Data Sheet
MX205Q
Page 1 of 8
MX205Q (RATIOMETRIC)
Low Cost, 5.0g, Dual Axis Accelerometer
with Analog Outputs
General Description
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 ± 5.0g 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 accelera-
tion, (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:
S
IN
X
(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.
Features
• 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
Block Diagram of MX20XX
Information furnished by MEMSIC is believed to be
accurate and reliable. However, no responsibility is
assumed by MEMSIC for its use, nor for any infringe-
ments 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.
MX205Q ANALOG Data Sheet M 8/1/01
®MEMSIC, Inc. 2000.
100 Burtt Road, Andover, MA 01810
Tel: 978.623.8188 • Fax: 978.623.9945
www.memsic.com
Data Sheet
MX205Q
Page 2 of 8
MX205Q SPECIFICATIONS
Analog Electrical Characteristics
Measurements @ 25°C Acceleration = 0g unless otherwise noted
V
DD
, V
DA
= 5.0V unless otherwise specified
Parameter
SENSOR
Measurement Range
1
Nonlinearity
Alignment Error
2
SENSITIVITY
ANALOG OUTPUTS
Sensitivity
Temperature Changes
8
Cross-Axis Sensitivity
3
ZERO g BIAS LEVEL
11
0g Offset vs.
Temperature
4
NOISE PERFORMANCE
Noise Density
5
in 40 Hz Bandwidth
FREQUENCY RESPONSE
3 dB Bandwidth
3 dB Bandwidth
7
Tout Voltage
Temp sensor sensitivity
V REFERENCE
9
SELF TEST
Voltage Delta at outputs
@5V Supply
@2.7V Supply
X, Y OUTPUTS
10
Conditions
Each axis
MEMSIC MX205Q
Min Typ Max
+/- 5.0
Units
NOTES
1
Guarantee by measurements of initial offset
and sensitivity.
Best Fit Straight
Line
Each axis
90
2%
+/- 1.0
+/- 2.5
g
% of FS
degrees
2
Alignment error is specified as the angle between
the true and indicated axis of sensitivity.
Cross-axis sensitivity is the algebraic sum of the
alignment and the inherent sensitivity errors.
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.
Noise density (µg/√Hz rms) is the average noise at any
frequency in the bandwidth of the device.
The voltage is required to ramp full scale before
making a measurement.
3
100
110
mV/g
4
Delta from 25°C per formula
S
IN
X (T
IN
)
2.67
= S
FIN
X (T
FIN
)
2.67
X sensor to Y sensor
Each axis
2.0
+/- 2
2.2
2.0
2.4
%
V
mg/°C
5
6
7
@ +25°C
750
1000
µg/√Hz rms
Note: Frequency compensating circuit will achieve
160 Hz operations. See Application Note (AN-00MX-002) .
Application boards available.
Defined as the output change from ambient to
maximum temperature or minimum. For more
details refer to Application Note (AN-00MX-002).
For more details refer to Application Note
(AN-00MX-001).
Operating at maximum current drive capabilities,
shifting of baseline sensitivity may occur.
Ratiometric analog output voltage will be 44.0%
of VDD, VDA supply.
All min and max specifications are subject to change
without notification.
Information furnished by MEMSIC is believed to be
accurate and reliable. However, no responsibility is
assumed by MEMSIC for its use, nor for any infringe-
ments 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.
8
40
160
25°C
25°C
Continuous,
Output rails with
failure
Current drive
capabilities,
source/sink
-2.5
1.23
2.4
1.25
2.5
1.27
5
2.6
Hz
Hz
V
mV/°K
V
9
10
5.0
2.7
+2.5
V
V
mA
11
POWER SUPPLY
Operating Voltage Range
Specified Performance
Quiescent Supply Current @ 5V
Quiescent Supply Current @ 2.7V
Turn-On Time
6
TEMPERATURE RANGE
Operating Range
2.7
3.0
4.0
200
-40
5.25
3.5
4.5
400
125
V
mA
mA
ms
°C
MX205Q ANALOG Data Sheet N 8/1/01
®MEMSIC, Inc. 2000.
100 Burtt Road, Andover, MA 01810
Tel: 978.623.8188 • Fax: 978.623.9945
www.memsic.com
Data Sheet
MX205Q
Page 3 of 8
ABSOLUTE MAXIMUM RATINGS*
Symbol
VDD
TSTG
Parameter
Supply Voltage to Ground Potential
Storage Temperature
Acceleration
Rating
-0.5 to 7.0
-65 to +150
50,000
Units
Volts
Deg C
g
TO-100
*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.
PACKAGE CHARACTERISTICS
Package
TO-100
LCC-8
ThetaJA
150°C/W
110°C/W
ThetaJC
25°C/W
22°C/W
Device Weight
0.04 oz
0.02 oz
TOP
VIEW
Y +g
X +g
ORDERING GUIDE
Model
MX205QC
MX205QL
Package Style
TO-100 Metal Can
LCC-8 SMD
*
LCC-8
TO-100
Axes of Sensitivity
*
LCC parts are shipped in tape and reel packaging.
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.
Y +g
CAUTION
ESD (electrostatic discharge) sensitive device.
TOP
VIEW
X +g
LCC-8
Axes of Sensitivity
MX205Q ANALOG Data Sheet N 8/1/01
®MEMSIC, Inc. 2000.
100 Burtt Road, Andover, MA 01810
Tel: 978.623.8188 • Fax: 978.623.9945
www.memsic.com
Data Sheet
MX205Q
Page 4 of 8
Pin Function Descriptions
TOP-100 and LCC-8
PIN DESCRIPTION: TO -100 Package
Pin
1
2
3
4
5
6
7
8
9
10
Name
VDD
TOUT
AOUTY
GND
n/c
VDA
AOUTX
VREF
SCK
RBias
Description
Digital Supply Voltage
Temperature
Acceleration Signal
Ground
no connection
Analog Supply Voltage
Acceleration Signal
2.50V Reference Voltage
Serial Clock
no connection
1
2
3
4
10
9
8
7
*
5
6
Top View
PIN DESCRIPTION: LCC-8 Package
Pin
1
2
3
4
5
6
7
8
Name
TOUT
AOUTY
GND
VDA
AOUTX
VREF
SCK
VDD
Description
Temperature
Acceleration Signal
Ground
Analog Supply Voltage
Acceleration Signal
2.50V Reference Voltage
Serial Clock
Digital Supply Voltage
*
*
Optional external clock factory programmed
per customer request
Top View
MX205Q ANALOG Data Sheet N 8/1/01
®MEMSIC, Inc. 2000.
100 Burtt Road, Andover, MA 01810
Tel: 978.623.8188 • Fax: 978.623.9945
www.memsic.com
Data Sheet
MX205Q
Page 5 of 8
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.
MX205Q ANALOG Data Sheet N 8/1/01
®MEMSIC, Inc. 2000.
100 Burtt Road, Andover, MA 01810
Tel: 978.623.8188 • Fax: 978.623.9945
www.memsic.com
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