MXD2020ML datasheet(1/7 Pages) ETC | Improved, Ultra Low Noise Dual Axis Accelerometer with Digital Outputs

1 page

MEMSIC MXD2020GL/ML

Page 1 of 7

2002.08.29.1

Improved, Ultra Low Noise

±1 g

Dual Axis Accelerometer with

Digital Outputs

MXD2020GL/HL

MXD2020ML/NL

FEATURES

Resolution better than 1 milli-g

Dual axis accelerometer fabricated on a monolithic CMOS IC

On chip mixed mode signal processing

No moving parts

50,000 g shock survival rating

17 Hz bandwidth expandable to >160 Hz

3.0V to 5.25V single supply continuous operation

Continuous self test

Independent axis programmability (special order)

Compensated for Sensitivity over temperature

Ultra low initial Zero-g Offset

APPLICATIONS

Automotive – Vehicle Security/Vehicle stability control/

Headlight Angle Control/Tilt Sensing

Security – Gas Line/Elevator/Fatigue Sensing

Information Appliances – Computer Peripherals/PDA’s/Mouse

Smart Pens/Cell Phones

Internal

Oscillator

Sck

(optional)

CLK

Heater

Control

X axis

Y axis

Factory Adjust

Offset & Gain

LPF

Temperature

Sensor

Voltage

Reference

Vref

Dout X

Vdd

Vda

Gnd

2-AXIS

SENSOR

Dout Y

Tout

Continous

Self Test

A/D

MXD2020GL/HL/ML/NL FUNCTIONAL BLOCK

DIAGRAM

Gaming – Joystick/RF Interface/Menu Selection/Tilt Sensing

GPS

– electronic Compass tilt Correction

Consumer – LCD projectors, pedometers, blood pressure

Monitor, digital cameras

GENERAL DESCRIPTION

The MXD2020GL/HL/ML/NL is a low cost, dual axis

accelerometer fabricated on a standard, submicron CMOS

process. It is a complete sensing system with on-chip

mixed mode signal processing. The

MXD2020GL/HL/ML/NL measures acceleration with a

full-scale range of

±1 g and a sensitivity of 20%/g. It can

measure both dynamic acceleration (e.g. vibration) and

static acceleration (e.g. gravity).

The MXD2020GL/HL/ML/NL 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 of 50,000

g, leading to significantly lower failure rate and lower loss

due to handling during assembly.

The MXD2020GL/HL/ML/NL provides two digital outputs

that are set to 50% duty cycle at zero g acceleration. The

outputs are digital with duty cycles (ratio of pulse width to

period) that are proportional to acceleration. The duty

cycle outputs can be directly interfaced to a micro-

processor.

The typical noise floor is 0.2 mg/ Hz allowing signals

below 1 milli-g to be resolved at 1 Hz bandwidth. The

MXD2020GL/HL/ML/NL is packaged in a hermetically

sealed LCC surface mount package (5 mm x 5 mm x 2 mm

height) and is operational over a -40°C to 105°C(M/NL) and

°C to 70°C(G/HL) 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

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