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ADXL350BCEZ-RL Arkusz danych(PDF) 14 Page - Analog Devices |
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ADXL350BCEZ-RL Arkusz danych(HTML) 14 Page - Analog Devices |
14 / 36 page ADXL350 Data Sheet Rev. 0 | Page 14 of 36 THEORY OF OPERATION The ADXL350 is a complete 3-axis acceleration measurement system with a selectable measurement range of ±1 g, ±2 g, ±4 g, or ±8 g. It measures both dynamic acceleration resulting from motion or shock and static acceleration, such as gravity, which allows the device to be used as a tilt sensor. The sensor is a polysilicon surface-micromachined structure built on top of a silicon wafer. Polysilicon springs suspend the structure over the surface of the wafer and provide a resistance against acceleration forces. Deflection of the structure is measured using differential capacitors that consist of independent fixed plates and plates attached to the moving mass. Acceleration deflects the beam and unbalances the differential capacitor, resulting in a sensor output whose amplitude is proportional to acceleration. Phase-sensitive demodulation is used to determine the magnitude and polarity of the acceleration. POWER SEQUENCING Power can be applied to VS or VDDI/O in any sequence without damaging the ADXL350. All possible power-on modes are summarized in Table 6. The interface voltage level is set with the interface supply volt- age, VDDI/O, which must be present to ensure that the ADXL350 does not create a conflict on the communication bus. For single-supply operation, VDDI/O can be the same as the main supply, VS. In a dual-supply application, however, VDDI/O can differ from VS to accommodate the desired interface voltage, as long as VS is greater than VDDI/O. After VS is applied, the device enters standby mode, where power consumption is minimized and the device waits for VDDI/O to be applied and for the command to enter measurement mode to be received. (This command can be initiated by setting the measure bit in the POWER_CTL register (Address 0x2D).) In addition, any register can be written to or read from to configure the part while the device is in standby mode. It is recommended to configure the device in standby mode and then to enable measurement mode. Clearing the measure bit returns the device to the standby mode. Table 6. Power Sequencing Condition V S V DDI/O Description Power Off Off Off The device is completely off, but there is the potential for a communication bus conflict. Bus Disabled On Off The device is on in standby mode, but communication is unavailable and creates a conflict on the communication bus. The duration of this state should be minimized during power-up to prevent a conflict. Bus Enabled Off On No functions are available, but the device does not create a conflict on the communication bus. Standby or Measurement On On At power-up, the device is in standby mode, awaiting a command to enter measurement mode, and all sensor functions are off. After the device is instructed to enter measurement mode, all sensor functions are available. |
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