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ADXL350BCEZ-RL Arkusz danych(PDF) 14 Page - Analog Devices

Numer części ADXL350BCEZ-RL
Szczegółowy opis  Digital Accelerometer
Download  36 Pages
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Strona internetowa  http://www.analog.com
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ADXL350BCEZ-RL Arkusz danych(HTML) 14 Page - Analog Devices

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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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