加速传感器(mma7260q)在线座谈和常见问题解答.mht

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                <TD bgColor=3D#c6d7ef>[ =CE=CA=CC=E2 17 ]</TD>
                <TD bgColor=3D#c6d7ef=20
              =
colSpan=3D2>=C6=E6=C3=EE=B5=C4=B7=C9=CB=BC=BF=A8=B6=FB=BC=D3=CB=D9=B4=AB=B8=
=D0=C6=F7=D4=DA=B6=E0=C3=BD=CC=E5=B5=E7=D7=D3=B2=FA=C6=B7=B7=BD=C3=E6=D3=D0=
=C4=C4=D0=A9=BE=DF=CC=E5=D3=C3=CD=BE?</TD></TR>
              <TR>
                <TD bgColor=3D#ffffff>[ =B4=F0=B0=B8 17 ]</TD>
                <TD colSpan=3D2>It can use for HDD freefall detection,=20
                  menu-scrolling, power-saving, stolen alarm, tilt =
detection and=20
                  pattern recognition. </TD></TR>
              <TR>
                <TD bgColor=3D#b0d7b8>[ =CE=CA=CC=E2 18 ]</TD>
                <TD bgColor=3D#b0d7b8 =
colSpan=3D2>=BC=D3=CB=D9=B4=AB=B8=D0=C6=F7=D4=DA=BB=B7=BE=B3=B2=E2=C1=BF=D6=
=D0=BB=E1=D3=D0=CA=B2=C3=B4=D3=A6=D3=C3=C4=D8?</TD></TR>
              <TR>
                <TD bgColor=3D#ffffff>[ =B4=F0=B0=B8 18 ]</TD>
                <TD colSpan=3D2>It can detect bridge or dam for =
vibration or=20
                  tilt angle monitoring. </TD></TR>
              <TR>
                <TD bgColor=3D#c6d7ef>[ =CE=CA=CC=E2 19 ]</TD>
                <TD bgColor=3D#c6d7ef =
colSpan=3D2>=B8=C3=BC=D3=CB=D9=B4=AB=B8=D0=C6=F7=D6=A7=B3=D6=C8=FD=CE=AC=B8=
=D0=D3=A6=C2=F0?</TD></TR>
              <TR>
                <TD bgColor=3D#ffffff>[ =B4=F0=B0=B8 19 ]</TD>
                <TD colSpan=3D2>MMA7260Q can support 3-axes acceleration =

                  detection with only one chip. </A></TD></TR>
              <TR>
                <TD bgColor=3D#b0d7b8>[ =CE=CA=CC=E2 20 ]</TD>
                <TD bgColor=3D#b0d7b8 =
colSpan=3D2>=D7=F7=C7=E3=D0=B1=BD=C7=B2=E2=C1=BF=CA=B1=A3=AC=C8=F4=CE=EF=CC=
=E5=C7=E3=D0=B1=BA=F3=BE=B2=D6=B9=A3=AC=B4=CB=CA=B1=CB=F9=D3=D0=CA=E4=B3=F6=
=CA=C7=B7=F1=BE=F9=CE=AA0?=20
              </TD></TR>
              <TR>
                <TD bgColor=3D#ffffff>[ =B4=F0=B0=B8 20 ]</TD>
                <TD colSpan=3D2>No because you will always have a =
measure of=20
                  gravity acting on it (ie the cosine of the angle x g). =
</TD></TR>
              <TR>
                <TD bgColor=3D#c6d7ef>[ =CE=CA=CC=E2 21 ]</TD>
                <TD bgColor=3D#c6d7ef =
colSpan=3D2>=C7=EB=CE=CA=B7=C9=CB=BC=BF=A8=B6=FB=CA=C7=B7=F1=D3=D0=CE=BB=D2=
=C6=B4=AB=B8=D0=C6=F7=BB=F2=CB=D9=B6=C8=B4=AB=B8=D0=C6=F7=D6=AE=C0=E0=B5=C4=
=B2=FA=C6=B7?</TD></TR>
              <TR>
                <TD bgColor=3D#ffffff>[ =B4=F0=B0=B8 21 ]</TD>
                <TD colSpan=3D2>No. </TD></TR>
