MXC62320XV

MXC62320XV Datasheet

MXC6232xX

Part	Datasheet
MXC62320XV	MXC62320XV (pdf)

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Low Power, Low Profile ±2 g Dual Axis Accelerometer with I2C Interface MXC6232xX FEATURES • RoHS compliant • I2C Slave, FAST KHz. mode interface • 1.8V compatible IO • Small low profile package 5.5mm x 5.5mm x 1.4mm • Embedded Power up/down and self-test feature • On-chip temperature sensor available • Eight customer defined 7-bit addresses • V to V single supply continuous operation • Lower power consumption typically <2mA • >50,000g shock survival rating. • Resolution better than 1mg Information Appliances Cell Phones, PDA’s, Computer Peripherals Consumer LCD Projectors, Pedometers, Blood Pressure Monitor, Digital Cameras Gaming Joystick/RF Interface/Menu Selection/Tilt Sensing GPS Electronic Compass Tilt Correction, Dead Reckoning Assist GENERAL DESCRIPTION The MXC6232xX is low cost, dual axis accelerometers fabricated on a standard, submicron CMOS process. It is a complete sensing system with on-chip mixed signal processing and integrated I2C bus, allowing the device to be connected directly to a microprocessor eliminating the need for A/D converters or timing resources. The MXC6232xX measures acceleration with a full-scale range of ±2 g and a sensitivity of 512counts/g V at 25°C. It can measure both dynamic acceleration e.g. vibration and static acceleration e.g. gravity . The MXC6232xX design is based on heat convection and requires no solid proof mass. TEMP Internal Oscillator VREF Heater Control Coarse Fine Gain Adj. Adj. Temperature Sensor TEMP X aixs Temp Comp. CLK TEMP CLK Coarse Fine Gain Adj. Adj. IIC Convertor Y aixs Temp Comp. Acceleration Sensor CLKTEMP CLK MXC6232xX FUNCTIONAL BLOCK DIAGRAM No Connect No Connect SCL SDA This design eliminates the stiction problems associated with legacy technologies and provides shock survival greater than 50,000g’s. Memsic’s solid state design leads to significantly lower failure rates in customer applications and lower loss due to handling during manufacturing and assembly processes It is packaged in a small low profile LCC surface mount package 5.5mm x 5.5mm x 1.4mm with a maximum height of 1.5mm and is available for operating temperature ranges of -40°C to +85°C. The MXC6232xX provides I2C digital output with 400 KHz, fast mode operation. The maximum noise floor is 1 mg/ Hz allowing signals below 1mg to be resolved at 1 Hz bandwidth 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. 800 Turnpike St., Suite 202, North Andover, MA01845, USA Tel: Fax: Page 1 of 8 11/14/2009 Ordering Guide MXC6232xXV Package type Code V Type LCC8 RoHS compliant Performance Grade: Code Temp -40~85°C Resolution 4096counts Note The MEMSIC logo’s arrow indicates the -X sensing direction of the device. The +Y sensing direction is rotated 90° away from the +X direction following the right-hand rule. Small circle indicates pin one Address code 0~7 Number Address All parts are shipped in tape and reel packaging. Caution ESD electrostatic discharge sensitive device. Page 4 of 8 11/14/2009 THEORY OF OPERATION The MEMSIC device is a complete dual-axis acceleration measurement system fabricated on a monolithic CMOS IC process. The device operation is based on heat transfer by natural convection and operates like other accelerometers except it is a gas in the MEMSIC sensor. A single heat source, centered in the silicon chip is suspended across a cavity. Equally spaced aluminum/polysilicon thermopiles groups of thermocouples are located equidistantly on all four sides of the heat source dual axis . Under zero acceleration, a temperature gradient is symmetrical about the heat source, so that the temperature is the same at all four thermopiles, causing them to output the same voltage. Acceleration in any direction will disturb the temperature profile, due to free convection heat transfer, causing it to be asymmetrical. The temperature, and hence voltage output of the four thermopiles will then be different. The differential voltage at the thermopile outputs is directly proportional to the acceleration. There are two identical acceleration signal paths on the accelerometer, one to measure acceleration in the x-axis and one to measure acceleration in the y-axis. Please visit the MEMSIC website at for a picture/graphic description of the free convection heat transfer principle. MXC6232xX PIN DESCRIPTIONS VDD This is the supply input for the circuits and the sensor heater in the accelerometer. The DC voltage should be between and volts. Refer to the section on PCB layout and fabrication suggestions for guidance on external parts and connections recommended. This is the ground pin for the accelerometer. This pin should be connected to ground. Do Not Connect, factory use only. This pin is the I2C input digital power supply, the voltage on this pin determines the I2C bus logic voltage, and is 1.8V compatible. Note The voltage on this pin should never go higher than the voltage on VDD, if VDD2 has a lower power supply voltage than VDD, power should be applied to VDD first. This pin is the I2C serial data line, and operates in FAST 400 KHz. mode. This pin is the I2C serial clock line, and operates in FAST 400 KHz. mode. DISCUSSION OF TILT APPLICATIONS AND RESOLUTION Tilt Applications One of the most popular applications of the MEMSIC accelerometer product line is in tilt/inclination measurement. An accelerometer uses the force of gravity as an input to determine the inclination angle of an object. A MEMSIC accelerometer is most sensitive to changes in position, or tilt, when the accelerometer’s sensitive axis is perpendicular to the force of gravity, or parallel to the Earth’s surface. Similarly, when the accelerometer’s axis is parallel to the force of gravity perpendicular to the Earth’s surface , it is least sensitive to changes in tilt. Following table and figure help illustrate the output changes in the X- and Y-axes as the unit is tilted from +90° to Notice that when one axis has a small change in output per degree of tilt in mg , the second axis has a large change in output per degree of tilt. The complementary nature of these two signals permits low cost accurate tilt sensing to be achieved with the MEMSIC device reference application note AN-00MX-007 . MEMSIC Accelerometer Position Relative to Gravity X-Axis Orientatio n To Earth’s Surface deg. 90 85 80 70 60 45 30 20 10 5 0 X-Axis Y-Axis X Output g Change per deg. of tilt mg Y Output g Change per deg. of tilt mg Changes in Tilt for X- and Y-Axes

