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參數(shù)資料
| 型號： | MMA2260EG |
| 廠商： | 飛思卡爾半導(dǎo)體(中國)有限公司 |
| 英文描述： | 【1.5g X-Axis Micromachined Accelerometer |
| 中文描述： | 【一點五克X軸微加速度計 |
| 文件頁數(shù)： | 4/9頁 |
| 文件大?。?/td> | 270K |
| 代理商： | MMA2260EG |
Sensors
4
Freescale Semiconductor
MMA2260D
PRINCIPLE OF OPERATION
The Freescale accelerometer is a surface-micromachined
integrated-circuit accelerometer.
The device consists of a surface micromachined
capacitive sensing cell (g-cell) and a CMOS signal
conditioning ASIC contained in a single integrated circuit
package. The sensing element is sealed hermetically at the
wafer level using a bulk micromachined “cap'' wafer.
The g-cell is a mechanical structure formed from
semiconductor materials (polysilicon) using semiconductor
processes (masking and etching). It can be modeled as a set
of beams attached to a movable central mass that moves
between fixed beams. The movable beams can be deflected
from their rest position by subjecting the system to an
acceleration (
Figure 3
).
As the beams attached to the central mass move, the
distance from them to the fixed beams on one side will
increase by the same amount that the distance to the fixed
beams on the other side decreases. The change in distance
is a measure of acceleration.
The g-cell beams form two back-to-back capacitors (). As
the central mass moves with acceleration, the distance
between the beams change and each capacitor's value will
change, (C = NA
ε
/D). Where A is the area of the facing side
of the beam, e is the dielectric constant, D is the distance
between the beams, and N is the number of beams.
The CMOS ASIC uses switched capacitor techniques to
measure the g-cell capacitors and extract the acceleration
data from the difference between the two capacitors. The
ASIC also signal conditions and filters (switched capacitor)
the signal, providing a high level output voltage that is
ratiometric and proportional to acceleration.
SPECIAL FEATURES
Filtering
Freescale accelerometers contain an onboard 2-pole
switched capacitor filter. Because the filter is realized using
switched capacitor techniques, there is no requirement for
external passive components (resistors and capacitors) to set
the cut-off frequency.
Self-Test
The sensor provides a self-test feature that allows the
verification of the mechanical and electrical integrity of the
accelerometer at any time before or after installation. A fourth
“plate'' is used in the g-cell as a self-test plate. When the user
applies a logic high input to the self-test pin, a calibrated
potential is applied across the self-test plate and the
moveable plate. The resulting electrostatic force
(Fe =
1
/
2
AV
2
/d
2
) causes the center plate to deflect. The
resultant deflection is measured by the accelerometer's
control ASIC and a proportional output voltage results. This
procedure assures that both the mechanical (g-cell) and
electronic sections of the accelerometer are functioning.
Status
Freescale accelerometers include fault detection circuitry
and a fault latch. The Status pin is an output from the fault
latch, OR'd with self-test, and is set high whenever the
following event occurs:
Parity of the EPROM bits becomes odd in number.
The fault latch can be reset by a rising edge on the self-test
input pin, unless one (or more) of the fault conditions
continues to exist.
Acceleration
Figure 3. Transducer
Physical Model
Figure 4. Equivalent
Circuit Model
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MMA2260EGR2 | 【1.5g X-Axis Micromachined Accelerometer |
| MMA2300EG | Surface Mount Micromachined Accelerometer |
| MMA2300EGR2 | Surface Mount Micromachined Accelerometer |
| MMA2301D | Surface Mount Micromachined Accelerometer |
| MMA2301DR2 | Surface Mount Micromachined Accelerometer |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MMA2260EGR2 | 功能描述:加速計 - 板上安裝 AIGEAS LOW G X-LAT RoHS:否 制造商:Murata 傳感軸:Double 加速:12 g 靈敏度: 封裝 / 箱體: 輸出類型:Analog 數(shù)字輸出 - 位數(shù):11 bit 電源電壓-最大:5.25 V 電源電壓-最小:4.75 V 電源電流:4 mA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C |
| MMA2300 | 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:Surface Mount Micromachined Accelerometer |
| MMA23-0051K1 | 功能描述:CONN RACK/PANEL 5POS 5A RoHS:否 類別:連接器，互連式 >> 背板 - 專用 系列:MM22 標(biāo)準(zhǔn)包裝:8 系列:PwrBlade® 連接器用途:- 連接器類型:插座，母插口和片狀插口 連接器類型:葉片形電源 位置數(shù):37 加載位置的數(shù)目:全部 間距:0.100"（2.54mm） 行數(shù):4 列數(shù):- 安裝類型:板邊緣，通孔，直角 端子:焊接 觸點布局，典型:24 信號，13 電源 特點:板鎖，導(dǎo)向引腳 觸點表面涂層:金 觸點涂層厚度:30µin（0.76µm） 顏色:黑 包裝:托盤 額定電流:- 材料可燃性額定值:UL94 V-0 工作溫度:-20°C ~ 105°C 額定電壓:- 其它名稱:51793-151793-1-ND |
| MMA23-0051P1 | 功能描述:機架和面板連接器 RoHS:否 制造商:AVX 系列: 產(chǎn)品類型: 位置/觸點數(shù)量: 安裝風(fēng)格: 端接類型: 外殼材料: 觸點材料: 觸點電鍍: |
| MMA23-0051Q1 | 功能描述:CONN RACK/PANEL 5POS 5A RoHS:否 類別:連接器，互連式 >> 背板 - 專用 系列:MM22 標(biāo)準(zhǔn)包裝:8 系列:PwrBlade® 連接器用途:- 連接器類型:插座，母插口和片狀插口 連接器類型:葉片形電源 位置數(shù):37 加載位置的數(shù)目:全部 間距:0.100"（2.54mm） 行數(shù):4 列數(shù):- 安裝類型:板邊緣，通孔，直角 端子:焊接 觸點布局，典型:24 信號，13 電源 特點:板鎖，導(dǎo)向引腳 觸點表面涂層:金 觸點涂層厚度:30µin（0.76µm） 顏色:黑 包裝:托盤 額定電流:- 材料可燃性額定值:UL94 V-0 工作溫度:-20°C ~ 105°C 額定電壓:- 其它名稱:51793-151793-1-ND |
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