              <TR>
                <TD bgColor=3D#b0d7b8>[ =CE=CA=CC=E2 22 ]</TD>
                <TD bgColor=3D#b0d7b8 =
colSpan=3D2>=B7=C9=CB=BC=BF=A8=B6=FB=D3=D0=C3=BB=D3=D0=BB=F9=D3=DA MEMS =
=BC=BC=CA=F5=B5=C4=CE=AA=CE=A2=D1=B9=C1=A6=B4=AB=B8=D0=C6=F7=A3=AC=B7=D6=B1=
=E6=C2=CA=B4=EF=B5=BD=20
                  0.5g =
=BB=F2=B8=FC=BE=AB=B6=C8=B8=FC=B8=DF=B5=C4?</TD></TR>
              <TR>
                <TD bgColor=3D#ffffff>[ =B4=F0=B0=B8 22 ]</TD>
                <TD colSpan=3D2>Our accelerometers are for acceleration=20
                  measurements and not for pressure. Our full span is =
+/-1.5g.=20
                  If you want 0.5g then our sensor can still detect =
this. </TD></TR>
              <TR>
                <TD bgColor=3D#c6d7ef>[ =CE=CA=CC=E2 23 ]</TD>
                <TD bgColor=3D#c6d7ef =
colSpan=3D2>=C7=EB=CE=CA=B7=C9=CB=BC=BF=A8=B6=FB=BC=D3=CB=D9=B4=AB=B8=D0=C6=
=F7=B5=C4=C6=B5=CF=EC=B7=B6=CE=A7=CA=C7=B6=E0=C9=D9?=20
              =D7=EE=B5=CD=C6=B5=CF=EC=CA=C7=B6=E0=C9=D9?</TD></TR>
              <TR>
                <TD bgColor=3D#ffffff>[ =B4=F0=B0=B8 23 ]</TD>
                <TD colSpan=3D2>Our accelerometers range from dc to =
350Hz for X=20
                  and Y axis and around 200Hz for Z axis. The minimum =
frequency=20
                  response depends on the loading of the low pass filter =
or the=20
                  A/D converter that is connected to it. Pls refer to =
Freescale=20
                  MMA7260Q datasheets. </TD></TR>
              <TR>
                <TD bgColor=3D#b0d7b8>[ =CE=CA=CC=E2 24 ]</TD>
                <TD bgColor=3D#b0d7b8 =
colSpan=3D2>=B4=AB=B8=D0=C6=F7=B5=C4=BE=AB=B6=C8=C8=E7=BA=CE?=C7=E3=BD=C7=
=C4=DC=B4=EF=B5=BD=B6=E0=C9=D9=BE=AB=B6=C8?</TD></TR>
              <TR>
                <TD bgColor=3D#ffffff>[ =B4=F0=B0=B8 24 ]</TD>
                <TD colSpan=3D2>Our accelerometers do not have an non =
linear=20
                  response. The tilt accuracy depends on a number of =
things:=20
                  <BR>a. Noise level of your system <BR>b. Sensitivity =
of device=20
                  selected <BR>c. A/D resolution <BR>d. What area of the =

                  response curve are you in with the angle of interests. =
<BR>To=20
                  give you an idea, our MMA6260 device with sensitivity =
of=20
                  0.8V/g and using an A/D of 10bit will give accuracy of =
0.229=20
                  at 0 degrees (highest sensitivity point of the =
response). This=20
                  will improved with increased A/D resolutions. =
</TD></TR>
              <TR>
