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MEMSIC

MXC6244AU Datasheet Preview

MXC6244AU Datasheet

2 Axis Accelerometer

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±8g 2 Axis Accelerometer with
Programmable Vibration Filter
FEATURES
High accuracy 2-axis accelerometer:
o 8g FSR, 1mg/LSB resolution
o 0.3 mg/C offset drift over
temperature
o 0.5% Sensitivity matching over
temperature
Programmable anti-vibration filter
o Attenuation >60dB @ 50Hz
o No sensor resonance
Internal angle detection circuit with 8
programmable thresholds and INT output
400kHz I2C Interface (1.8V compatible)
Built-in self-test functionality
Small, 6-pin 3 x 3 x 1 mm LCC package
Operates from 2.7 V to 5.5 V Supply
High reliability automotive process and
package
RoHS compliant
Operates from -40C to +125C
DESCRIPTION
The MXC6244AU is a complete 2 axis accelerometer
system with a programmable internal anti-vibration
filter. This filter can provide as much as 45dB
attenuation above 25Hz, and 60dB attenuation above
50Hz (see “Response to Vibration” section). In
addition, the device has 8 built in, I2C programmable
angle thresholds. If the device orientation with respect
to vertical exceeds the programmed threshold angle,
the INT output changes state to alert the system to a
tip-over or fall down event. This feature can offload the
processor from the burden of continuously calculating
angles. In the case of an INT, the processor can begin
calculating angles to allow for user-defined algorithms
to be implemented.
A built-in self-test function can detect a fault in the
internal sensor, and if triggered will cause the INT
output to go to a high impedance state. The internal
status of the sensor can be read via the I2C interface.
MXC6244AU
APPLICATIONS
Inclination Sensing in High Vibration
Environments
Motorcycle Fall-Down Detection
Off-Road Vehicle Roll Detection
Jet Ski Roll Detection
General Purpose Acceleration Measurements
VDD
SCK SDA
2-Axis
Sensor
Signal
Cond’g
&A/D
DSP,
Vibration
Filter
3-state
Output
Driver
INT
Trim &
Cal
Circuits
Ref &
Bias
Gen
Clock &
Timing
Gen
GND
FIGURE 1. FUNCTIONAL BLOCK DIAGRAM
The MXC6244AU uses MEMSIC’s proprietary thermal
accelerometer technology. Because the sensing
element uses heated gas molecules instead of a
mechanical beam structure, the device is extremely
robust and reliable, with 50,000g shock tolerance, no
possibility of “stiction,” virtually no mechanical
resonance, and very high accuracy over temperature.
This makes the device extremely well suited to harsh
or high vibration environments, where other sensors
can exhibit false readings due to resonance or other
errors.
The MXC6244AU runs from a single 2.7V to 5.5V
supply, and is packaged in a small 6-pin, 3 x 3 x 1 mm
LCC package.
Information furnished by MEMSIC is believed to be accurate and reliable.
However, no responsibility is assumed by MEMSIC for its use, or 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.
One Technology Drive, Suite 325, Andover, MA01810, USA
Tel: +1 978 738 0900
Fax: +1 978 738 0196
www.memsic.com
MEMSIC MXC6244AU Rev.C
Page 1 of 15
Formal release date: 11/16/2016




MEMSIC

MXC6244AU Datasheet Preview

MXC6244AU Datasheet

2 Axis Accelerometer

No Preview Available !

SENSOR CHARACTERISTICS:
(TA=25C, VDD= 5V, Fs=3125Hz, unless otherwise specified. Typical values are specified at 25C)
Parameter
Full Scale Range
Sensitivity
Zero-g Bias
Threshold Angles
Threshold Accuracy
Sensor Bandwidth
Input Referred Noise
Offset shift when self-test is
asserted
Resonance
LOW-g Lockout Threshold
Conditions
TA=25C
Temperature Drift (-40 to +85C)
X/Y Matching over Temperature (-40 to +85C)
TA=25C
Temperature Drift (-40 to +85C)
Programmable via I2C
(Note 2)
Total RMS Noise, ODR = 1.5Hz
Total RMS Noise, ODR = 100Hz
X-offset (ST[2:0]=111)
Y-offset (ST[2:0]=111)
(Note 3)
(Note 4)
Min Typ Max
8
975 1024 1075
±6 ±8.51
±0.3 ±0.51,5
±10 ±301
±0.1
±0.31
40, 42.5,
45, 50,
55, 60,
65, 70
±4
11
0.75
1.5
+2
-2
Undetectable
±0.375
Units
g
LSB/g
%
%
mg
mg/C
Deg
Deg
Hz
mg rms
g
Hz
g
Note 1:
Note 2:
Note 3:
Note 4:
Note 5:
Established statistically as the average value ±3 standard deviations from 30 pieces x 3 lot characterization data
The sensor has an inherent low pass filter characteristic which is very effective in attenuating out of band vibration.
The thermal accelerometer sensors use heated gas molecules, and have no measurable resonance
The LOW-G Lockout feature disables tip-over detection if the magnitude of both X and Y acceleration vectors fall below 0.375g (as in
the case of a free-fall or large off-axis tilt condition). See also “Fault Detection”.
Indicates how closely X and Y axis sensitivities’ change over temperature.
MEMSIC MXC6244AU Rev.C
Page 2 of 15
Formal release date: 11/16/2016


Part Number MXC6244AU
Description 2 Axis Accelerometer
Maker MEMSIC
Total Page 15 Pages
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