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ADIS16228/PCBZ 数据表(PDF) 22 Page - Analog Devices |
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ADIS16228/PCBZ 数据表(HTML) 22 Page - Analog Devices |
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22 / 28 page  ADIS16228 Data Sheet Rev. B | Page 22 of 28 FFT EVENT HEADER Each FFT record has an FFT header that contains information that fills all of the registers listed in Table 58. The information in these registers contains recording time, record configuration settings, status/error flags, and several alarm outputs. The registers listed in Table 58 update with every record event and also update with record-specific information when using GLOB_CMD[13] (see Table 64) to retrieve a data set from the FFT record in flash memory. Table 58. FFT Header Register Information Register Address Description DIAG_STAT 0x3C Alarm status ALM_X_STAT 0x40 X-axis alarm status ALM_Y_STAT 0x42 Y-axis alarm status ALM_Z_STAT 0x44 Z-axis alarm status ALM_X_PEAK 0x46 X-axis alarm peak ALM_Y_PEAK 0x48 Y-axis alarm peak ALM_Z_PEAK 0x4A Z-axis alarm peak TIME_STMP_L 0x4C Time stamp, lower word TIME_STMP_H 0x4E Time stamp, upper word REC_INFO1 0x6E FFT record header information ALM_X_FREQ 0x70 X-axis alarm frequency of peak alarm ALM_Y_FREQ 0x72 Y-axis alarm frequency of peak alarm ALM_Z_FREQ 0x74 Z-axis alarm frequency of peak alarm REC_INFO2 0x76 FFT record header information The REC_INFO1 register (see Table 59) and the REC_INFO2 register (see Table 60) capture the settings associated with the current FFT record. Table 59. REC_INFO1 (Base Address = 0x6E), Read Only Bits Description [15:14] Sample rate option 00 = SR0, 01 = SR1, 10 = SR2, 11 = SR3 [13:12] Window setting 00 = rectangular, 01 = Hanning, 10 = flat top, 11 = N/A [11:10] Signal range 00 = 1 g, 01 = 5 g, 10 = 10 g, 11 = 20 g [9:8] Not used (don’t care) [7:0] FFT averages; range = 1 to 255 Table 60. REC_INFO2 (Base Address = 0x76), Read Only Bits Description [15:4] Not used (don’t care) [3:0] AVG_CNT setting The TIME_STMP_x registers (see Table 61 and Table 62) provide a relative time stamp that identifies the time for the current FFT record. Table 61. TIME_STMP_L (Base Address = 4C), Read Only Bits Description (Default = 0x0000) [15:0] Record time stamp, low integer, binary, seconds Table 62. TIME_STMP_H (Base Address = 0x4E), Read Only Bits Description (Default = 0x0000) [15:0] Record time stamp, high integer, binary, seconds |
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