                <TD bgColor=3D#c6d7ef>[ =CE=CA=CC=E2 25 ]</TD>
                <TD bgColor=3D#c6d7ef colSpan=3D2>a.=20
                  =
=D3=C9=BC=D3=CB=D9=B6=C8=D6=B5=BB=FD=B7=D6=C7=F3=CB=D9=B6=C8=A1=A2=CE=BB=D2=
=C6=A3=AC=C0=DB=BC=C6=CE=F3=B2=EE=C8=E7=BA=CE=BF=BC=C2=C7=A3=AC=B4=F3=D6=C2=
=B7=B6=CE=A7=B6=E0=B4=F3=A3=AC=D3=D0=CE=DE=CA=D4=D1=E9=BD=E1=B9=FB? =
<BR>b.=20
                  =
=B7=C9=CB=BC=BF=A8=B6=FB=CC=E1=B9=A9=B5=C4=BC=D3=CB=D9=B6=C8=B4=AB=B8=D0=C6=
=F7=C6=B5=CF=EC=CC=D8=D0=D4=C8=E7=BA=CE?=C6=B5=B4=F8=BF=ED=B6=C8?</TD></T=
R>
              <TR>
                <TD bgColor=3D#ffffff>[ =B4=F0=B0=B8 25 ]</TD>
                <TD colSpan=3D2>Our sensor is able to measure =
acceleration=20
                  within good accuracy +/-7.5%. But to integrate with =
time,=20
                  errors will accumulate and one needs to like at the =
initial=20
                  raw data and determine what is needed before =
processing. So=20
                  the answer depends on how accurate have you capture =
the raw=20
                  data and it would be expected that the user knows what =
is=20
                  going on with the exact movement of the sensor. =
Unfortunately,=20
                  we do not have analysis done for position with respect =
to=20
                  accuracy because this is highly dependent on the =
degree of=20
                  data capturing and algorthim used. </TD></TR>
              <TR>
                <TD bgColor=3D#b0d7b8>[ =CE=CA=CC=E2 26 ]</TD>
                <TD bgColor=3D#b0d7b8 =
colSpan=3D2>=B4=F3=D0=A1=C8=E7=BA=CE=A3=AC=C1=E9=C3=F4=B6=C8=C8=E7=BA=CE?=
</TD></TR>
              <TR>
                <TD bgColor=3D#ffffff>[ =B4=F0=B0=B8 26 ]</TD>
                <TD colSpan=3D2>Our size is 6x6x1.45mm in size for our =
tri-axis=20
                  sensor. Our sensor is able to measure acceleration =
within good=20
                  accuracy +/-7.5% for a fullscale span of 2g. This will =
go up=20
                  significantly for very high g range devices. =
</TD></TR>
              <TR>
                <TD bgColor=3D#c6d7ef>[ =CE=CA=CC=E2 27 ]</TD>
                <TD bgColor=3D#c6d7ef =
colSpan=3D2>=C7=EB=CE=CA=C6=FB=B3=B5=B2=E0=CF=F2=BC=D3=CB=D9=B6=C8=B5=C4=B2=
=E2=C1=BF=B2=C9=D3=C3=CA=B2=C3=B4=D0=CD=BA=C5=B5=C4=B4=AB=B8=D0=C6=F7? =
</TD></TR>
              <TR>
                <TD bgColor=3D#ffffff>[ =B4=F0=B0=B8 27 ]</TD>
                <TD colSpan=3D2>Part No. as MMA2260D. </TD></TR>
              <TR>
                <TD bgColor=3D#b0d7b8>[ =CE=CA=CC=E2 28 ]</TD>
                <TD bgColor=3D#b0d7b8 colSpan=3D2>=C7=EB=BD=E9=C9=DC =