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Low Power, Low Profile ±2 g Dual Axis Accelerometer with I2C Interface

MXC6232xX

FEATURES
• RoHS compliant
• I2C Slave, FAST KHz. mode interface
• 1.8V compatible IO
• Small low profile package 5.5mm x 5.5mm x 1.4mm
• Embedded Power up/down and self-test feature
• On-chip temperature sensor available
• Eight customer defined 7-bit addresses
• V to V single supply continuous operation
• Lower power consumption typically <2mA
• >50,000g shock survival rating.
• Resolution better than 1mg

Information Appliances Cell Phones, PDA’s, Computer Peripherals

Consumer LCD Projectors, Pedometers, Blood Pressure Monitor, Digital Cameras

Gaming Joystick/RF Interface/Menu Selection/Tilt Sensing

GPS Electronic Compass Tilt Correction, Dead

Reckoning Assist

GENERAL DESCRIPTION The MXC6232xX is low cost, dual axis accelerometers fabricated on a standard, submicron CMOS process. It is a complete sensing system with on-chip mixed signal processing and integrated I2C bus, allowing the device to be connected directly to a microprocessor eliminating the need for A/D converters or timing resources. The MXC6232xX measures acceleration with a full-scale range of ±2 g and a sensitivity of 512counts/g V at 25°C. It can measure both dynamic acceleration e.g. vibration and static acceleration e.g. gravity . The MXC6232xX design is based on heat convection and requires no solid proof mass.

TEMP

Internal

Oscillator

VREF

Heater Control

Coarse Fine Gain Adj. Adj.

Temperature Sensor

TEMP

X aixs

Temp Comp.

CLK TEMP CLK

Coarse Fine Gain Adj. Adj.

IIC Convertor

Y aixs

Temp Comp.

Acceleration Sensor

CLKTEMP CLK

MXC6232xX FUNCTIONAL BLOCK DIAGRAM

No Connect

No Connect

SCL SDA

This design eliminates the stiction problems associated with legacy technologies and provides shock survival greater than 50,000g’s. Memsic’s solid state design leads to significantly lower failure rates in customer applications and lower loss due to handling during manufacturing and assembly processes

It is packaged in a small low profile LCC surface mount package 5.5mm x 5.5mm x 1.4mm with a maximum height of 1.5mm and is available for operating temperature ranges of -40°C to +85°C.

