BMA145-0330SB010A BOSCH, BMA145-0330SB010A Datasheet - Page 12

• Manufacturer Part Number: BMA145-0330SB010A
• Description: Daughter Board
• Manufacturer: BOSCH

Specifications of BMA145-0330SB010A

• Silicon Manufacturer: Bosch
• Application Sub Type: Accelerometer - Three-Axis
• Kit Application Type: Sensing - Motion / Vibration / Shock
• Silicon Core Number: BMA145
• Kit Contents: Board

IMPORTANT NOTE: If the features described in 4.2 and 4.3 will not be used, SEL.0 and SEL.1
must be tied to GND. In all other cases, SEL.0 and SEL.1 transitions must be synchronous
within a 20ns tolerance to avoid the ASIC to switch to an unwanted state at transitions (valid for
the four possible transitions where the two signals SEL.0 and SEL.1 have to change
simultaneously). See also the figure given below.
4.4
By selecting the operation mode to “Normal” all 3 axis provide acceleration measurement
signals simultaneously on the Ax, Ay and Az pins according to the following equation.
Ax, Ay and Az are the vector components of the acting acceleration. According to chapter 1 the
sensitivity in the ±4g range corresponds to VDD/10 given in V/g. This means, the maximal
default acceleration range is ±4g.
4.5
The sensor features an on-chip self-test which can be activated by using the corresponding self
test input pin. The self test is realized by a physical deflection of the seismic mass due to an
electrostatic force. Thus, it provides contact and functional testing of the complete signal
evaluation path including the MEMS acceleration-sensing element and the evaluation ASIC.
The self test is activated by setting the self test activation input pin to logic 1. The test acts on all
three channels simultaneously. The typical change in output will be a static offset of
approximately +0.7g for x-, y- and for x-axis (nominal value). For the ±4g acceleration range this
corresponds to a nominal output signal delta of ∆Uout
Rev. 1.2
© 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. Document is not intended for publication.
A
X
=
Analog output on Ax, Ay and Az
Self test
⎛
⎜
⎝
V
2
DD
+
S
⋅
a
X
⎞
⎟
⎠
Triaxial, analog acceleration sensor
Page 12 / proprietary information
A
Y
=
⎛
⎜
⎝
V
DD
2
Data sheet
BMA145
+
S
⋅
a
Y
⎞
⎟
⎠
nom
[v] = (Vdd [v] / 10) x 0.7, to be added
A
Z
=
⎛
⎜
⎝
V
2
DD
+
06 February 2009
Bosch Sensortec
S
⋅
a
Z
⎞
⎟
⎠