BMA140 Bosch Sensortec, BMA140 Datasheet - Page 2

• Manufacturer Part Number: BMA140
• Description: 3-AXIS ACCELEROMETER ANALOG I/F
• Manufacturer: Bosch Sensortec

Specifications of BMA140

• Axis: X, Y, Z
• Acceleration Range: ±4g
• Sensitivity: 300mV/g
• Voltage - Supply: 1.8 V ~ 3.5 V
• Output Type: Analog
• Bandwidth: 1.5kHz
• Interface: Parallel
• Mounting Type: Surface Mount
• Package / Case: 12-LGA
• For Use With: DM240021 - KIT STARTER MPLAB FOR PIC24H828-1010 - BMA140 DAUGHTERCARD FOR DEV KIT
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 828-1001-2

Sensor operation
The BMA140 provides three parallel analog output
sig nals in a ±4g acceleration range. All acceleration
signals are permanently available on three indepen-
dent analog pads through 33kΩ resistors on each pad.
For each axis, an independent analog 1.5kHz
1
conditioning of the measured acceleration signal.
Specification subject to change without notice
© Bosch Sensortec GmbH reserves all rights in the event of industrial property rights. We reserve all rights of disposal such as copying and passing on
st
2
Package and pin configuration
Pin No.
-order low-pass filter is included to provide pre-
to third parties. BOSCH and the symbols are registered trademarks of Robert Bosch GmbH, Germany.
Pin 1
identifier
11
12
10
1
2
3
4
5
6
7
8
9
SEL.0
Bosch Sensortec
Name
V
V
GND 1
GND 2
ST
SEL.1
TEST
AZ
AY
AX
AMUX
SEL.0
DD1
DD2
AMUX
V
11
DD1
1
12
(pads not visible)
X out Y out Z out
V
10
2
DD2
Function
Supply voltage
Supply voltage
Ground connection
Ground connection
Self test activation
Multiplexer selection
Do not connect
Z acceleration output
Y acceleration output
X acceleration output
Multiplex serial output
Multiplexer selection
top view
GND1 GND2
BMA140
9
3
8
4
6
TEST
ST
5
7
SEL.1
The BMA140 also features full self-test capability for
all three axes. It provides full testing of the complete
signal evaluation path including the MEMS accelera-
tionsensing element and the evaluation ASIC.
In combination with the integrated 33kΩ resistors,
the corner frequency of this filter can easily be
customized by the use of external capacitors.
Additional signal preconditioning steps are per-
formed by a digital-to-analog converter for offset
and gain correction purposes with a subsequent
signal amplification. All output signals are fully
ratio-metric.
With an acceleration range of ±4g the BMA140 provi-
des a sensitivity of 300mV/g at 3.0V supply voltage
(VDD/10) and 220µg/√Hz as a typical RMS noise
level. The typical current consumption is only 200µA
in normal operation mode.
In addition to the parallel X, Y and Z output signals
there is the option to multiplex any axis to one single
supplementary output pin in a freely customized
manner, thus requiring only one A/D channel.
Furthermore, the BMA140 can be switched into
stand-by mode via supplementary selection pins. In
this mode the sensor module features an ultra-low
current consumption of only 0.9µA at maximum. The
return from stand-by mode to normal mode takes
less than 1 millisecond wake up time.
The BMA140 is ready to use due to test and calibra-
tion at factory level. All calibration parameters, e.g.
for offset and sensitivity, are stored in an internal
EEPROM.
Headquarters
Bosch Sensortec GmbH
Gerhard-Kindler-Strasse 8
72770 Reutlingen · Germany
Telephone [phone]
Fax [phone]
[e-mail]
www.bosch-sensortec.com
Version_1.0_022008