加速传感器(mma7260q)在线座谈和常见问题解答.mht

来自「一些关于加速度传感器的资料」· MHT 代码 · 共 1,441 行 · 第 1/5 页

                <TD bgColor=3D#ffffff>[ =B4=F0=B0=B8 36 ]</TD>
                <TD colSpan=3D2>The error depends on many factors, =
including A/D=20
                  sampling rate, A/D conversion resolution, the sensor=20
                  sensitivity and noise distorsion. So it is important =
to select=20
                  high sensitivity and bandwidth sensor. </TD></TR>
              <TR>
                <TD bgColor=3D#c6d7ef>[ =CE=CA=CC=E2 37 ]</TD>
                <TD bgColor=3D#c6d7ef =
colSpan=3D2>=C8=E7=BA=CE=D3=D0=D0=A7=BF=B9=C6=FB=B3=B5=B5=C4=B8=DF=C6=B5=B8=
=C9=C8=C5?</TD></TR>
              <TR>
                <TD bgColor=3D#ffffff>[ =B4=F0=B0=B8 37 ]</TD>
                <TD colSpan=3D2>The sensor output purity depends on the =
input=20
                  power. There is detailed information about power =
design on the=20
                  application note (AN1988). It can be found on =
Freescale=20
                  website. </TD></TR>
              <TR>
                <TD bgColor=3D#b0d7b8>[ =CE=CA=CC=E2 38 ]</TD>
                <TD bgColor=3D#b0d7b8 =
colSpan=3D2>=C7=EB=CE=CAC=A3=ADV=B1=E4=BB=BB=BA=F3=CE=AA=CA=B2=C3=B4=B2=C9=
=D1=F9=A3=AC=D6=B1=BD=D3=CA=E4=B3=F6=B2=BB=BF=C9=D2=D4=C2=F0?</TD></TR>
              <TR>
                <TD bgColor=3D#ffffff>[ =B4=F0=B0=B8 38 ]</TD>
                <TD colSpan=3D2>There are many reasons for this. For one =
thing,=20
                  we have an integrator on board and we need to perform =
sampling=20
                  to acquire the value of the capacitance of the sensor. =
So=20
                  there would be switching noises. For this signal =
conditioning=20
                  and filter is performed. Also we have temperature =
compensation=20
                  circuitries. </TD></TR>
              <TR>
                <TD bgColor=3D#c6d7ef>[ =CE=CA=CC=E2 39 ]</TD>
                <TD bgColor=3D#c6d7ef =
colSpan=3D2>=D4=DA=B7=C9=CB=BC=BF=A8=B6=FB=CD=F8=D5=BE=C9=CF=BF=B4=B5=BD,=
=20
                  =
=C8=FD=D0=C7=B5=E7=D7=D3=D4=DA=CA=FD=D7=D6=D2=F4=C6=B5=B2=A5=B7=C5=C6=F7=D6=
=D0=B2=C9=D3=C3=C1=CB=BC=D3=CB=D9=B6=C8=B4=AB=B8=D0=C6=F7, =
=CD=A8=B9=FD=C7=E3=D0=B1=BA=CD=D7=D4=D3=C9=CF=C2=C2=E4=BC=EC=B2=E2=CA=B5=CF=
=D6=C1=CB=B9=F6=B6=AF=B2=CB=B5=A5=B5=C4=B9=A6=C4=DC, =
=C7=EB=D7=F6=CF=EA=CF=B8=BD=E9=C9=DC?</TD></TR>
              <TR>
                <TD bgColor=3D#ffffff>[ =B4=F0=B0=B8 39 ]</TD>
                <TD colSpan=3D2>There is detailed information on the =
application=20
                  notes: AN3107 and AN1986 which are available on =
