BMA140
Data sheet
Triaxial, analog acceleration sensor
Bosch Sensortec
BMA140 - triaxial
±4g
analog accelerometer
Key features
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Triaxial, ±4g full scale accelerometer
Standard LGA package with 3mm x 3mm footprint, 0.9mm height
2 operation modes: Stand-by- and normal mode
Ultra-low power consumption:
- 200µA in operation mode
- 0.9µA in stand-by mode
Only 1 ms turn-on time form stand-by mode to operation mode
Analog output signals: 3 parallel (X, Y, Z) plus 1 serial (multiplexed X, Y, Z)
Internal 1.5kHz 1
st
-order low-pass analog filter
Customizable corner frequency
On-chip gain and offset compensation, calibrated on factory level.
Trigger-able self-test capability of MEMS sensor element and ASIC
RoHS compliant and Pb-free
Based on automotive-proven Bosch MEMS wafer-fabrication technology & processes
Typical applications
Tilt, motion and vibration sensing in
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Gaming
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Virtual reality
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Sports- and life style wear
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Cell-phones
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Handhelds, PDAs, PNDs
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Healthcare
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Patient monitoring
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Navigation
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Electronic compass compensation
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Computer peripherals
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Man-machine interfaces
Rev. 1.1
Page 2
04 April 2008
© Bosch Sensortec GmbH reserves all rights even in the event of industrial property rights. We reserve all rights of disposal such
as 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.
BMA140
Data sheet
Triaxial, analog acceleration sensor
Bosch Sensortec
The BMA140 in general
The BMA140 is a triaxial low-g acceleration sensor for consumer market applications, available
in a standard SMD LGA package with a footprint of 3x3mm
2
and a height of only 0.9mm. It
allows measurements of static as well as dynamic accelerations. Due to its three perpendicular
axes it gives the absolute orientation in a gravity field
and enables free fall detection.
As all
other Bosch inertial sensors, the BMA140 is a two-chip arrangement, which combines an
application-specific integrated circuit (ASIC) with a three-channel silicon accelerometer, to form
a true micro electro mechanical system (MEMS).
The ASIC evaluates the output of the acceleration-sensing element, corresponding to the
differential capacitance principle. The underlying MEMS technology processes have proven
their capability according to the strictest automotive standards in more than 100 million Bosch
inertial sensors a year so far.
The BMA140 provides 3 parallel analog output signals in a
±4g
acceleration range. All
acceleration signals are permanently available on 3 independent analog pads through 33kΩ
resistors on each pad. This allows the user defining the signal bandwidth by the mean of
external capacitors connected between each channel output and ground. Additional to the
parallel X, Y and Z output signals there is the option to multiplex any axis to one supplementary
output pin in a freely customized manner. This allows the user to connect the triaxial BMA140 to
an economical single channel AD converter without loss of axis information.
For each axis, an independent analog 1.5 kHz 1
st
-order low-pass filter is included to provide
preconditioning of the measured acceleration signal. The corner frequency of this filter can
easily be customized. Additional signal preconditioning steps are performed by a digital to
analog converter for offset and gain correction purposes with a subsequent signal amplification.
The output signals are ratiometric. In the ±4g acceleration range the sensor is offering a
sensitivity of 300mV/g at 3.0 V supply voltage (V
DD
/ 10) and 220µg/√Hz as a typical noise level.
The typical current consumption is 200µA in operation. Furthermore, the sensor can be
switched into a standby mode via supplementary selection pins. In standby mode the sensor
module features an ultra low current consumption of typically 0.7 µA. The return from standby
mode to full performance conditions is performed in less than 1ms wake up time.
The BMA140 sensor module is ready to use due to test and calibration at factory level. All
calibration parameters, e.g. for offset and sensitivity, are stored in an internal EEPROM. The
sensor also features full self-test capability for all three axes. It is activated via a single self test
activation pin which results in a physical deflection of the seismic mass in the sensing element
due to electrostatic forces. Thus, it provides contact and functional testing of the complete
signal evaluation path including the MEMS acceleration-sensing element and the evaluation
ASIC.
