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ADXL343BCCZ-RL7 数据表(PDF) 11 Page - Analog Devices

部件名 ADXL343BCCZ-RL7
功能描述  Digital MEMS Accelerometer
Download  36 Pages
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制造商  AD [Analog Devices]
网页  http://www.analog.com
标志 AD - Analog Devices

ADXL343BCCZ-RL7 数据表(HTML) 11 Page - Analog Devices

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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.


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