Freescale=20
                  website. </TD></TR>
              <TR>
                <TD bgColor=3D#b0d7b8>[ =CE=CA=CC=E2 40 ]</TD>
                <TD bgColor=3D#b0d7b8 =
colSpan=3D2>=BC=D3=CB=D9=B6=C8=B4=AB=B8=D0=C6=F7=B5=C4=B8=D0=D3=A6=CF=C2=CF=
=DE=CA=C7=B6=E0=C9=D9?</TD></TR>
              <TR>
                <TD bgColor=3D#ffffff>[ =B4=F0=B0=B8 40 ]</TD>
                <TD colSpan=3D2>There is no under limit for =
accelerometer.=20
</TD></TR>
              <TR>
                <TD bgColor=3D#c6d7ef>[ =CE=CA=CC=E2 41 ]</TD>
                <TD bgColor=3D#c6d7ef colSpan=3D2>MMA7260Q=20
                =
=BC=D3=CB=D9=B6=C8=B4=AB=B8=D0=C6=F7=CB=E6=BC=D3=CB=D9=B6=C8=BA=CD=B5=E7=D4=
=B4=B5=E7=D1=B9=B5=C4=CF=DF=D0=D4=D0=D4=C4=DC=C8=E7=BA=CE?</TD></TR>
              <TR>
                <TD bgColor=3D#ffffff>[ =B4=F0=B0=B8 41 ]</TD>
                <TD colSpan=3D2>There is temperature compensation =
circuits in=20
                  Freescale accelerometer. So the output linearity is =
good. </TD>
              <TR>
                <TD bgColor=3D#b0d7b8>[ =CE=CA=CC=E2 42 ]</TD>
                <TD bgColor=3D#b0d7b8 =
colSpan=3D2>=C7=EB=CE=CA=BC=D3=CB=D9=B6=C8=BC=C6=B5=C4=B4=F8=BF=ED=CA=C7=D6=
=B8 C-V Convertor=20
                  =
=B5=C4=B2=C9=D1=F9=CB=D9=C2=CA=BB=B9=CA=C7=D7=EE=D6=D5=CA=E4=B3=F6=C4=A3=C4=
=E2=D0=C5=BA=C5=B5=C4=B2=C9=D1=F9=CB=D9=C2=CA?</TD></TR>
              <TR>
                <TD bgColor=3D#ffffff>[ =B4=F0=B0=B8 42 ]</TD>
                <TD colSpan=3D2>There is an internal low pass filter =
that shapes=20
                  the bandwidth response to 350Hz for X axis; Y axis and =

                  150Hz-200Hz for Z axis. Then this might be impaired by =
the=20
                  external loading from your filtering caps or ADC. So =
it=20
                  depends where the bottleneck is with respect to =
loading on our=20
                  device. </TD></TR>
              <TR>
                <TD bgColor=3D#c6d7ef>[ =CE=CA=CC=E2 43 ]</TD>
                <TD bgColor=3D#c6d7ef =
colSpan=3D2>=C8=FD=D6=E1=BC=D3=CB=D9=BC=C6=D3=D0=CA=FD=D7=D3=CA=E4=B3=F6=B5=
=C4=C2=F0? =
=C8=E7=B9=FB=C3=BB=D3=D0=C4=DC=B7=F1=D7=F6=B5=BD=CA=FD=D7=D6=CA=E4=B3=F6,=
=20
                  =B4=F3=D4=BC=CA=B1=BC=E4=D2=AA=B6=E0=BE=C3. =
=CF=D6=D3=D0=B2=FA=C6=B7=D6=BB=D3=D0 IIC =BD=D3=BF=DA, =B6=F8 MMA7260Q =
=D6=BB=D3=D0=C4=A3=C4=E2=CA=E4=B3=F6, =D4=DA=B2=BB=D3=C3=D3=D0 AD =
=D7=AA=BB=BB=B5=C4 MCU =CA=B1,=20
                  =
=D3=D0=C3=BB=D3=D0=C6=E4=CB=FC=B0=EC=B7=A8=BF=C9=D2=D4=BD=E2=BE=F6? =
</TD></TR>
              <TR>
