BMA145 Bosch Sensortec, BMA145 Datasheet - Page 15

• 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

4.8
The following external components (c
According to the following equation a customized cut-off frequency can be realized by a simple
dimension of C
to the x-axis but it is also representative for the y- and z-axis. The AMUX cut-off frequency
output behavior is directly linked up to C
capacitor on the multiplexer output pin.
4.9
Micromechanical sensors are designed to sense acceleration with high accuracy even at low
amplitudes and contain highly sensitive structures inside the sensor element. The MEMS sensor
can tolerate mechanical shocks up to several thousand g's. However, these limits might be
exceeded in conditions with extreme shock loads such as e.g. hammer blow on or next to the
sensor, dropping of the sensor onto hard surfaces etc.
We strongly recommend to avoid g-forces beyond the specified limits (see section 2) during
transport, handling and mounting of the sensors in a defined and qualified installation process.
This device has built-in protections against high electrostatic discharges or electric fields (e.g.
2kV HBM); however, anti-static precautions should be taken as for any other CMOS component.
Unless otherwise specified, proper operation can only occur when all terminal voltages are kept
within the supply voltage range. Unused inputs must always be tied to a defined logic voltage
level.
Please refer to the separately available document “Handling, soldering & mounting instructions”
for the BMA145.
Rev. 1.1
© 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.
Connecting diagram
Handling instruction
x
(C
y
C
, C
x
z
) to create a RC low pass filter. The below given equation corresponds
Triaxial, analog acceleration sensor
33 kΩ
33 kΩ
33 kΩ
f
c
_
x
1
AX
AY
AZ
AMUX
=
and c
2
π
Data sheet
Page 15
x ,
BMA145
⋅
2
33
V
V
GND
) are recommended to decouple the power source.
C
DDA
DDD
1
k
y
Ω
& C
⋅
c
x
z .
100nF
C
Do not connect an additional external
1
3.0 V
10nF
C
2
Bosch Sensortec
02 April 2008