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ADXL343BCCZ-RL7 数据表(PDF) 11 Page - Analog Devices |
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ADXL343BCCZ-RL7 数据表(HTML) 11 Page - Analog Devices |
11 / 36 page Data Sheet ADXL343 Rev. 0 | Page 11 of 36 THEORY OF OPERATION The ADXL343 is a complete 3-axis acceleration measurement system with a selectable measurement range of ±2 g, ±4 g, ±8 g, or ±16 g. It measures both dynamic acceleration resulting from motion or shock and static acceleration, such as gravity, that 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 forces due to applied acceleration. 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 proof mass and unbalances the differential capacitor, resulting in a sensor output whose ampli- tude 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 VDD I/O in any sequence without damaging the ADXL343. All possible power-on modes are summarized in Table 6. The interface voltage level is set with the interface supply voltage, VDDI/O, which must be present to ensure that the ADXL343 does not create a conflict on the communication bus. For single-supply operation, VDD I/O can be the same as the main supply, VS. In a dual-supply application, however, VDD I/O can differ from VS to accommodate the desired interface voltage, as long as VS is greater than or equal to VDDI/O. After VS is applied, the device enters standby mode, where power consumption is minimized and the device waits for VDD I/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 (Bit D3) in the POWER_CTL register (Address 0x2D).) In addition, while the device is in standby mode, any register can be written to or read from to configure the part. 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 VS VDD I/O Description Power Off Off Off The device is completely off, but there is a 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. |
类似零件编号 - ADXL343BCCZ-RL7 |
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类似说明 - ADXL343BCCZ-RL7 |
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