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參數(shù)資料
| 型號： | D2002AL |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | Low Cost, 【10 g Dual Axis Accelerometer with Digital Outputs |
| 中文描述： | 低成本，【10克雙軸加速度計的數(shù)字輸出 |
| 文件頁數(shù)： | 3/8頁 |
| 文件大小： | 378K |
| 代理商： | D2002AL |
ABSOLUTE MAXIMUM RATINGS*
Supply Voltage (V
DD
, V
DA
) ………………...-0.5 to +7.0V
Storage Temperature ……….…………-65
°
C to +150
°
C
Acceleration ……………………………………..50,000
g
*Stresses above those listed under Absolute Maximum Ratings may cause permanent
damage to the device. This is a stress rating only; the functional operation of the
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
θ
JA
LCC-8
110
°
C/W
22
°
C/W
8
MEMSIC MXD2002A/B Rev.E
Page 3 of
8
5/15/2004
θ
JC
Device Weight
< 1 gram
4
1
2
3
7
6
5
Top View
M
X +g
Y +g
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. Small circle indicates pin one(1).
Pin Description: LCC-8 Package
Pin
Name
Description
1
T
OUT
Temperature (Analog Voltage)
2
D
OUTY
Y-Axis Acceleration Digital Signal
3
Gnd
Ground
4
V
DA
Analog Supply Voltage
5
D
OUTX
X-Axis Acceleration Digital Signal
6
V
ref
2.5V Reference
7
Sck
Optional External Clock
8
V
DD
Digital Supply Voltage
Ordering Guide
Model
Package Style
Digital
Output
100 Hz
400 Hz
D2002AL
D2002BL
*LCC parts are shipped in tape and reel packaging.
LCC-8 SMD*
LCC-8 SMD*
Caution
ESD (electrostatic discharge) sensitive device.
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
having a proof mass. The stationary element, or ‘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.
PIN DESCRIPTIONS
V
DD
– This is the supply input for the digital circuits and
the sensor heater in the
accelerometer
. The DC voltage
should be between 2.70 and 5.25 volts. Refer to the section
on PCB layout and fabrication suggestions for guidance on
external parts and connections recommended.
V
DA
– This is the power supply input for the analog
amplifiers in the
accelerometer
. 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
.
D
OUTX
– This pin is the digital output of the x-axis
acceleration sensor. It is factory programmable to 100 Hz
or 400 Hz. The user should ensure the load impedance is
sufficiently high as to not source/sink >100
μ
A typical.
While the sensitivity of this axis has been programmed at
the factory to be the same as the sensitivity for the y-axis,
the
accelerometer
can be programmed for non-equal
sensitivities on the x- and y-axes. Contact the factory for
additional information.
D
OUTY
–
This pin is the digital output of the y-axis
acceleration sensor. It is factory programmable to 100 Hz
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