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PDF MXA6500E Data sheet ( Hoja de datos )
| Número de pieza | MXA6500E | |
| Descripción | Dual Axis Accelerometer | |
| Fabricantes | Memsic | |
| Logotipo |  |
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Low Profile, Low Consumption
±0.5 g Dual Axis Accelerometer with
Absolute Analog Outputs
MXA6500E
FEATURES
Low power consumption: typical 2mA@3V
Resolution better than 1 milli-g
Dual axis accelerometer fabricated on a monolithic
CMOS IC
On chip mixed signal processing
No moving parts
No loose particle issues
>50,000 g shock survival rating
5mm X 5mm X 1.55mm LCC package
2.7V to 3.6V single supply continuous operation
Ultra low initial Zero-g Offset
No adjustment needed outside
APPLICATIONS
Tilt and motion sensing in cost-sensitive applications
Smart handheld devices
Computer security
Input devices
Pedometers and activity monitors
Gaming controllers
Toys and entertainment products
GENERAL DESCRIPTION
The MXA6500E is a low cost; dual axis accelerometer
fabricated on a standard, submicron CMOS process. It is a
complete sensing system with on-chip mixed signal
processing. The MXA6500E measures acceleration with a
full-scale range of ±0.5 g and a sensitivity of 500mV/g @3V
at 25°C. It can measure both dynamic acceleration (e.g.
vibration) and static acceleration (e.g. gravity). The
MXA6500E design is based on heat convection and requires
no solid proof mass. This eliminates stiction and particle
problems associated with competitive devices and provides
shock survival greater than 50,000 g, leading to significantly
lower failure rate and lower loss due to handling during
assembly and at customer field application.
TEMP
VDD
TP
Internal
Oscillator
VREF
CLK CLK
PD
Heater
Control
Coarse Fine Gain
Gain Adj. Adj.
Temperature
Sensor
TEMP
Vref
No
Connection
X aixs
Temp
Comp.
A/D
D/A
Low Pass
Filter
Buf.
CLK CLK TEMP CLK
Coarse Fine Gain
Gain Adj. Adj.
CLK
Vref
CLK
Xout
No
Connection
Y aixs
Acceleration
Sensor
Temp
Comp.
A/D
D/A
Low Pass
Filter
Buf.
CLK CLKTEMP CLK CLK CLK
GND
Yout
MXA6500E FUNCTIONAL BLOCK DIAGRAM
The max noise floor is 1 mg/ Hz allowing signals below
1 milli-g to be resolved at 1 Hz bandwidth. The
MXA6500E is packaged in a hermetically sealed lowprofile
LCC surface mount package (5 mm x 5 mm x 1.55 mm
height). It is operational over a -40°C to +85°C temperature
range.
Information furnished by MEMSIC is believed to be accurate and reliable. However,
no responsibility is assumed by MEMSIC for its use, nor for any infringements of
patents or other rights of third parties which may result from its use. No license is
granted by implication or otherwise under any patent or patent rights of MEMSIC.
©MEMSIC, Inc.
800 Turnpike St., Suite 202, North Andover, MA 01845
Tel: 978.738.0900
Fax: 978.738.0196
www.memsic.com
MEMSIC MXA6500E Rev.B
Page 1 of 6
3/22/2005
www.DataSheet.in
1 page  
sensing to be achieved with the MEMSIC device (reference
application note AN-00MX-007).
POWER SUPPLY NOISE REJECTION
One capacitor is recommended for best rejection of power
supply noise (reference figure below). The capacitor should
be located as close as possible to the device supply pin
(VDD). The capacitor lead length should be as short as
possible, and surface mount capacitor is preferred. For
typical applications, the capacitor can be ceramic 0.1 µF.
Accelerometer Position Relative to Gravity
X-Axis
Orientation
To Earth’s
Surface
(deg.)
90
85
80
70
60
45
30
20
10
5
0
X-Axis
Y-Axis
Change
X Output per deg. Y Output
(g) of tilt (g)
(mg)
1.000
0.15 0.000
0.996
1.37 0.087
0.985
2.88 0.174
0.940
5.86 0.342
0.866
8.59 0.500
0.707
12.23
0.707
0.500
15.04
0.866
0.342
16.35
0.940
0.174
17.16
0.985
0.087
17.37
0.996
0.000
17.45
1.000
Changes in Tilt for X- and Y-Axes
Change
per deg.
of tilt
(mg)
17.45
17.37
17.16
16.35
15.04
12.23
8.59
5.86
2.88
1.37
0.15
Resolution: The accelerometer resolution is limited by
noise. The output noise will vary with the measurement
bandwidth. With the reduction of the bandwidth, by
applying an external low pass filter, the output noise drops.
Reduction of bandwidth will improve the signal to noise
ratio and the resolution. The output noise scales directly
with the square root of the measurement bandwidth. The
maximum amplitude of the noise, its peak- to- peak value,
approximately defines the worst case resolution of the
measurement. With a simple RC low pass filter, the rms
noise is calculated as follows:
Noise (mg rms) = Noise(mg/ Hz ) * (Bandwidth(Hz) *1.6)
The peak-to-peak noise is approximately equal to 6.6 times
the rms value (for an average uncertainty of 0.1%).
Power Supply Noise Rejection
PCB LAYOUT AND FABRICATION SUGGESTIONS
1. It is best to solder a 0.1uF capacitor directly across VDD
and COM pin.
2. Robust low inductance ground wiring should be used.
3. Care should be taken to ensure there is “thermal
symmetry” on the PCB immediately surrounding the
MEMSIC device and that there is no significant heat
source nearby.
4. A metal ground plane should be added directly beneath
the MEMSIC device. The size of the plane should be
similar to the MEMSIC device’s footprint and be as
thick as possible.
5. Vias can be added symmetrically around the ground
plane. Vias increase thermal isolation of the device
from the rest of the PCB.
MEMSIC MXA6500E Rev.B
www.DataSheet.in
Page 5 of 6
3/22/2005
5 Page | ||
| Páginas | Total 6 Páginas | |
| PDF Descargar | [ Datasheet MXA6500E.PDF ] | |
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