EVAL-ADXL346Z Analog Devices Inc, EVAL-ADXL346Z Datasheet - Page 13

no-image

EVAL-ADXL346Z

Manufacturer Part Number
EVAL-ADXL346Z
Description
Inertial Sensor Evaluation System
Manufacturer
Analog Devices Inc
Datasheets

Specifications of EVAL-ADXL346Z

Silicon Manufacturer
Analog Devices
Silicon Core Number
ADXL346
Kit Application Type
Sensing - Motion / Vibration / Shock
Application Sub Type
Accelerometer
Silicon Family Name
IMEMS
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
POWER SAVINGS
Power Modes
The ADXL346 automatically modulates its power consumption
in proportion to its output data rate, as outlined in Table 7. 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 Hz to 400 Hz data rate
range at the expense of slightly greater noise. To enter low
power mode, set the LOW_POWER bit (Bit D4) in the BW_RATE
register (Address 0x2C). The current consumption in low power
mode is shown in Table 8 for cases where there is an advantage
to using low power mode. Use of low power mode for a data
rate not shown in Table 8 does not provide any advantage over
the same data rate in normal power mode. Therefore, it is
recommended that only data rates listed in Table 8 be used in
low power mode. The current consumption values shown in
Table 7 and Table 8 are for a V
Table 7. Typical Current Consumption vs. Data Rate
(T
Output Data
Rate (Hz)
3200
1600
800
400
200
100
50
25
12.5
6.25
3.13
1.56
0.78
0.39
0.20
0.10
A
= 25°C, V
S
= 2.6 V, V
Bandwidth (Hz)
1600
800
400
200
100
50
25
12.5
6.25
3.13
1.56
0.78
0.39
0.20
0.10
0.05
DD I/O
S
= 1.8 V)
of 2.6 V.
Rate Code
1111
1110
1101
1100
1011
1010
1001
1000
0111
0110
0101
0100
0011
0010
0001
0000
I
140
90
140
140
140
140
90
55
40
31
27
23
23
23
23
23
DD
(μA)
Rev. A | Page 13 of 40
Table 8. Typical Current Consumption vs. Data Rate, Low
Power Mode (T
Output Data
Rate (Hz)
400
200
100
50
25
12.5
Autosleep Mode
Additional power can be saved if the ADXL346 automatically
switches to sleep mode during periods of inactivity. To enable
this feature, set the THRESH_INACT register (Address 0x25)
and the TIME_INACT register (Address 0x26) each to a value
that signifies inactivity (the appropriate value depends on the
application), and then set the AUTO_SLEEP bit (Bit D4) and the
link bit (Bit D5) in the POWER_CTL register (Address 0x2D).
Current consumption at the sub-8 Hz data rates used in this
mode is typically 23 μA for a V
Standby Mode
For even lower power operation, standby mode can be used.
In standby mode, current consumption is reduced to 0.2 μA
(typical). In this mode, no measurements are made. Standby mode
is entered by clearing the measure bit (Bit D3) in the
POWER_CTL register (Address 0x2D). Placing the device into
standby mode preserves the contents of FIFO.
A
= 25°C, V
Bandwidth (Hz)
200
100
50
25
12.5
6.25
S
= 2.6 V, V
S
of 2.6 V.
DD I/O
Rate Code
1100
1011
1010
1001
1000
0111
= 1.8 V)
ADXL346
I
90
55
40
31
27
23
DD
(μA)

Related parts for EVAL-ADXL346Z