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ADXL345BCCZ-RL71 Datasheet(Arkusz danych) 7 Page - Analog Devices

Numer części ADXL345BCCZ-RL71
Szczegółowy opis  Three-Axis, ±2/4/8/16g Digital Accelerometer
Pobierz  24 Pages
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Producent  AD [Analog Devices]
Strona internetowa  http://www.analog.com
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Preliminary Technical Data
ADXL345
Rev. PrA | Page 7 of 24
FUNCTIONAL DESCRIPTION
DEVICE OPERATION
The ADXL345 is a complete three-axis acceleration
measurement system with a selectable measurement range of
either ±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, which allows it 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 may be applied to VS or VDD I/O in any sequence without
damaging the ADXL345. All possible power on states are
summarized in Table 4. The interface voltage level is set with
the interface supply voltage VDD I/O, which must be present to
ensure that the ADXL345 does not create a conflict on the
communications bus. For single-supply operation, VDD I/O can be
the same as the main supply, VS. Conversely, in a dual-supply
application, VDD I/O can differ from VS to accommodate the
desired interface voltage. Once VS is applied, the device enters
standby state, where power consumption is minimized and the
device waits for VDD I/O to be applied and a command to enter
measurement state (setting the MEASURE bit in the
POWER_CTL register). Clearing the MEASURE bit returns the
device to standby state.
Table 4. Power Sequencing
Condition
VS VDD I/O Description
Power Off
Off
Off
Completely off, potential for
communications bus conflict.
Bus Enabled
Off
On
No functions available, but will not create
conflict on communications 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. Once
instructed to enter Measurement mode, all
sensor functions are available.
POWER SAVING
Power Modes
The ADXL345 automatically modulates its power consumption
proportionally with its output data rate as shown in Table 5. If
additional power savings is desired, a lower power mode is
available. In this mode, the internal sampling rate is reduced
allowing for power savings in the 12.5 to 400Hz data rate range
at the expense of slightly greater noise. To enter lower power
mode, set the LOW_POWER bit(D4) in the BW_RATE
register.
Table 5. Current Consumption versus Data Rate
Output Data
Rate (Hz)
Bandwidth
(Hz)
Rate Code
IDD (µA)
3200
1600
1111
130
1600
800
1110
80
800
400
1101
130
400
200
1100
130
200
100
1011
130
100
50
1010
130
50
25
1001
80
25
12.5
1000
55
12.5
6.25
0111
37
6.25
3.125
0110
25
3.125
1.563
0101
25
1.563
0.782
0100
25
0.782
0.39
0011
25
0.39
0.195
0010
25
0.195
0.098
0001
25
0.098
0.048
0000
25
The current consumption in Low Power Mode is shown in
Table 6. Cases where there is no advantage to using Low Power
Mode are shaded.
Table 6. Current Consumption versus Data Rate in Low
Power Mode
Output
Data Rate
Bandwidth
(Hz)
Rate Code
IDD (µA)
3200
1600
1111
130
1600
800
1110
80
800
400
1101
130
400
200
1100
80
200
100
1011
55
100
50
1010
37
50
25
1001
30
25
12.5
1000
25
12.5
6.25
0111
25
6.25
3.125
0110
25
3.125
1.563
0101
25
1.563
0.782
0100
25
0.782
0.39
0011
25
0.39
0.195
0010
25
0.195
0.098
0001
25
0.098
0.048
0000
25




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