EVAL-ADXL345Z-DB Analog Devices Inc, EVAL-ADXL345Z-DB Datasheet - Page 34

• Manufacturer Part Number: EVAL-ADXL345Z-DB
• Description: BOARD EVAL FOR ADXL345
• Manufacturer: Analog Devices Inc
• Series: iMEMS®r

Specifications of EVAL-ADXL345Z-DB

• Sensor Type: Accelerometer, 3 Axis
• Sensing Range: ±2g, 4g, 8g, 16g
• Interface: I²C, SPI
• Sensitivity: 256LSB/g, 128LSB/g, 64LSB/g, 32LSB/g
• Voltage - Supply: 2 V ~ 3.6 V
• Embedded: No
• Utilized Ic / Part: ADXL345
• Silicon Manufacturer: Analog Devices
• Application Sub Type: Accelerometer - Three-Axis
• Kit Application Type: Sensing - Motion / Vibration / Shock
• Silicon Core Number: ADXL345
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

ADXL345
Changes in noise performance, self-test response, and supply
current are discussed elsewhere throughout the data sheet. For
noise performance, the Noise Performance section should be
reviewed. The Using Self-Test section discusses both the
operation of self-test over voltage, a square relationship with
supply voltage, as well as the conversion of the self-test response
in g’s to LSBs. Finally, Figure 33 shows the impact of supply
voltage on typical current consumption at a 100 Hz output data
rate, with all other output data rates following the same trend.
OFFSET PERFORMANCE AT LOWEST DATA RATES
The ADXL345 offers a large number of output data rates and
bandwidths, designed for a large range of applications. However,
at the lowest data rates, described as those data rates below 6.25 Hz,
the offset performance over temperature can vary significantly
from the remaining data rates. Figure 53, Figure 54, and Figure 55
show the typical offset performance of the ADXL345 over
temperature for the data rates of 6.25 Hz and lower. All plots
are normalized to the offset at 100 Hz output data rate; therefore,
a nonzero value corresponds to additional offset shift due to
temperature for that data rate.
When using the lowest data rates, it is recommended that the
operating temperature range of the device be limited to provide
minimal offset shift across the operating temperature range.
Due to variability between parts, it is also recommended that
calibration over temperature be performed if any data rates
below 6.25 Hz are in use.
Figure 53. Typical X-Axis Output vs. Temperature at Lower Data Rates,
140
120
100
80
60
40
20
0
25
0.10Hz
0.20Hz
0.39Hz
0.78Hz
1.56Hz
3.13Hz
6.25Hz
35
45
TEMPERATURE (°C)
55
65
75
85
Rev. B | Page 34 of 40
Figure 54. Typical Y-Axis Output vs. Temperature at Lower Data Rates,
Figure 55. Typical Z-Axis Output vs. Temperature at Lower Data Rates,
140
120
100
140
120
100
–20
80
60
40
20
80
60
40
20
0
0
Normalized to 100 Hz Output Data Rate, V
Normalized to 100 Hz Output Data Rate, V
Normalized to 100 Hz Output Data Rate, V
25
25
0.10Hz
0.20Hz
0.39Hz
0.78Hz
1.56Hz
3.13Hz
6.25Hz
0.10Hz
0.20Hz
0.39Hz
0.78Hz
1.56Hz
3.13Hz
6.25Hz
35
35
45
TEMPERATURE (°C)
45
TEMPERATURE (°C)
55
55
65
65
S
S
S
75
75
= 2.5 V
= 2.5 V
= 2.5 V
85
85