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ADIS16COM1/PCBZ 数据表(PDF) 29 Page - Analog Devices |
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ADIS16COM1/PCBZ 数据表(HTML) 29 Page - Analog Devices |
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29 / 37 page  Preliminary Technical Data ADIS16000/ADIS16229 Rev. PrA | Page 29 of 37 FFT EVENT HEADER Each FFT record has an FFT header that contains information that fills all of the registers listed in Table 69. The information in these registers contains recording time, record configuration settings, status/error flags, and several alarm outputs. The registers listed in Table 69 update with every record event and also update with record-specific information when using GLOB_CMD[13] (see Table 74) to retrieve a data set from the FFT record in flash memory. Table 69. FFT Header Register Information Register Address Description DIAG_STAT 0x34 Alarm status ALM_X_STAT 0x38 X-axis alarm status ALM_Y_STAT 0x3A Y-axis alarm status ALM_X_PEAK 0x3C X-axis alarm peak ALM_Y_PEAK 0x3E Y-axis alarm peak TIME_STMP_L 0x40 Time stamp, lower word TIME_STMP_H 0x42 Time stamp, upper word ALM_X_FREQ 0x44 X-axis alarm frequency of peak alarm ALM_Y_FREQ 0x46 Y-axis alarm frequency of peak alarm REC_INFO1 0x4C FFT record header information REC_INFO2 0x4E FFT record header information The REC_INFO1 register (see Table 70) and the REC_INFO2 register (see Table 71) capture the settings associated with the current FFT record. Table 70. REC_INFO1 Page 1-6, Low Byte Address = 0x4E), 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 71. REC_INFO2 Page 1-6, Low Byte Address = 0x4E, Read Only Bits Description [15:4] Not used (don’t care) [3:0] AVG_CNT setting The TIME_STMP_x registers (see Table 72 and Table 73) provide a relative time stamp that identifies the time for the current FFT record. Table 72. TIME_STMP_L Page 1-6, Low Byte Address = 0x40, Read Only Bits Description (Default = 0x0000) [15:0] Record time stamp, low integer, binary, seconds Table 73. TIME_STMP_H Page 1-6, Low Byte Address = 0x42, Read Only Bits Description (Default = 0x0000) [15:0] Record time stamp, high integer, binary, seconds |
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