The MXC6232xX provides I2C digital output with 400 KHz, fast mode operation.

The maximum noise floor is 1 mg/ Hz allowing signals below 1mg to be resolved at 1 Hz bandwidth

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.
800 Turnpike St., Suite 202, North Andover, MA01845, USA

Tel:

Fax:

Page 1 of 8
11/14/2009
Ordering Guide MXC6232xXV

Package type Code V

Type LCC8 RoHS compliant

Performance Grade:

Code

Temp
-40~85°C

Resolution 4096counts

Note The MEMSIC logo’s arrow indicates the -X sensing direction of the device. The +Y sensing direction is rotated 90° away from the +X direction following the right-hand rule. Small circle indicates pin one

Address code 0~7

Number Address

All parts are shipped in tape and reel packaging. Caution ESD electrostatic discharge sensitive device.

Page 4 of 8
11/14/2009

THEORY OF OPERATION The MEMSIC device is a complete dual-axis acceleration measurement system fabricated on a monolithic CMOS IC process. The device operation is based on heat transfer by natural convection and operates like other accelerometers except it is a gas in the MEMSIC sensor.

A single heat source, centered in the silicon chip is suspended across a cavity. Equally spaced aluminum/polysilicon thermopiles groups of thermocouples are located equidistantly on all four sides of the heat source dual axis . Under zero acceleration, a temperature gradient is symmetrical about the heat source, so that the temperature is the same at all four thermopiles, causing them to output the same voltage.

Acceleration in any direction will disturb the temperature profile, due to free convection heat transfer, causing it to be asymmetrical. The temperature, and hence voltage output of the four thermopiles will then be different. The differential voltage at the thermopile outputs is directly proportional to the acceleration. There are two identical acceleration signal paths on the accelerometer, one to measure acceleration in the x-axis and one to measure acceleration in the y-axis. Please visit the MEMSIC website at for a picture/graphic description of the free convection heat transfer principle.

MXC6232xX PIN DESCRIPTIONS VDD This is the supply input for the circuits and the sensor heater in the accelerometer. The DC voltage should be between and volts. Refer to the section on PCB layout and fabrication suggestions for guidance on external parts and connections recommended.

This is the ground pin for the accelerometer.

This pin should be connected to ground.

Do Not Connect, factory use only.

This pin is the I2C input digital power supply, the voltage on this pin determines the I2C bus logic voltage, and is 1.8V compatible. Note The voltage on this pin should never go higher than the voltage on VDD, if VDD2 has a lower power supply voltage than VDD, power should be applied to VDD first.

This pin is the I2C serial data line, and operates in FAST 400 KHz. mode.

This pin is the I2C serial clock line, and operates in FAST 400 KHz. mode.

DISCUSSION OF TILT APPLICATIONS AND RESOLUTION

Tilt Applications One of the most popular applications of the MEMSIC accelerometer product line is in tilt/inclination measurement. An accelerometer uses the force of gravity as an input to determine the inclination angle of an object.

A MEMSIC accelerometer is most sensitive to changes in position, or tilt, when the accelerometer’s sensitive axis is perpendicular to the force of gravity, or parallel to the Earth’s surface. Similarly, when the accelerometer’s axis is parallel to the force of gravity perpendicular to the Earth’s surface , it is least sensitive to changes in tilt.

Following table and figure help illustrate the output changes in the X- and Y-axes as the unit is tilted from +90° to Notice that when one axis has a small change in output per degree of tilt in mg , the second axis has a large change in output per degree of tilt. The complementary nature of these two signals permits low cost accurate tilt sensing to be achieved with the MEMSIC device reference application note AN-00MX-007 .

MEMSIC

Accelerometer Position Relative to Gravity

X-Axis Orientatio n To Earth’s Surface deg.
90 85 80 70 60 45 30 20 10 5 0

X-Axis

Y-Axis

X Output g

Change per deg.
of tilt mg

Y Output g

Change per deg.
of tilt mg

Changes in Tilt for X- and Y-Axes

Notice: we do not provide any warranties that information, datasheets, application notes, circuit diagrams, or software stored on this website are up-to-date or error free. The archived MXC62320XV Datasheet file may be downloaded here without warranties.

Datasheet ID: MXC62320XV 647838