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參數(shù)資料
| 型號： | MMA1260D |
| 廠商： | 飛思卡爾半導(dǎo)體(中國)有限公司 |
| 英文描述： | Low G Micromachined Accelerometer(小重力微電機加速計) |
| 中文描述： | 低摹微加速度計（小重力微電機加速計） |
| 文件頁數(shù)： | 4/8頁 |
| 文件大?。?/td> | 128K |
| 代理商： | MMA1260D |
4
Sensor Device Data
Freescale Semiconductor
MMA1260D
PRINCIPLE OF OPERATION
The Freescale Semiconductor accelerometeris asurface--
micromachined integrated--circuit accelerometer.
The device consists of a surface micromachined capaci-
tive 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 us-
ing a bulk micromachined “cap’’ wafer.
The g--cell is a mechanical structure formed fromsemicon-
ductor materials (polysilicon) using semiconductor pro-
cesses (masking and etching). It can be modeled as two
stationary plates with a moveable plate in--between. The
center plate can be deflected from its rest position by sub-
jecting the system to an acceleration (Figure 2).
When the center plate deflects, the distance from it to one
fixed plate will increase by the same amount that the dis-
tance to the other plate decreases. The change in distance is
a measure of acceleration.
The g--cell plates form two back--to--back capacitors (Fig-
ure 3). As the center plate moves with acceleration, the dis-
tance between the plates changes and each capacitor’s
value will change, (C = A
ε
/D). Where A is the area of the
plate,
ε
is the dielectric constant, and D is the distance be-
tween the plates.
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 ratio-
metric and proportional to acceleration.
Acceleration
Figure 2. Transducer
Physical Model
Figure 3. Equivalent
Circuit Model
SPECIAL FEATURES
Filtering
The Freescale Semiconductor accelerometers contain an
onboard 2--pole switched capacitor filter. A Bessel imple-
mentation is used because it provides a maximally flat delay
response (linear phase) thus preserving pulse shape integri-
ty. 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 fre-
quency.
Self--Test
The sensor provides a self--test feature that allows the ver-
ification of the mechanical and electrical integrity of the ac-
celerometer 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 cali-
brated 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 re-
sultant deflection is measured by the accelerometer’s control
ASIC and a proportional output voltage results. This proce-
dure assures that both the mechanical (g--cell) andelectronic
sections of the accelerometer are functioning.
Status
Freescale Semiconductor accelerometers include fault
detection circuitry and a fault latch. The Status pin is an out-
put 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.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MMA1260EG | Low G Micromachined Accelerometer |
| MMA1260 | Low G Micromachined Accelerometer |
| MMA1270D | Low G Micromachined Accelerometer(小重力微電機加速計) |
| MMA1270EG | Low G Micromachined Accelerometer |
| MMA2201D | Surface Mount Micromachined Accelerometer(表面安裝微電機加速計) |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MMA1260DEGR2 | 功能描述:IC ACCELEROMETER Z AXIS 16-SOIC RoHS:是 類別:傳感器，轉(zhuǎn)換器 >> 加速計 系列:MMA 標準包裝:1 系列:SCA1000 軸:X，Y 加速范圍:±1.7g 靈敏度:1.2V/g 電源電壓:4.75 V ~ 5.25 V 輸出類型:數(shù)字 帶寬:50±30Hz 接口:SPI 安裝類型:表面貼裝 封裝/外殼:12-SMD 供應(yīng)商設(shè)備封裝:12-SMD 其它名稱:551-1007-1 |
| MMA1260DR2 | 制造商:Rochester Electronics LLC 功能描述: |
| MMA1260EG | 功能描述:加速計 - 板上安裝 4.75-5.25 VOLT 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 |
| MMA1260EG | 制造商:Freescale Semiconductor 功能描述:IC SENSOR ACCEL Z-AXIS 50G SOIC16 |
| MMA1260EGR2 | 功能描述:加速計 - 板上安裝 COLOSUS 1.5 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 |
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