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ADXL350BCEZ-RL Arkusz danych(PDF) 25 Page - Analog Devices |
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ADXL350BCEZ-RL Arkusz danych(HTML) 25 Page - Analog Devices |
25 / 36 page Data Sheet ADXL350 Rev. 0 | Page 25 of 36 result in undesirable behavior if the free-fall interrupt is enabled. Values between 300 mg and 600 mg (0x0A to 0x13) are recommended. Register 0x29—TIME_FF (Read/Write) The TIME_FF register is eight bits and stores an unsigned time value representing the minimum time that the RSS value of all axes must be less than THRESH_FF to generate a free-fall interrupt. The scale factor is 5 ms/LSB. A value of 0 may result in undesirable behavior if the free-fall interrupt is enabled. Values between 100 ms and 350 ms (0x14 to 0x46) are recommended. Register 0x2A—TAP_AXES (Read/Write) D7 D6 D5 D4 D3 D2 D1 D0 0 0 0 0 Suppress TAP_X enable TAP_Y enable TAP_Z enable Suppress Bit Setting the suppress bit suppresses double tap detection if acceleration greater than the value in THRESH_TAP is present between taps. See the Tap Detection section for more details. TAP_x Enable Bits A setting of 1 in the TAP_X enable, TAP_Y enable, or TAP_Z enable bit enables x-, y-, or z-axis participation in tap detection. A setting of 0 excludes the selected axis from participation in tap detection. Register 0x2B—ACT_TAP_STATUS (Read Only) D7 D6 D5 D4 D3 D2 D1 D0 0 ACT_X source ACT_Y source ACT_Z source Asleep TAP_X source TAP_Y source TAP_Z source ACT_x Source and TAP_x Source Bits These bits indicate the first axis involved in a tap or activity event. A setting of 1 corresponds to involvement in the event, and a setting of 0 corresponds to no involvement. When new data is available, these bits are not cleared but are overwritten by the new data. The ACT_TAP_STATUS register should be read before clearing the interrupt. Disabling an axis from participation clears the corresponding source bit when the next activity or tap/double tap event occurs. Asleep Bit A setting of 1 in the asleep bit indicates that the part is asleep, and a setting of 0 indicates that the part is not asleep. See the Register 0x2D—POWER_CTL (Read/Write) section for more information on autosleep mode. Register 0x2C—BW_RATE (Read/Write) D7 D6 D5 D4 D3 D2 D1 D0 0 0 0 LOW_POWER Rate LOW_POWER Bit A setting of 0 in the LOW_POWER bit selects normal operation, and a setting of 1 selects reduced power operation, which has somewhat higher noise (see the Power Modes section for details). Rate Bits These bits select the device bandwidth and output data rate (see Table 7 and Table 8 for details). The default value is 0x0A, which translates to a 100 Hz output data rate. An output data rate should be selected that is appropriate for the communication protocol and frequency selected. Selecting too high of an output data rate with a low communication speed results in samples being discarded. Register 0x2D—POWER_CTL (Read/Write) D7 D6 D5 D4 D3 D2 D1 D0 0 0 Link AUTO_SLEEP Measure Sleep Wakeup Link Bit A setting of 1 in the link bit with both the activity and inactivity functions enabled delays the start of the activity function until inactivity is detected. After activity is detected, inactivity detection begins, preventing the detection of activity. This bit serially links the activity and inactivity functions. When this bit is set to 0, the inactivity and activity functions are concurrent. Additional information can be found in the Link Mode section. When clearing the link bit, it is recommended that the part be placed into standby mode and then set back to measurement mode with a subsequent write. This is done to ensure that the device is properly biased if sleep mode is manually disabled; otherwise, the first few samples of data after the link bit is cleared may have additional noise, especially if the device was asleep when the bit was cleared. AUTO_SLEEP Bit If the link bit is set, a setting of 1 in the AUTO_SLEEP bit sets the ADXL350 to switch to sleep mode when inactivity is detected (that is, when acceleration has been below the THRESH_INACT value for at least the time indicated by TIME_INACT). A setting of 0 disables automatic switching to sleep mode. See the description of the sleep bit in this section for more information. When clearing the AUTO_SLEEP bit, it is recommended that the part be placed into standby mode and then set back to measure- ment mode with a subsequent write. This is done to ensure that the device is properly biased if sleep mode is manually disabled; otherwise, the first few samples of data after the AUTO_SLEEP bit is cleared may have additional noise, especially if the device was asleep when the bit was cleared. Measure Bit A setting of 0 in the measure bit places the part into standby mode, and a setting of 1 places the part into measurement mode. The ADXL350 powers up in standby mode with minimum power consumption. Sleep Bit A setting of 0 in the sleep bit puts the part into the normal mode of operation, and a setting of 1 places the part into sleep mode. Sleep mode suppresses DATA_READY, stops transmission of data |
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