BMA020 Bosch Sensortec, BMA020 Datasheet - Page 45

• Manufacturer Part Number: BMA020
• Description: 3-AXIS ACCELEROMETER DIGITAL I/F
• Manufacturer: Bosch Sensortec

Specifications of BMA020

• Axis: X, Y, Z
• Acceleration Range: ± 2g, 4g, 8g
• Sensitivity: 256LSB/g, 128LSB/g, 64LSB/g
• Voltage - Supply: 2 V ~ 3.6 V
• Output Type: Digital
• Bandwidth: 3kHz
• Interface: I²C, SPI
• Mounting Type: Surface Mount
• Package / Case: 12-LGA
• For Use With: 828-1014 - BMA020 TRIBOX DEMO BOARD W/USB828-1008 - BMA020 DAUGHTERCARD FOR DEV KIT
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 828-1000-2

So, the relevant parameters for power consumption in self-wake up mode are:
As some of these parameters have certain deviations from the typical value results of various
example Monte Carlo Simulations on the current consumption are shown in figures 25, 26 and
27.
The graphs provide an indication on the expected current consumption for different settings.
Figure 25: Estimation of current consumption using Monte Carlo simulation,
example #1: bandwidth 750Hz, 2560ms wake-up setting, any-motion interrupt
Rev. 1.2
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Note: Specifications within this document are subject to change without notice.
800
800
700
700
600
600
500
500
400
400
300
300
200
200
100
100
0
0
1.1
1.1
- the current consumption in normal mode
- the current consumption in sleep mode
- the self-wake up pause duration
- the bandwidth (ie. length of digital filter to be filled for one data point)
- the interrupt criteria (determines the duration of normal operation):
MW
MW
3s
3s
yield 100 %
yield 100 %
1.2
1.2
0.174 µA
0.174 µA
1.41 µA
1.41 µA
1.3
1.3
i_self_w ake_up [µA]
i_self_w ake_up [µA]
CurrentSelfWakeUp
CurrentSelfWakeUp
1.4
1.4
•
•
high-g and low-g criteria (ie. acquisition of one data point)
any-motion criterion (ie. four data points)
1.5
1.5
Digital, triaxial acceleration sensor
1.6
1.6
1.7
1.7
Data sheet
BMA020
Page 45
1.8
1.8
Bosch Sensortec
30 May 2008