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PDF BMA020 Data sheet ( Hoja de datos )
| Número de pieza | BMA020 | |
| Descripción | triaxial acceleration sensor | |
| Fabricantes | Bosch | |
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BMA020
Digital, triaxial acceleDBraMtaaAs0th2ei0eot n sensor Bosch Sensortec
Digital, triaxial acceleration sensor
Data sheet
BMA020 Data sheet
Order code
0 273 141 033
Package type
12-pin LGA
Data sheet version
1.1
RReleeva.s1e.d1ate
14-January-2C0o0n8fidential - Page 1
14-Jan-2008
N©otBeossch Sensortec GmbH
copying and passing on to
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Note: Specifications within this document are subject to change without notice.
Free Datasheet http://www.Datasheet4U.com
1 page  
Data sheet
BMA020
Digital, triaxial acceleration sensor
Bosch Sensortec
1. Specification
If not stated otherwise, the given values are maximum values over lifetime and full performance
temperature/voltage range in the normal operation mode.
Table 1: Operating range, output signal and mechanical specifications of BMA020
Parameter
OPERATING RANGE
Symbol
Acceleration range
Supply voltage
analogue
gFS2g
gFS4g
gFS8g
VDD
Supply voltage for
digital I/O
VDDIO
Supply current in
normal mode
IDD
Supply current in
stand-by mode *
IDDsbm
Operating
temperature
TA
ACCELERATION OUTPUT SIGNAL
Acceleration output
resolution
Sensitivity
Sensitivity
temperature drift
Zero-g offset
Zero-g offset
Zero-g offset
temperature drift
Power supply
rejection ratio
S2g
S4g
S8g
TCS
Off
Off
TCO
PSRR
Condition
Switchable via serial
digital interface
VDDIO ≤ VDD
Digital and analog
Digital and analog
Format:
2’s complement
g-range ±2g ,
TA=25°C, x/y-axis
g-range ±2g ,
TA=25°C, z-axis
g-range ±4g,
TA=25°C, all axes
g-range ±8g,
TA=25°C, all axes
Over TA
TA=25°C, calibrated
TA=25°C , over
lifetime
Over TA
Over VDD
Min
-2
-4
-8
2.0
1.62
-40
205
166
83
42
-220
-360
-6
Typ
200
1
256
256
128
64
±0.03
1
Max
2
4
8
3.6
3.6
290
2
+85
Units
g
g
g
V
V
µA
µA
°C
10
307
346
173
86
±0.1
+220
360
+6
0.2
Bit
LSB/g
LSB/g
LSB/g
LSB/g
%/K
mg
mg
mg/K
LSB/V
Rev. 1.1
Confidential - Page 5
14-Jan-2008
© Bosch Sensortec GmbH reserves all rights even in the event of industrial property rights. We reserve all rights of disposal such
copying and passing on to third parties. BOSCH and the symbol are registered trademarks of Robert Bosch GmbH, Germany.
Note: Specifications within this document are subject to change without notice.
Free Datasheet http://www.Datashe
5 Page 
Data sheet
BMA020
Digital, triaxial acceleration sensor
Bosch Sensortec
3.1.3 Bandwidth
These three bits (address 14h, bits 2-0) are used to setup the digital filtering of ADC output data
to obtain the desired bandwidth. A second order analogue filter defines the max. bandwidth to
1.5kHz. Digital filters can be activated to reduce the bandwidth down to 25Hz in order to reduce
signal noise. The digital filters are moving average filters of various length with a refresh rate of
3kHz.
Table 4: Settings of bandwidth
bandwidth<2:0>
000
001
010
011
100
101
110
111
Selected bandwidth (Hz)
25
50
100
190
375
750
1500
Not authorised code
At wake-up from sleep mode to normal operation, the bandwidth is set to its maximum value
and then reduced to bandwidth setting as soon as enough ADC samples are available to fill the
whole digital filter.
Important note:
Please refer to the comment in chapter 3 of how to protect bits 5, 6 and 7 when modifying other
bits of register 14h.
3.1.4 Wake_up
This bit (address 15h, bit 0) makes BMA020 automatically switching from sleep mode to normal
mode after the delay defined by wake_up_pause (section 3.1.5). When the sensor IC goes from
sleep to normal mode, it starts acceleration acquisition and performs interrupt verification
(section 3.2). The sensor IC automatically switches back from normal to sleep mode again if no
fulfilment of programmed interrupt criteria has been detected. The IC wakes-up for a minimum
duration which depends on the number of required valid acceleration data to determine if an
interrupt should be generated.
Example 1:
if bandwidth=110 (1.5kHz), enable_LG=1 and LG_dur=3Fh (63ms),
the sensor IC will need to acquire a minimum number of acceleration data:
i) Wait for 1ms to have a stable acceleration value (wake-up time)
ii) The sensor IC needs max. LG_dur=3Fh=63ms to verify if the
acceleration stays under LG_thres.
Under this example’s condition, the maximum operational time is 1ms+ 63*1ms=64ms.
Rev. 1.1
Confidential - Page 11
14-Jan-2008
© Bosch Sensortec GmbH reserves all rights even in the event of industrial property rights. We reserve all rights of disposal such
copying and passing on to third parties. BOSCH and the symbol are registered trademarks of Robert Bosch GmbH, Germany.
Note: Specifications within this document are subject to change without notice.
Free Datasheet http://www.Datasheet4U.com
11 Page | ||
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| PDF Descargar | [ Datasheet BMA020.PDF ] | |
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