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参数资料
| 型号： | MMA7361LR2 |
| 厂商： | Freescale Semiconductor |
| 文件页数： | 4/11页 |
| 文件大小： | 0K |
| 描述： | ACCELEROMETER 1.5G XYZ 14-LGA |
| 产品变化通告： | MMA73x Family Discontinuation 04/May/2010 |
| 标准包装： | 5,000 |
| 轴： | X，Y，Z |
| 加速范围： | ±1.5g，6g（配置） |
| 灵敏度： | 800mV/g，206mV/g |
| 电源电压： | 2.2 V ~ 3.6 V |
| 输出类型： | 模拟 |
| 带宽： | 400Hz - XY，300Hz - Z |
| 接口： | 并联 |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 14-VFLGA |
| 供应商设备封装： | 14-LGA（3x5） |
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 signal conditioning ASIC
contained in a single 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 move
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
distance between the beams changes and each capacitor's
value will change, (C = A ε /D). Where A is the area of the
beam, ε is the dielectric constant, and D is the distance
between the beams.
protection where system integrity must be ensured over the
life of the product. Customers can use self test to verify the
solderability to confirm that the part was mounted to the PCB
correctly. To use this feature to verify the 0g-Detect function,
the accelerometer should be held upside down so that the
z-axis experiences -1g. When the self test function is
initiated, an electrostatic force is applied to each axis to
cause it to deflect. The x- and y-axis are deflected slightly
while the z-axis is trimmed to deflect 1g. This procedure
assures that both the mechanical (g-cell) and electronic
sections of the accelerometer are functioning.
g-Select
The g-Select feature allows for the selection between two
sensitivities. Depending on the logic input placed on pin 10,
the device internal gain will be changed allowing it to function
with a 1.5g or 6g sensitivity ( Table 3 ). This feature is ideal
when a product has applications requiring two different
sensitivities for optimum performance. The sensitivity can be
changed at anytime during the operation of the product. The
g-Select pin can be left unconnected for applications
requiring only a 1.5g sensitivity as the device has an internal
pull-down to keep it at that sensitivity (800mV/g)).
Table 3. g-Select Pin Description
The 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,
g-Select
0
1
g-Range
1.5g
6g
Sensitivity
800 mV/g
206 mV/g
providing a high level output voltage that is ratiometric and
proportional to acceleration.
Acceleration
Figure 3. Simplified Transducer Physical Model
SPECIAL FEATURES
0g-Detect
The sensor offers a 0g-Detect feature that provides a logic
high signal when all three axes are at 0g. This feature
enables the application of Linear Freefall protection if the
signal is connected to an interrupt pin or a poled I/O pin on a
microcontroller.
Self Test
The sensor provides a self test feature that allows the
Sleep Mode
The 3 axis accelerometer provides a Sleep Mode that is
ideal for battery operated products. When Sleep Mode is
active, the device outputs are turned off, providing significant
reduction of operating current. A low input signal on pin 7
(Sleep Mode) will place the device in this mode and reduce
the current to 3 μ A typ. For lower power consumption, it is
recommended to set g-Select to 1.5g mode. By placing a high
input signal on pin 7, the device will resume to normal mode
of operation.
Filtering
The 3 axis accelerometer contains an onboard single-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.
Ratiometricity
Ratiometricity simply means the output offset voltage and
sensitivity will scale linearly with applied supply voltage. That
is, as supply voltage is increased, the sensitivity and offset
increase linearly; as supply voltage decreases, offset and
sensitivity decrease linearly. This is a key feature when
interfacing to a microcontroller or an A/D converter because
it provides system level cancellation of supply induced errors
in the analog to digital conversion process.
verification of the mechanical and electrical integrity of the
accelerometer at any time before or after installation. This
feature is critical in applications such as hard disk drive
MMA7361L
Sensors
4
Freescale Semiconductor
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MMA7361LT | 功能描述:加速计 - 板上安装 1.5G XYZ LGA 14 LDS ENH RoHS:否 制造商:Murata 传感轴:Double 加速:12 g 灵敏度: 封装 / 箱体: 输出类型:Analog 数字输出 - 位数:11 bit 电源电压-最大:5.25 V 电源电压-最小:4.75 V 电源电流:4 mA 最大工作温度:+ 125 C 最小工作温度:- 40 C |
| MMA7368FLR1 | 功能描述:加速计 - 板上安装 1.5 XY ENHANCED RoHS:否 制造商:Murata 传感轴:Double 加速:12 g 灵敏度: 封装 / 箱体: 输出类型:Analog 数字输出 - 位数:11 bit 电源电压-最大:5.25 V 电源电压-最小:4.75 V 电源电流:4 mA 最大工作温度:+ 125 C 最小工作温度:- 40 C |
| MMA7368FLR2 | 功能描述:加速计 - 板上安装 1.5 XY ENHANCED RoHS:否 制造商:Murata 传感轴:Double 加速:12 g 灵敏度: 封装 / 箱体: 输出类型:Analog 数字输出 - 位数:11 bit 电源电压-最大:5.25 V 电源电压-最小:4.75 V 电源电流:4 mA 最大工作温度:+ 125 C 最小工作温度:- 40 C |
| MMA7368FLT | 功能描述:加速计 - 板上安装 1.5 XY ENHANCED RoHS:否 制造商:Murata 传感轴:Double 加速:12 g 灵敏度: 封装 / 箱体: 输出类型:Analog 数字输出 - 位数:11 bit 电源电压-最大:5.25 V 电源电压-最小:4.75 V 电源电流:4 mA 最大工作温度:+ 125 C 最小工作温度:- 40 C |
| MMA7368L | 制造商:FREESCALE 制造商全称:Freescale Semiconductor, Inc 功能描述:【1.5g Three Axis Low-g Micromachined Accelerometer |
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