                <TD bgColor=3D#ffffff>[ =B4=F0=B0=B8 43 ]</TD>
                <TD colSpan=3D2>We do not have digital output at moment. =
</TD></TR>
              <TR>
                <TD bgColor=3D#b0d7b8>[ =CE=CA=CC=E2 44 ]</TD>
                <TD bgColor=3D#b0d7b8 =
colSpan=3D2>=BC=D3=CB=D9=B6=C8=B4=AB=B8=D0=C6=F7=BF=C9=B7=F1=D3=A6=D3=C3=D4=
=DA=D2=BA=CC=E5=C1=F7=C1=BF=BF=D8=D6=C6=D6=D0?</TD></TR>
              <TR>
                <TD bgColor=3D#ffffff>[ =B4=F0=B0=B8 44 ]</TD>
                <TD colSpan=3D2>We have not experimented with this but =
asuming=20
                  that you have the device well protected from water, it =
can=20
                  work fine. But then it depends on what you are trying =
to=20
                  achieve. And relative fluid viscosity needs to be =
taken into=20
                  account. Other than this we have no further inputs. =
</TD></TR>
              <TR>
                <TD bgColor=3D#c6d7ef>[ =CE=CA=CC=E2 45 ]</TD>
                <TD bgColor=3D#c6d7ef =
colSpan=3D2>=B6=D4=D3=DA=BC=D3=CB=D9=B6=C8=B2=BB=CE=C8=B6=A8=B5=C4=B2=E2=C1=
=BF=D3=D0=D7=D4=B6=AF=B5=F7=BD=DA=C3=B4?=BE=CD=CA=C7=BB=E1=B2=BB=BB=E1=B8=
=F9=BE=DD G=20
                  =
=D6=B5=B1=E4=BB=AF=D7=D4=B6=AF=B5=F7=BD=DA?=BB=B9=CA=C7=D0=E8=D2=AA MCU =
=B5=F7=BD=DA?</TD></TR>
              <TR>
                <TD bgColor=3D#ffffff>[ =B4=F0=B0=B8 45 ]</TD>
                <TD colSpan=3D2>Yes, according to different G-level to =
adjust=20
                  G-select pin by MCU. </TD></TR>
              <TR>
                <TD bgColor=3D#b0d7b8>[ =CE=CA=CC=E2 46 ]</TD>
                <TD bgColor=3D#b0d7b8 =
colSpan=3D2>=B7=C9=CB=BC=BF=A8=B6=FB=BC=D3=CB=D9=B4=AB=B8=D0=C6=F7=CA=F4=D3=
=DA=20
                  =
MEMS=A3=A8=CE=A2=BB=FA=D0=B5=B5=E7=D7=D3=CF=B5=CD=B3=A3=A9=C6=F7=BC=FE=C3=
=B4?=BC=D2=B5=E7=D0=D0=D2=B5=D3=D0=CA=B2=C3=B4=D3=A6=D3=C3?</TD></TR>
              <TR>
                <TD bgColor=3D#ffffff>[ =B4=F0=B0=B8 46 ]</TD>
                <TD colSpan=3D2>Yes, the accelerometer is MEMS device. =
It can be=20
                  used in washing machine to detect motor vibration for =
safety=20
                  control. </TD></TR>
              <TR>
                <TD bgColor=3D#c6d7ef>[ =CE=CA=CC=E2 47 ]</TD>
                <TD bgColor=3D#c6d7ef =
colSpan=3D2>=D5=E2=B8=F6=B2=FA=C6=B7=CA=C7=B7=F1=BF=C9=D2=D4=D3=C3=D3=DA=CA=
=D6=BB=FA, =
=D7=F7=D2=BB=D0=A9=D3=CE=CF=B7=B7=BD=C3=E6=B5=C4=D3=A6=D3=C3?</TD></TR>
              <TR>
                <TD bgColor=3D#ffffff>[ =B4=F0=B0=B8 47 ]</TD>
                <TD colSpan=3D2>Yes. MMA7260Q has high sensitivity. It =
