MXC6202XK HTML VIEW PDF DOWNLOAD, MXC6202XK データシート

MXC6202XK データシートの表示（PDF） - Unspecified

部品番号

コンポーネント説明

一致するリスト

MXC6202XK

Ultra Low Cost, ±2.0 g Dual Axis Accelerometer With I2C Interface

Unspecified

MXC6202XK Datasheet PDF : 11 Pages

1 2 3 4 5 6 7 8 9 10

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 that the

proof mass in the MEMSIC sensor is a gas.

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

www.memsic.com for a picture/graphic description of

the free convection heat transfer principle.

MXC6202xJ/K PIN DESCRIPTIONS

VDD – This is the supply input for the circuits and the

sensor heater in the accelerometer. The DC voltage

should be between 2.7 and 3.6 volts. Refer to the

section on PCB layout and fabrication suggestions for

guidance on external parts and connections

recommended.

GND– This is the ground pin for the accelerometer.

COM– This pin should be connected to ground.

TEST– Do Not Connect, factory use only.

VDD2– 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 be equal to or less than the voltage on

VDD. Power should be applied to VDD first unless VDD2

power supply voltage equals VDD, in which case power

may be applied to VDD and VDD2 simultaneously.

SDA– This pin is the I2C serial data line, and operates

in FAST (400 KHz.) mode.

SCL– 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 for 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.

The following table and figure help to illustrate the

output changes in the X- and Y-axes as the unit is

tilted from +90° to 0°. 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).

Accelerometer Position Relative to Gravity

X-Axis

Y-Axis

X-Axis

Orientation

Change

To Earth’s

X per deg.

per deg.

Surface

Output of tilt Output of tilt

(deg.)

(g)

(mg)

(g)

(mg)

1.000

0.15

0.000 17.45

0.996

1.37

0.087 17.37

0.985

2.88

0.174 17.16

0.940

5.86

0.342 16.35

0.866

8.59

0.500 15.04

0.707 12.23