Datasheet MX205QL, MX205QC Datasheet (MEMSIC)

The MX205Q is a very low cost dual-axis acceleration sensor on a monolithic IC. With no moving
parts, the device is extremely reliable and is manufactured on a submicron CMOS process
enabling small geometries and small die size, resulting in low overall cost and high functionality.
The MX205Q is primarily designed for applications requiring high performance and where overall
system cost is a driving factor in component selection. The MX205Q measures acceleration with
a full-scale range of up to ± 5.0

g and produces an Analog signal output. The X,Y accelerometer

outputs are scaled proportionately to the VDD, VDA supply voltage with the scale of 44%. Typical
noise floor is 750 µg/√Hz rms, allowing signals below 1 .0 milli-g to be resolved in 1 Hz bandwidth.
Frequency response extends to 40 Hz. The frequency response can be extended to 160 Hz with
the implementation of a simple external circuit. See Application Note (AN-00MX-003).

The MX205Q is a dc accelerometer with the capability to measure both ac accelera­tion, (typical of vibration) or dc accelerations, (such as inertial force or constant, gravity-induced
accelerations).

The MX205Q offers a calibrated temperature sensor output with a positive temperature
coefficient of 5.0 mV/°C. This device can be temperature compensated easily. The change in
sensitivity over the temperature range –40°C to 125°C is predictable and follows the physical gas
laws. The following equation can be used to predict the sensitivity at any given temperature: SINX

(T

IN

)

2.67

= S

FIN

X (T

FIN

)

2.67

Temperature in °K See Application Note (AN-00MX-002).

The MX205Q is available in a metal can (TO-100) or an LCC surface mount device;both
are hermetically sealed and are operational over the temperature range -40°C to 125°C.

General Description

MX205Q (RATIOMETRIC)

Features

Low Cost, 5.0g, Dual Axis Accelerometer
with Analog Outputs

• Dual axis acceleration outputs

• Analog outputs, ratiometric

• 1.0 mg Resolution in 1Hz bandwidth

• 40 Hz Bandwidth expandable to 160 Hz

See Application Note (AN-00MX-003)

• Quiescent Supply Voltage: 3.5 mA

• 0g output voltage 2.315V (with 5V supply)

• 50,000g shock survival

• 2.70V to 5.25V Single Supply

• On-chip mixed signal processing

• Continuous sensors self test

• Temperature sensor output (Tout) 5mV/°K

• Packaged in 8 pin LCC SMD or

10 pin TO-100 THRU-HOLE

• Hermetically sealed packaging

• Reference voltage (V

REF

) 2.50V

Applications

• Automotive - Vehicle Security/Active Suspension/ABS/HED Angle Control

• Security - Gas Line/Elevator/Fatigue Sensing

• Office Automation Equipment - Computer Peripherals/Disk Drives/PDA’s/Mouse

Smart Pens/Cell Phones/Printer Head Acceleration Sensor

• Gaming - Joystick/RF Interface/Menu Selection

• White Goods - Spin/Vibration Control

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
implications or otherwise under any patent or patent
rights of MEMSIC.

Technical information.
Subject to change without notice.

®MEMSIC, Inc. 2000.
100 Burtt Road, Andover, MA 01810
Tel: [phone] • Fax: [phone]
www.memsic.com

MX205Q ANALOG Data Sheet M 8/1/01

Page 1 of 8

Data Sheet

MX205Q

Block Diagram of MX20XX

MX205Q SPECIFICATIONS
Analog Electrical Characteristics

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
implications or otherwise under any patent or patent
rights of MEMSIC.

Technical information.
Subject to change without notice.

Page 2 of 8

Data Sheet

®MEMSIC, Inc. 2000.
100 Burtt Road, Andover, MA 01810
Tel: [phone] • Fax: [phone]
www.memsic.com

MX205Q

MX205Q ANALOG Data Sheet N 8/1/01

NOTES

1

Guarantee by measurements of initial offset
and sensitivity.

2

Alignment error is specified as the angle between
the true and indicated axis of sensitivity.

3

Cross-axis sensitivity is the algebraic sum of the
alignment and the inherent sensitivity errors.

4

Specification refers to the maximum change in
parameter from its initial value at 25°C to its
worst case value at Tmin to Tmax of the specified
temperature range.

