mxr7250vw memsic, mxr7250vw Datasheet

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mxr7250vw

Manufacturer Part Number
mxr7250vw
Description
Low Cost ?5 G Dual-axis Accelerometer With Ratiometric Outputs
Manufacturer
memsic
Datasheet
FEATURES
Dual axis accelerometer fabricated on a single CMOS IC
Monolithic design with mixed mode signal processing
RoHS compliant
On-chip sensitivity compensation for temperature variations
On Demand Self Test
± 5g dynamic range, 250mV/g sensitivity
Independent axis programmability (special order)
Resolution better than 1mg
Zero-g Output Temperature drift, better than ±80mg over
–40~95degC range
27Hz bandwidth
>50,000 g shock survival rating
4.50V to 5.25V single supply operation
Small surface mount package, 5.5mm x 5.5mm x 2.7mm
APPLICATION
Automotive – Roll over sensing, VSC/EPB application
GENERAL DESCRIPTION
The MXR7250VW is a low cost, dual axis accelerometer
built on a standard, submicron CMOS process. It measures
acceleration with a full-scale range of ±5g and a sensitivity
of 250mV/g.
The MXR7250VW provides a g-proportional ratiometric
analog output above/below the zero-g point at 50% of the
supply voltage.
(Ref. other MEMSIC data sheets for absolute analog or
digital outputs).
The typical noise floor is 0.6mg / Hz , allowing signals
below 1mg to be resolved at 1Hz bandwidth. The 3dB roll-
off of the device occurs at 27Hz.
The MXR7250VW is packaged in a hermetically sealed
LCC surface mount package (5.5 mm x 5.5 mm x 2.7 mm
height), and the package can be used as both XY and XZ
sensing, its operation temperature is -40°C to +95°C.
Memsic’s accelerometer technology allows for designs
from ±1 g to ±70 g with custom versions available above
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 MXR7250VW Rev.C
Low Cost ±5 g Dual-Axis Accelerometer
with Ratiometric Outputs
Page 1 of 6
±70 g. It can measure both dynamic acceleration (e.g.,
vibration) and static acceleration (e.g., gravity).
The design is based on heat convection and requires no
solid proof mass. This eliminates stiction and particle
problems associated with competitive devices and provide
shock survival greater than 50,000 g, leading to
significantly lower failure rates and lower loss due to
handling during assembly and at customer field application.
Due to the standard CMOS structure of the MXR7250VW,
additional circuitry can easily be incorporated into custom
versions for high volume applications. Contact Memsic’s
local office for more information.
©MEMSIC, Inc.
One Technology Drive, Suite 325, Andover, MA01810, USA
Tel: +1 978 738 0900
www.memsic.com
Connection
MXR7250VW FUNCTIONAL BLOCK DIAGRAM
No
TP
CLK
Acceleration
Sensor
Heater
Control
CLK
Oscillator
Internal
Y axis
X axis
TEMP
MXR7250VW
Gain Adj.
Coarse
Gain Adj.
Coarse
CLK
CLK
Fax: +1 978 738 0196
VDD
GND
CLK TEMP CLK
CLKTEMP
Fine Gain
Fine Gain
Vref
Adj.
Temp
Comp.
Adj.
Temp
Comp.
A/D
A/D
CLK
Temperature
Sensor
TEMP
Vref
Vref
D/A
D/A
CLK
CLK
Low Pass
Low Pass
6/06/2008
Filter
Filter
CLK
CLK
Buf.
Buf.
Xout
Connection
Connection
Yout
No
No

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mxr7250vw Summary of contents

Page 1

... Small surface mount package, 5.5mm x 5.5mm x 2.7mm APPLICATION Automotive – Roll over sensing, VSC/EPB application GENERAL DESCRIPTION The MXR7250VW is a low cost, dual axis accelerometer built on a standard, submicron CMOS process. It measures acceleration with a full-scale range of ±5g and a sensitivity of 250mV/g. The MXR7250VW provides a g-proportional ratiometric analog output above/below the zero-g point at 50% of the supply voltage ...

Page 2

... Sensitivity has a linear scale over the supply range of 4.5 to 5.25 volts according to the ratio (Vdd/5.0 volts) x (250mV/g). recommended to filter with a minimum of 200Hz low pass filter. MEMSIC MXR7250VW Rev.C (Measurements @ 25°C, Acceleration = 0 g unless otherwise noted; V Conditions Each Axis ...

Page 3

... TOP VIEW Y=2.75V (Not to Scale) X=2.75V Y=2.50V EARTH’S SURFACE MEMSIC MXR7250VW Rev.C ESD Compliance: The MXR7250V sensor is in compliance with the following ESD standards: Human Body and 2500V per AEC-Q100-002 Rev. E Machine Model and 250V per AEC-Q100-003 Rev Sensing: +Y Note: Small circle indicates pin seven (7) ...

Page 4

... NC – No connect. These pins can be tied to common if the application does not allow pins to remain unconnected. COM – This is the ground pin for the MXR7250VW CLK – This is an optional serial clock input. The standard product is delivered with an internal clock (1000 kHz). ...

Page 5

... the sensitivity at any other final temperature T f the temperature values in ° the ratio between uncompensated sensitivity and compensated sensitivity at 25°C. . MEMSIC MXR7250VW Rev.C 2.8 X=1.60V Y=1.70V . TOP VIEW (Not to Scale) 95 °C X=1.80V Y=1.70V Note1: When the temperature compensation is disabled and self-test is enabled ...

Page 6

... PCB immediately surrounding the MEMSIC device and that there is no significant heat source nearby. This will minimize any errors in the measurement of acceleration. MEMSIC MXR7250VW Rev.C on the DD PACKAGE OUTLINE Dimensions shown in mm. CERAMIC ...

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