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ADXL362BCCZ-R2 Arkusz danych(PDF) 27 Page - Analog Devices |
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ADXL362BCCZ-R2 Arkusz danych(HTML) 27 Page - Analog Devices |
27 / 44 page Data Sheet ADXL362 Rev. B | Page 27 of 44 ACTIVITY THRESHOLD REGISTERS To detect activity, the ADXL362 compares the absolute value of the 12-bit (signed) acceleration data with the 11-bit (unsigned) THRESH_ACT value. See the Motion Detection section for more information on activity detection. The term, THRESH_ACT, refers to an 11-bit unsigned value com- prising the THRESH_ACT_L register, which holds its eight LSBs; and the THRESH_ACT_H register, which holds its three MSBs. THRESH_ACT is set in codes; the value in g depends on the measurement range setting that is selected. THRESH_ACT [g] = THRESH_ACT [codes]/Sensitivity [codes per g] Address: 0x20, Reset: 0x00, Name: THRESH_ACT_L Address: 0x21, Reset: 0x00, Name: THRESH_ACT_H ACTIVITY TIME REGISTER Address: 0x22, Reset: 0x00, Name: TIME_ACT The activity timer implements a robust activity detection that minimizes false positive motion triggers. When the timer is used, only sustained motion can trigger activity detection. Refer to the Fewer False Positives section for additional information. The value in this register sets the number of consecutive samples that must have at least one axis greater than the activity threshold (set by THRESH_ACT) for an activity event to be detected. The time (in seconds) is given by the following equation: Time = TIME_ACT/ODR where: TIME_ACT is the value set in this register. ODR is the output data rate set in the FILTER_CTL register (Address 0x2C). Setting the activity time to 0x00 has the same result as setting this time to 0x01: Activity is detected when a single acceleration sample has at least one axis greater than the activity threshold (THRESH_ACT). When the accelerometer is in wake-up mode, the TIME_ACT value is ignored and activity is detected based on a single acceleration sample. INACTIVITY THRESHOLD REGISTERS To detect inactivity, the absolute value of the 12-bit acceleration data is compared with the 11-bit (unsigned) THRESH_INACT value. See the Motion Detection section for more information. The term, THRESH_INACT, refers to an 11-bit unsigned value comprised of the THRESH_INACT_L registers, which holds its eight LSBs and the THRESH_INACT_H register, which holds its three MSBs. This 11-bit unsigned value sets the threshold for inactivity detection. This value is set in codes; the value (in g) depends on the measurement range setting selected: THRESH_INACT [g] = THRESH_INACT [codes]/Sensitivity [codes per g] Address: 0x23, Reset: 0x00, Name: THRESH_INACT_L Address: 0x24, Reset: 0x00, Name: THRESH_INACT_H INACTIVITY TIME REGISTERS The 16-bit value in these registers sets the number of consecu- tive samples that must have all axes lower than the inactivity threshold (set by THRESH_INACT) for an inactivity event to be detected. The TIME_INACT_L register holds the eight LSBs and the TIME_INACT_H register holds the eight MSBs of the 16-bit TIME_INACT value. The time in seconds can be calculated as Time = TIME_INACT/ODR where: TIME_INACT is the 16-bit value set by the TIME_INACT_L reg- ister (eight LSBs) and the TIME_INACT_H register (eight MSBs). ODR is the output data rate set in the FILTER_CTL register (Address 0x2C). |
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