5

Noise density (µg/√Hz rms) is the average noise at any
frequency in the bandwidth of the device.

6

The voltage is required to ramp full scale before
making a measurement.

7

Note: Frequency compensating circuit will achieve
160 Hz operations. See Application Note (AN-00MX-002) .
Application boards available.

8

Defined as the output change from ambient to
maximum temperature or minimum. For more
details refer to Application Note (AN-00MX-002).

9

For more details refer to Application Note
(AN-00MX-001).

10

Operating at maximum current drive capabilities,

shifting of baseline sensitivity may occur.

11

Ratiometric analog output voltage will be 44.0%

of VDD, VDA supply.

All min and max specifications are subject to change
without notification.

Temperature Changes

8

Delta from 25°C per formula

S

IN

X (TIN)

2.67

= S

FIN

X (T

FIN

)

2.67

SENSOR Each axis
Measurement Range

1

Nonlinearity Best Fit Straight
Alignment Error

2

Line

SENSITIVITY Each axis
ANALOG OUTPUTS

Sensitivity

ZERO g BIAS LEVEL

11

Each axis 2.0 2.2 2.4 V

0g Offset vs. 2.0 mg/°C
Temperature

4

NOISE PERFORMANCE
Noise Density

5

@ +25°C 750 1000 µg/√Hz rms

in 40 Hz Bandwidth

FREQUENCY RESPONSE
3 dB Bandwidth 40 Hz
3 dB Bandwidth

7

160 Hz

SELF TEST
Voltage Delta at outputs Continuous,
@5V Supply Output rails with 5.0 V
@2.7V Supply failure 2.7 V

X, Y OUTPUTS

10

Current drive
capabilities, -2.5 +2.5 mA
source/sink

TEMPERATURE RANGE
Operating Range

Tout Voltage 25°C 1.23 1.25 1.27 V
Temp sensor sensitivity 5 mV/°K

V REFERENCE

9

25°C 2.4 2.5 2.6 V

+/- 5.0

2%

+/- 1.0 +/- 2.5

90 100 110

mV/g

g
% of FS
degrees

Min Typ Max

Parameter Conditions

MEMSIC MX205Q Units

2.7 5.25 V

3.0 3.5 mA

4.0 4.5 mA
200 400 ms

-40 125 °C

POWER SUPPLY
Operating Voltage Range
Specified Performance
Quiescent Supply Current @ 5V
Quiescent Supply Current @ 2.7V
Turn-On Time

6

Measurements @ 25°C Acceleration = 0g unless otherwise noted
VDD, VDA = 5.0V unless otherwise specified

Cross-Axis Sensitivity

3

X sensor to Y sensor +/- 2 %

Data Sheet

ORDERING GUIDE

Model Package Style

MX205QC TO-100 Metal Can
MX205QL LCC-8 SMD

*

PACKAGE CHARACTERISTICS

Package ThetaJA ThetaJC Device Weight

TO-100 150°C/W 25°C/W 0.04 oz
LCC-8 110°C/W 22°C/W 0.02 oz

Page 3 of 8

®MEMSIC, Inc. 2000.
100 Burtt Road, Andover, MA 01810
Tel: [phone] • Fax: [phone]
www.memsic.com

MX205Q

MX205Q ANALOG Data Sheet N 8/1/01

TO-100

LCC-8

TO-100

TOP

VIEW

TOP

VIEW

+g

+g

+g

+g

X

X

Y

Y

Axes of Sensitivity

LCC-8

Axes of Sensitivity

NOTE

Drops onto hard surfaces can cause shocks of greater than 50,000g
and exceed the absolute maximum rating of the device.
Care should be exercised in handling to avoid damage.

CAUTION

ESD (electrostatic discharge) sensitive device.

*Stresses above those listed under "Absolute Maximum Ratings" may cause permanent damage
to the device. These are stress ratings only; the functional operation of this 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.

ABSOLUTE MAXIMUM RATINGS*

Symbol Parameter Rating Units

VDD Supply Voltage to Ground Potential -0.5 to 7.0 Volts

T

STG

Storage Temperature -65 to +150 Deg C

Acceleration 50,000 g

*

LCC parts are shipped in tape and reel packaging.

