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MXD2020EL Datasheet(PDF) 3 Page - List of Unclassifed Manufacturers

Part No. MXD2020EL
Description  Ultra Low Noise, Low offset Drift 1g, -1g Dual Axis Accelerometer with Digital Outputs
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Maker  ETC1 [List of Unclassifed Manufacturers]
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MXD2020EL Datasheet(HTML) 3 Page - List of Unclassifed Manufacturers

   
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MEMSIC MXD2020E/FL Rev D
Page 3 of 8
11/14/2003
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
θJA
θJC
Device Weight
LCC-8
110
°C/W
22
°C//W
< 1 gram
Ordering Guide
Model
Package Style
Digital
Output
D2020EL
LCC-8 SMD*
100 Hz
D2020FL
LCC-8 SMD*
400 Hz
*LCC parts are shipped in tape and reel packaging.
Caution
ESD (electrostatic discharge) sensitive device.
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.
Small circle indicates pin one(1).
Pin Description: LCC-8 Package
Pin
Name
Description
1
TOUT
Temperature (Analog Voltage)
2
DOUTY
Y-Axis Acceleration Digital Signal
3
Gnd
Ground
4
VDA
Analog Supply Voltage
5
DOUTX
X-Axis Acceleration Digital Signal
6
Vref
2.5V Reference
7
Sck
Optional External Clock
8
VDD
Digital Supply Voltage
8
4
1
2
3
7
6
5
Top View
X +g
Y +g
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. The stationary element, or ‘proof
mass’, in the MEMSIC sensor is a gas.
A single heat source, centered in the silicon chip is
suspended across a cavity. Equally spaced
aluminum/polysilicon 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. Please visit the MEMSIC
website at www.memsic.com for a picture/graphic
description of the free convection heat transfer principle.
PIN DESCRIPTIONS
VDD – This is the supply input for the digital circuits and
the sensor heater in the accelerometer. The DC voltage
should be between 3.00 and 5.25 volts. Refer to the section
on PCB layout and fabrication suggestions for guidance on
external parts and connections recommended.
VDA – This is the power supply input for the analog
amplifiers in the accelerometer. Refer to the section on PCB
layout and fabrication suggestions for guidance on external
parts and connections recommended.
Gnd – This is the ground pin for the accelerometer.
DOUTX – This pin is the digital output of the x-axis
acceleration sensor. It is factory programmable to 100 Hz


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