is good=20
                  for hand held game application. Because hand held =
devices, LCD=20
                  can move very fast otherwise user will not able to see =
the=20
                  image from LCD clearly due to shaking. So high =
sensitivity is=20
                  necessary in many games which use tilt. </TD></TR>
              <TR>
                <TD bgColor=3D#b0d7b8>[ =CE=CA=CC=E2 48 ]</TD>
                <TD bgColor=3D#b0d7b8 =
colSpan=3D2>=D2=BB=B0=E3=C0=B4=CB=B5, =
=BC=D3=CB=D9=B6=C8=B4=AB=B8=D0=C6=F7=B6=D4=B5=E7=D4=B4=B5=C4=B2=A8=CE=C6=D2=
=AA=C7=F3=B8=DF=C2=F0?</TD></TR>
              <TR>
                <TD bgColor=3D#ffffff>[ =B4=F0=B0=B8 48 ]</TD>
                <TD colSpan=3D2>Yes. Power suply must be clean. =
</TD></TR>
              <TR>
                <TD bgColor=3D#c6d7ef>[ =CE=CA=CC=E2 49 ]</TD>
                <TD bgColor=3D#c6d7ef colSpan=3D2>=D4=DA =
"=B3=B5=D4=D8=D4=CB=B6=AF=D6=D0=CE=C0=D0=C7=CD=A8=D0=C5"=20
                  =
=CF=B5=CD=B3=C0=EF=A3=AC=B7=C9=CB=BC=BF=A8=B6=FB=BC=D3=CB=D9=B4=AB=B8=D0=C6=
=F7=CA=C7=B7=F1=BE=DF=D3=D0=D3=A6=D3=C3=BC=DB=D6=B5?</TD></TR>
              <TR>
                <TD bgColor=3D#ffffff>[ =B4=F0=B0=B8 49 ]</TD>
                <TD colSpan=3D2>Yes. We have some customers use =
Freescale=20
                  accelerometers in this application. </TD></TR>
              <TR>
                <TD bgColor=3D#b0d7b8>[ =CE=CA=CC=E2 50 ]</TD>
                <TD bgColor=3D#b0d7b8 =
colSpan=3D2>=B5=CD=D6=D8=C1=A6=BC=D3=CB=D9=B6=C8=B4=AB=B8=D0=C6=F7=D6=F7=D2=
=AA=D3=C3=D3=DA=C4=C4=C0=EF?</TD></TR>
              <TR>
                <TD bgColor=3D#ffffff>[ =B4=F0=B0=B8 50 ]</TD>
                <TD colSpan=3D2>Pls access Freescale sensor website to =
get=20
                  detailed application from MMA7260Q factsheet. <A=20
                  =
href=3D"http://www.freescale.com.cn/Products/sensors/MMA7260Q_Overview.as=
p"=20
                  =
target=3D_blank>http://www.freescale.com.cn/Products/sensors/MMA7260Q_Ove=
rview.asp</A>=20
                </TD></TR>
              <TR>
                <TD bgColor=3D#c6d7ef>[ =CE=CA=CC=E2 51 ]</TD>
                <TD bgColor=3D#c6d7ef colSpan=3D2>2 =
=D6=E1=BC=D3=CB=D9=B6=C8=B4=AB=B8=D0=C6=F7=C8=E7=BA=CE=CF=FB=B3=FD=BB=FA=D0=
=B5=B0=B2=D7=B0=B2=FA=C9=FA=B5=C4=B7=BD=CF=F2=D0=D4=CE=F3=B2=EE=20
                  =
(=D0=BE=C6=AC=BA=B8=BD=D3=B2=BB=CD=EA=B3=C9=C6=BD=D0=D0=D3=DA PCB=A3=AC =
=D0=BE=C6=AC=B7=BD=CF=F2=D3=DA=D2=C7=C6=F7=CD=E2=BF=C7=B1=EA=D7=A1=BC=C7=B7=
=BD=CF=F2=BC=E4=CE=F3=B2=EE)? =
=D5=E2=B8=F6=CE=F3=B2=EE=C4=DC=B7=F1=BC=C6=CB=E3=B3=F6=C0=B4?</TD></TR>
