MEMSIC MXP7205VW Rev.C Page 1 of 11 8/2/2011
Low Cost ±5 g Dual-Axis Accelerometer
with SPI Interface
Automotive Grade MXP7205VW
FEATURES
Dual axis accelerometer fabricated on a single CMOS IC
Monolithic design with mixed mode signal processing
Zero-g temperature stability better than ±30mg from –40C to
105C
Sensitivity temperature compensation better that ±3% from
-40C to 105C
± 5g dynamic range, 800LSB/g sensitivity
29Hz bandwidth
On Demand Self Test
>50,000 g shock survival rating
4.50V to 5.25V single supply operation
Small surface mount package, 5.5mm x 5.5mm x 2.7mm
XZ or XY mounting
RoHS compliant
AUTOMOTIVE APPLICATIONS
• Vehicle Stability Control
• Roll Over Detection
• Electronic Parking Break – Hill Start Assist
• Headlight Leveling and Steering
VDA
Vref
FM
CLK
CLK
TEMP
TEMP
CLK
CLK TEMP
CLK CLK
Temp
Comp.
Temp
Comp.
X axis
Y axis
CLK
Heater
Control
TEMP
SCK
SSB
Low Pass
A/D
Temperature
Sensor
Internal
Oscillator
Coarse
Gain Adj.
Fine Gain
Adj.
GND
Acceleration
Sensor
Coarse
Gain Adj.
Fine Gain
Adj.
VDD
Filter
CLK
CLK
Low Pass
A/D
Filter
SPI
Interface
MOSI
MISO
Reference
Voltage
Control
Register
CLK
MXP7205VW FUNCTIONAL BLOCK DIAGRAM
GENERAL DESCRIPTION
The MXP7205VW is a low cost, dual axis accelerometer
built on a standard, submicron CMOS process. It measures
acceleration with a full-scale range of ±5g and a sensitivity
of 800LSB/g with 14bits operation mode and 50LSB/g with
10bits operation mode.
The MXP7205VW provides an SPI interface.
The typical noise floor is 0.6mg /
Hz
, allowing signals
below 1mg to be resolved at 1Hz bandwidth. The inherent
3dB roll off of the device is 29Hz providing immunity to
and attenuation of higher frequency vibrations present in
automotive applications.
The MXP7205VW
is packaged in a hermetically sealed
LCC surface mount package (5.5 mm x 5.5 mm x 2.7 mm
height), and the package can be used for either XY and XZ
sensing, its operation temperature is -40°C to +105°C.
MEMSIC’s accelerometer technology allows for designs
from ±1 g to ±70 g with custom versions available above
±70 g. It can measure both dynamic acceleration (e.g.,
vibration) and static acceleration (e.g., gravity).
The design is based on heat convection and requires no
solid proof mass. This eliminates stiction, particle, and
inherent resonant frequency problems associated with
competitive devices and provides shock survivability to
greater that 50,000g, leading to significantly lower failure
rates and lower loss due to handling during assembly and at
customer field application.
Due to the standard CMOS structure of the MXP7205VW,
additional circuitry can easily be incorporated into custom
versions for high volume applications. Contact MEMSIC’s
local office for more information.
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.
One Technology Drive, Suite 325, Andover, MA01810, USA
Tel: +1 978 738 0900 Fax: +1 978 738 0196
www.MEMSIC.com
