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MXA2500J Datasheet(PDF) 3 Page - List of Unclassifed Manufacturers

Part No. MXA2500J
Description  Ultra Low Cost, ±1.0 g Dual Axis Accelerometer with Absolute Outputs
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Maker  ETC1 [List of Unclassifed Manufacturers]
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MXA2500J Datasheet(HTML) 3 Page - List of Unclassifed Manufacturers

   
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MEMSIC MXA2500J/K Rev.A
Page 3 of 8
2/17/2006
ABSOLUTE MAXIMUM RATINGS*
Supply Voltage (VDD, VDA)
………………...-0.5 to
+7.0V
Storage Temperature …….………… -65
°C to +150°C
Acceleration ……………………………………..50,000
g
*Stresses above those listed under Absolute Maximum Ratings may cause
permanent damage to the device. This is a stress rating only; the functional
operation of the device at these or any other conditions above those
indicated in the operational sections of this specification is not implied.
Exposure to absolute maximum rating conditions for extended periods may
affect device reliability.
Package Characteristics
Package
θ
JA
θ
JC
Device Weight
LCC8
110
°C/W
22
°C/W
< 1 gram
Ordering Guide
Model
Temperature
Range
Package Style
MXA2500JV
0~70°C
LCC8,
RoHS compliant
MXA2500KV
-40~85°C
LCC8,
RoHS compliant
*LCC parts are shipped in tape and reel packaging.
Caution
ESD (electrostatic discharge) sensitive device.
8
4
1
2
3
7
6
5
Top View
X +g
Y +g
Note: The MEMSIC logo’s arrow indicates the +X sensing
direction of the device. The +Y sensing direction is rotated
90° away from the +X direction.
Pin Description: LCC8 Package
Pin
Name
Description
1
TOUT
Temperature (Analog Voltage)
2
AOUTY
Y-Axis Acceleration Signal
3
Gnd
Ground
4
VDA
Analog Supply Voltage
5
AOUTX
X-Axis Acceleration Signal
6
Vref
2.5V Reference
7
Sck
Connect to Ground
8
VDD
Digital Supply Voltage
THEORY OF OPERATION
The MEMSIC device is a complete dual-axis
acceleration measurement system fabricated on a
monolithic CMOS IC process. The device operation is
based on heat transfer by natural convection and
operates like other accelerometers having a proof
mass except it is a gas in the MEMSIC sensor.
A single heat source, centered in the silicon chip is
suspended across a cavity. Equally spaced
aluminum/poly-silicon thermopiles (groups of
thermocouples) are located equidistantly on all four
sides of the heat source (dual axis). Under zero
acceleration, a temperature gradient is symmetrical
about the heat source, so that the temperature is the
same at all four thermopiles, causing them to output
the same voltage.
Acceleration in any direction will disturb the
temperature profile, due to free convection heat
transfer, causing it to be asymmetrical. The
temperature, and hence voltage output of the four
thermopiles will then be different. The differential
voltage at the thermopile outputs is directly
proportional to the acceleration. There are two
identical acceleration signal paths on the
accelerometer, one to measure acceleration in the x-
axis and one to measure acceleration in the y-axis.


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