MX205Q ANALOG Data Sheet N 8/1/01

1

2

3

6

7

8

9

10

5

4

Page 4 of 8

Data Sheet

Pin Function Descriptions
TOP-100 and LCC-8

PIN DESCRIPTION: TO-100 Package

Pin Name Description

1 VDD Digital Supply Voltage
2 TOUT Temperature
3 AOUTY Acceleration Signal
4 GND Ground
5 n/c no connection
6 VDA Analog Supply Voltage
7 AOUTX Acceleration Signal
8 VREF 2.50V Reference Voltage
9 SCK Serial Clock

10 RBias no connection

PIN DESCRIPTION: LCC-8 Package

Pin Name Description

1 TOUT Temperature
2 AOUTY Acceleration Signal
3 GND Ground
4 VDA Analog Supply Voltage
5 AOUTX Acceleration Signal
6 VREF 2.50V Reference Voltage
7 SCK Serial Clock
8 VDD Digital Supply Voltage

Top View

Top View

®MEMSIC, Inc. 2000.
100 Burtt Road, Andover, MA 01810
Tel: [phone] • Fax: [phone]
www.memsic.com

MX205Q

Optional external clock factory programmed
per customer request

*

*

*

Page 5 of 8

Data Sheet

Pin Definition

VDD - This is the digital power supply input for the MX20XX. The DC voltage should be between 2.70 and

5.25 volts.

VDA - This is the analog power supply input for the MX20XX. VDA should always be connected to VDD.

GND - This is the ground pin for the MX20XX.

AOUTX - This pin is the output of the x-acceleration sensor.

AOUTY - This pin is the output of the y-acceleration sensor.

TOUT - This pin is the buffered output of the temperature sensor. The voltage at TOUT is an indication of the

die temperature. This voltage can be measured and used to compensate out the temperature dependence of
accelerometer sensitivity.

SCK - Standard product is delivered with an Internal Clock option. Ground this pin when operating with the
Internal Clock. The External Clock must be ordered special from the factory.

VREF - A reference voltage is output from this pin.

®MEMSIC, Inc. 2000.
100 Burtt Road, Andover, MA 01810
Tel: [phone] • Fax: [phone]
www.memsic.com

MX205Q

MX205Q ANALOG Data Sheet N 8/1/01

Package Outline
LCC-8 mm (in)

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
implications or otherwise under any patent or patent
rights of MEMSIC.

Preliminary technical information.
Subject to change without notice.

Data Sheet

Page 6 of 8

®MEMSIC, Inc. 2000.
100 Burtt Road, Andover, MA 01810
Tel: [phone] • Fax: [phone]
www.memsic.com

MX205Q

MX205Q ANALOG Data Sheet N 8/1/01

Package Outline
TO-100 mm (in)

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
implications or otherwise under any patent or patent
rights of MEMSIC.

Preliminary technical information.
Subject to change without notice.

Data Sheet

Page 7 of 8

®MEMSIC, Inc. 2000.
100 Burtt Road, Andover, MA 01810
Tel: [phone] • Fax: [phone]
www.memsic.com

MX205Q

MX205Q ANALOG Data Sheet N 8/1/01

Page 8 of 8

Data Sheet

MX205Q

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
implications or otherwise under any patent or patent
rights of MEMSIC.

Technical information.
Subject to change without notice.

Layout Notes

1. Use robust low inductance ground
wiring

2. Liberal use of ceramic bypass
capacitors

3. The capacitors should be located
as close as possible to the device
supply pins (VDA, VDD).

4. The capacitor lead length should
be as short as possible. Surface
mount capacitors are preferred.

Printed Circuit Board Layout and
Filter Requirements

®MEMSIC, Inc. 2000.
100 Burtt Road, Andover, MA 01810
Tel: [phone] • Fax: [phone]
www.memsic.com

MX201Q ANALOG Data Sheet N 8/1/01

Filtering Notes

1. Low pass filter – 200Hz, -3db

2. Ceramic capacitors C3, C
4

3. f = 1/2πRC

4. Resistor R3, R4– 1/8 Watt,

5% tolerance

5. Reference Application Note

# AN-00MX-004

R3=

C3=

C4=

R4=