BMA145 Bosch Sensortec, BMA145 Datasheet - Page 2

• Manufacturer Part Number: BMA145
• Description: 3-AXIS ACCELEROMETER ANALOG I/F
• Manufacturer: Bosch Sensortec

Specifications of BMA145

• 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: 16-LGA
• For Use With: 828-1011 - BMA145 DAUGHTERCARD FOR DEV KIT
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 828-1002-2

Sensor operation
The BMA145 provides three parallel analog output
signals in a ±4g acceleration range. All acceleration
signals are permanently available on three indepen-
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
2
Package and pin configuration
Pin 1
identifier
Pin No.
to third parties. BOSCH and the symbols are registered trademarks of Robert Bosch GmbH, Germany.
SEL.0
11
12
13
14
15
10
16
TEST
GND
1
2
3
4
5
6
7
8
9
ST
Bosch Sensortec
Name
TEST
ST
GND
SEL.0
GND
GND
GND
Z
A
Y
SEL.1
X
NC
V
V
NC
OUT
OUT
OUT
DD2
DD1
MUX
1
2
3
4
NC
GND
16
5
(pads not visible)
V
GND GND
15
top view
6
DD1
Function
Do not connect
Self-test activation
Ground connection
Multiplexer selection
Ground connection
Ground connection
Ground connection
Z acceleration output
Multiplex serial output
Y acceleration output
Multiplexer selection
X acceleration output
Not connected
Supply voltage
Supply voltage
Not connected
BMA145
V
14
7
DD2
NC
Z
13
8
OUT
12
11
10
9
SEL.1
A
X
Y
MUX
OUT
OUT
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 BMA145 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 BMA145 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.
The BMA145 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.
dent analog pads through 33kΩ resistors on each pad.
For each axis, an independent analog 1.5kHz
1
conditioning of the measured acceleration signal. In
combination with the integrated 33kΩ resistors, the
corner frequency of this filter can easily be custo-
mized by the use of external capacitors. Additional
signal preconditioning steps are performed by a digi-
tal-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 BMA145 provi-
des a sensitivity of 300mV/g at 3.0V supply voltage
(VDD/10) and 220µg/√Hz as a typical RMS noise
st
-order low-pass filter is included to provide pre-
Headquarters
Bosch Sensortec GmbH
Gerhard-Kindler-Strasse 8
72770 Reutlingen · Germany
Telephone [phone]
Fax [phone]
[e-mail]
www.bosch-sensortec.com
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