mxd2020e memsic, mxd2020e Datasheet

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mxd2020e

Manufacturer Part Number
mxd2020e
Description
Ultra Low Noise, Low Offset Drift ?1 G Dual Axis Accelerometer With Digital Outputs
Manufacturer
memsic
Datasheet

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Part Number
Manufacturer
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Part Number:
mxd2020eL
Manufacturer:
VTI
Quantity:
1 770
Part Number:
mxd2020eL
Manufacturer:
MEMSIC
Quantity:
20 000
FEATURES
Resolution better than 1 mg at 1 Hz
Dual axis accelerometer fabricated on a monolithic CMOS IC
RoHS compliant
On-chip mixed mode signal processing
50,000 g shock survival rating
17 Hz bandwidth
3.00V to 5.25V single supply operation
Small (5mm x 5mm x 2mm) surface mount package
Continuous self-test
Independent axis programmability (special order)
APPLICATIONS
Automotive – Vehicle Security/Active Suspension/ABS
Security – Gas Line/Elevator/Fatigue Sensing
Office Equipment – Computer Peripherals/PDA’s/Cell Phones
Gaming – Joystick/RF Interface/Menu Selection/Tilt Sensing
Projectors - Leveling and Keystoning
White Goods – Spin/Vibration Control
GENERAL DESCRIPTION
The MXD2020E/F is an ultra low noise and low cost, dual
axis accelerometer built on a standard, submicron CMOS
process. The MXD2020E/F measures acceleration with a
full-scale range of ± 1 g and a sensitivity of 20%/g @5V at
25
vibration) and static acceleration (e.g., gravity). The
MXD2020E/F 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 up to 50,000 g, leading to
significantly lower failure rates and lower losses due to
handling during assembly.
The MXD2020E/F provides two digital outputs. The
outputs are digital signals with duty cycles (ratio of pulse
width to period) that are proportional to acceleration. The
duty cycles outputs can be directly interfaced to a micro-
processor.
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 MXD2020E/F Rev H
°C
Headlight Angle Control/Tilt Sensing
. It can measure both dynamic acceleration (e.g.,
Ultra Low Noise, Low offset Drift ±1 g Dual
Page 1 of 8
Axis Accelerometer with Digital Outputs
below 1mg to be resolved at 1 Hz bandwidth. The
MXD2020E/F is available in a LCC surface mount package
(5mm x 5mm x 2mm height). It is hermetically sealed and
operational over a -40°C to +105°C temperature range.
Due to the standard CMOS structure of the MXD2020E/F,
additional circuitry can easily be incorporated into custom
versions for high volume applications. Contact the factory
for more information.
The typical noise floor is 0.2mg / Hz allowing signals
©MEMSIC, Inc.
800 Turnpike St., Suite 202, North Andover, MA01845, USA
Tel: +1 978 738 0900
www.memsic.com
(optional)
MXD2020E/F FUNCTIONAL BLOCK DIAGRAM
Sck
CLK
SENSOR
Control
2-AXIS
Heater
V
Oscillator
Internal
DD
Y axis
X axis
MXD2020E/F
Factory Adjust
Offset & Gain
Fax: + 978 738 0196
Continous
Self Test
Gnd
Low Pass
Low Pass
Filter
Filter
Temperature
V
Reference
DA
Voltage
Sensor
2/26/2007
T
V
D
D
OUT
REF
OUTX
OUTY

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mxd2020e Summary of contents

Page 1

... Projectors - Leveling and Keystoning White Goods – Spin/Vibration Control GENERAL DESCRIPTION The MXD2020E ultra low noise and low cost, dual axis accelerometer built on a standard, submicron CMOS process. The MXD2020E/F measures acceleration with a full-scale range of ± and a sensitivity of 20%/g @ ° ...

Page 2

... Please refer to the section in this data sheet titled “Compensation for the Change of Sensitivity over Temperature” for more information. MEMSIC MXD2020E/F Rev H (Measurements @ 25°C, Acceleration = 0g unless otherwise noted, V Conditions Each Axis ...

Page 3

... Reference Output ref 7 Sck Optional External Clock 8 V Digital Supply Voltage DD MEMSIC MXD2020E/F Rev H Device Weight < 1 gram THEORY OF OPERATION Digital The MEMSIC device is a complete dual-axis acceleration Output measurement system fabricated on a monolithic CMOS IC 100 Hz process. The device operation is based on heat transfer by ...

Page 4

... And 1.6MHz – This pin is the output of a reference voltage set V ref at 2.50V typical and has 100μA of drive capability. MEMSIC MXD2020E/F Rev H COMPENSATION FOR THE CHANGE IN SENSITIVITY OVER TEMPERATURE All thermal accelerometers display the same sensitivity . The DC voltage change with temperature. The sensitivity change depends on variations in heat transfer that are governed by the laws of physics ...

Page 5

... Acquisition Time : the duration of the measurement of the acceleration signal Y-Axis Change DUTY CYCLE DEFINITION Y Output per deg. The MXD2020E/F has two PWM duty cycle outputs (x,y tilt The acceleration is proportional to the ratio T1/T2. The ( zero g output is set to 50% duty cycle and the sensitivity 0.000 17 ...

Page 6

... In many cases a computer is used to control the temperature, communicate with the MCU, and to calculate the constants. After calculating the constants, the computer downloads the constants to EEPROM. MEMSIC MXD2020E/F Rev H For a more detail discussion of temperature compensation reference MEMSIC application note #AN-00MX-002 Figure 4: Zero g Offset Temperature Compensation Circuit ...

Page 7

... The capacitor lead length should be as short as DD possible, and surface mount capacitor is preferred. For typical applications, the capacitor can be ceramic 0.1 μF. MEMSIC MXD2020E/F Rev H Power Supply C1 0.1uF Figure 7: Power Supply Noise Rejection PCB LAYOUT AND FABRICATION SUGGESTIONS 1 ...

Page 8

... MEMSIC MXD2020E/F Rev H PACKAGE DRAWING Fig 8: Hermetically Sealed Package Outline Page 2/26/2007 ...

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