Rev. 1.1
Page 3
04 April 2008
© Bosch Sensortec GmbH reserves all rights even in the event of industrial property rights. We reserve all rights of disposal such
as 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.
BMA140
Data sheet
Triaxial, analog acceleration sensor
Bosch Sensortec
C
ONTENT
1
2
3
SPECIFICATION
ABSOLUTE MAXIMUM RATINGS
BMA140 FEATURES
3.1
3.2
4
G
ENERAL DESCRIPTION
C
HANNEL MULTIPLEXER
5
7
8
8
9
10
10
10
10
11
11
13
14
15
15
16
16
17
18
19
20
22
23
23
23
23
24
OPERATION
4.1
4.2
4.3
4.4
4.5
4.6
4.7
4.8
4.9
P
OWER
-
ON RESET AND POWER
-
UP SEQUENCE
O
PERATION MODE SELECTION
C
HANNEL MULTIPLEXER OUTPUT SELECTION
A
NALOG OUTPUT ON
A
X
, A
Y AND
A
Z
S
ELF TEST
P
OLARITY OF THE ACCELERATION OUTPUT
P
IN CONFIGURATION
(
TOP VIEW
)
C
ONNECTING DIAGRAM
H
ANDLING INSTRUCTIONS
5
PACKAGE
5.1
5.2
5.3
5.4
5.5
5.6
O
UTLINE DIMENSIONS
P
RINTED CIRCUIT BOARD
(PCB)
DESIGN
M
ARKING
M
OISTURE SENSITIVITY LEVEL AND SOLDERING
T
APE AND REEL
R
O
HS
COMPLIANCY
6
LEGAL DISCLAIMER
6.1
6.2
6.3
E
NGINEERING SAMPLES
P
RODUCT USE
A
PPLICATION EXAMPLES AND HINTS
7
DOCUMENT HISTORY AND MODIFICATION
Rev. 1.1
Page 4
04 April 2008
© Bosch Sensortec GmbH reserves all rights even in the event of industrial property rights. We reserve all rights of disposal such
as 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.
BMA140
Data sheet
Triaxial, analog acceleration sensor
Bosch Sensortec
1
Specification
If not stated otherwise, the given values are maximum values over lifetime and are valid for the
specified temperature and voltage ranges.
O
PERATING
R
ANGE
Parameter
Acceleration range
Supply voltage
Digital input
low level
Digital input
high level
Supply current in
normal mode
Supply current in
stand-by mode
Operating
temperature
Symbol
g
FS4g
V
DD
VIL
VIH
I
DD
I
DDsbm
T
A
for TEST, ST, SEL.0
and SEL.1
for TEST, ST, SEL.0
and SEL.1
analog and digital
analog and digital
full performance
-40
0.8 * V
DD
200
0.7
+85
290
Condition
±4g
1.8
Min
Typ
±
4
3.0
3.5
0.2 * V
DD
Max
Units
g
V
V
V
µA
µA
°C
O
UTPUT
S
IGNAL
Unless stated otherwise output signals are for operation at V
DD
= 3.0 V and T = 25ºC.
Parameter
Zero-g voltage
Symbol
Off
Condition
V
DD
= 3.0V
1.8V
≤
V
DD
≤
3.5V
Zero-g voltage
temperature drift
Sensitivity
Bandwidth
1
st
order filter
Nonlinearity
Self test response
Output noise
TCO
-40°C
≤
T
A
≤
+85°C
V
DD
= 3.0V
1.8V
≤
V
DD
≤
3.5V
f
-3dB
NL
TST
n
rms
with 1nF connected to
Ax, Ay, Az
best fit straight line
triggerable via ST pin
rms
0.288
-4%
Min
1.455
-150
Typ
1.500
0
V
DD
/ 2
±1
0.300
V
DD
/ 10
1.500
±0.5
0.65
220
0.312
+4%
kHz
%FS
g
µg
/
Hz
Max
1.545
+150
Units
V
mg
V
mg/K
S
V/g
Rev. 1.1
Page 5
04 April 2008
© Bosch Sensortec GmbH reserves all rights even in the event of industrial property rights. We reserve all rights of disposal such
as 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.
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