              <TR>
                <TD bgColor=3D#ffffff>[ =B4=F0=B0=B8 51 ]</TD>
                <TD colSpan=3D2>You need to refer to our application =
note=20
                  (AN3107). Basically you need to detemine the reference =
point=20
                  for which the sensor is mounted. To obtain the most =
resolution=20
                  per degree of change, the IC should be mounted with =
the=20
                  sensitive axis parallel to the plane of movement where =
the=20
                  most sensitivity is desired. For example, if the =
degree range=20
                  that an application will be measuring is only 0=A1=E3 =
to 45=A1=E3 and=20
                  the PCB will be mounted perpendicular to gravity, then =
an=20
                  X-Axis device would be used. With this then your =
reference=20
                  point is the initial mounting of the device and your =
reference=20
                  angle would be the cosine of that sensor axis to =
gravity. Yes=20
                  you can determine the error by taking one measurement =
with one=20
                  A/D step change at various points of your scale (ie 0 =
degree,=20
                  +90 degree etc). </TD></TR>
              <TR>
                <TD bgColor=3D#b0d7b8>[ =CE=CA=CC=E2 52 ]</TD>
                <TD bgColor=3D#b0d7b8 colSpan=3D2>MMA7260Q =
=B5=C4=C4=DA=B2=BF=B2=C9=D1=F9=C2=CA=CA=C7 11KHZ, =
=CA=C7=B2=BB=CA=C7=CB=B5 A/D=20
                  =
=B2=C9=D1=F9=C2=CA=CC=AB=B5=CD=BE=CD=BB=E1=D3=B0=CF=EC=C4=DA=B2=BF=B2=C9=D1=
=F9?</TD></TR>
              <TR>
                <TD bgColor=3D#ffffff>[ =B4=F0=B0=B8 52 ]</TD>
                <TD =
colSpan=3D2>=B2=BB=CA=C7=A1=A3=C4=DA=B2=BF=B2=C9=D1=F9=CA=C7=B9=CC=B6=A8=B5=
=C4=A1=A3 </TD></TR>
              <TR>
                <TD bgColor=3D#c6d7ef>[ =CE=CA=CC=E2 53 ]</TD>
                <TD bgColor=3D#c6d7ef =
colSpan=3D2>=D3=B2=C5=CC=C4=DA=D6=C3=BC=D3=CB=D9=C6=F7=B4=AB=B8=D0=C6=F7=C0=
=B4=B1=A3=BB=A4=D3=B2=C5=CC=CA=C7=D4=F5=C3=B4=BB=D8=CA=C2?</TD></TR>
              <TR>
                <TD bgColor=3D#ffffff>[ =B4=F0=B0=B8 53 ]</TD>
                <TD =
colSpan=3D2>=B5=B1=D3=B2=C5=CC=B2=BB=C9=F7=B5=F4=C2=E4=CA=B1, =
=BC=D3=CB=D9=C6=F7=B4=AB=B8=D0=C6=F7=BB=E1=D5=EC=B2=E9=B5=BD=B6=F8=BD=AB=D3=
=B2=C5=CC=B5=C4=D6=B8=D5=EB=BB=D8=B5=BD=D4=AD=B1=BE=CE=BB=D6=C3=D2=D4=B1=DC=
=C3=E2=D6=B8=D5=EB=B9=CE=C9=CB=B5=BD=D3=B2=C5=CC=B5=C4=B4=C5=B5=C0 =
=A1=A3=20
                </TD></TR>
              <TR>
                <TD bgColor=3D#b0d7b8>[ =CE=CA=CC=E2 54 ]</TD>
                <TD bgColor=3D#b0d7b8=20