch 75 ms [1] Factory calibration restore 75 ms [0] Automatic bias correction N/A2 1 N/A = not applicable. 2 Execution time is dependent on SMPL_PRD[12:8] setting. POWER MANAGEMENT The SLP_CTRL register, in Table 16, provides two different sleep modes for system-level management: normal and timed. Set SLP_CTRL[8] = 1 (DIN = 0xBB01) to start normal sleep mode. When the device is in sleep mode, the following events can cause it to wake-up: assert CS from high to low, assert RST from high to low, or cycle the power. Use SLP_CTRL[7:0] to put the device into sleep mode for a specified period. For example, SLP_CNT[7:0] = 0x64 (DIN = 0xBA64) puts the ADIS16385 to sleep for 50 sec. Table 16. SLP_CTRL Bit Descriptions Bits Description (Default = 0x0000) [15:9] Not used [8] Normal sleep mode, (1 = start sleep mode) [7:0] Timed sleep mode (write 0x01 to 0xFF to start). Sleep mode duration, binary, 0.5 sec/LSB PRODUCT IDENTIFICATION The PROD_ID register in Table 19 contains the binary equivalent of 16,385. It provides a product-specific variable for systems that need to track this in their system software. The LOT_ID1 and LOT_ID2 registers in Table 17 combine to provide a unique, 32-bit lot identification code. The SERIAL_NUM register in Table 18 contains a binary number that represents the serial number on the device label. The assigned serial numbers in SERIAL_NUM are lot specific. Table 17. LOT_ID1, LOT_ID2 Bit Descriptions Bits Description (Default = 0x0000) [15:0] Lot identification, binary code Table 18. SERIAL_NUM Bit Descriptions Bits Description (Default = 0x0000) [15:14] Reserved [13:0] Serial number, 1 to 9999 (0x270F) Table 19. PROD_ID Bit Descriptions Bits Description (Default = 0x0000) [15:0] Product identification = 0x4001 MEMORY MANAGEMENT The FLASH_CNT register in Table 20 provides a 16-bit counter that helps track the number of write cycles to the nonvolatile flash memory. The flash updates every time any of the following bits are set to 1: GLOB_CMD[3] and GLOB[1:0]. Table 20. FLASH_CNT Bit Descriptions Bits Description [15:0] Binary counter |
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