MMA7260Q =
=BC=D3=CB=D9=B6=C8=B4=AB=B8=D0=C6=F7=B5=C4=CA=E4=B3=F6=D0=D4=C4=DC, =
=C4=DC=B7=F1=D6=B1=BD=D3=BA=CD=20
                  ADC =CF=E0=C1=AC=BD=D3?</TD></TR>
              <TR>
                <TD bgColor=3D#ffffff>[ =B4=F0=B0=B8 28 ]</TD>
                <TD colSpan=3D2>Please refer MMA7260Q datasheet which =
can down=20
                  loaded from Freescale Sensor website. Yes, it can =
connect to=20
                  ADC directly. </TD></TR>
              <TR>
                <TD bgColor=3D#c6d7ef>[ =CE=CA=CC=E2 29 ]</TD>
                <TD bgColor=3D#c6d7ef =
colSpan=3D2>=BF=C9=D2=D4=CC=E1=B9=A9=B7=BD=B0=B8=C3=B4? =
=CE=D2=B9=AB=CB=BE=C6=B7=CF=EB=B2=E2=C1=BF=BD=C7=B6=C8,=20
              =CA=C7=B7=F1=C4=DC=C5=C9=C9=CF=D3=C3=B3=A1?</TD></TR>
              <TR>
                <TD bgColor=3D#ffffff>[ =B4=F0=B0=B8 29 ]</TD>
                <TD colSpan=3D2>Pls refer to our application note =
(AN3107). We=20
                  have methods for doing tilt measurements. </TD></TR>
              <TR>
                <TD bgColor=3D#b0d7b8>[ =CE=CA=CC=E2 30 ]</TD>
                <TD bgColor=3D#b0d7b8 colSpan=3D2>=C7=EB=BD=E9=C9=DC =
MMA7260Q =
=BC=D3=CB=D9=B6=C8=B4=AB=B8=D0=C6=F7=C4=DA=B2=BF=C2=CB=B2=A8=C6=F7=B5=C4=D0=
=D4=C4=DC,=20
                  =
=CB=FC=B5=C4=BD=D8=D6=B9=C6=B5=C2=CA=D3=D0=B6=E0=B8=DF?</TD></TR>
              <TR>
                <TD bgColor=3D#ffffff>[ =B4=F0=B0=B8 30 ]</TD>
                <TD colSpan=3D2>Sensing element resonant frenqency XY at =
6kHz, Z=20
                  at 3.4kHz. Bandwidth response XY at 350Hz, Z at 150Hz. =
</TD></TR>
              <TR>
                <TD bgColor=3D#c6d7ef>[ =CE=CA=CC=E2 31 ]</TD>
                <TD bgColor=3D#c6d7ef =
colSpan=3D2>=C7=EB=CE=CA=CD=D3=C2=DD=B4=AB=B8=D0=C6=F7=A1=A2=CB=D9=B6=C8=B4=
=AB=B8=D0=C6=F7=BA=CD=BC=D3=CB=D9=B4=AB=B8=D0=C6=F7=B5=C4=C7=F8=B1=F0?</T=
D></TR>
              <TR>
                <TD bgColor=3D#ffffff>[ =B4=F0=B0=B8 31 ]</TD>
                <TD colSpan=3D2>The accelerometer can use to detect =
linear=20
                  acceleration. However, the gyro is used to detect =
angular=20
                  acceleration. </TD></TR>
              <TR>
                <TD bgColor=3D#b0d7b8>[ =CE=CA=CC=E2 32 ]</TD>
                <TD bgColor=3D#b0d7b8 =
colSpan=3D2>=C4=DC=B7=F1=CC=E1=B9=A9=D3=A6=D3=C3=B5=E7=C2=B7? =
=CA=C7=B2=C9=D3=C3=C4=C7=D6=D6=F1=EE=BA=CF=B7=BD=CA=BD?=20
                =
=C8=E7=BA=CE=BD=F8=D0=D0=C3=F4=B8=D0=D6=E1=D0=A3=D7=BC?</TD></TR>
              <TR>
                <TD bgColor=3D#ffffff>[ =B4=F0=B0=B8 32 ]</TD>
                <TD colSpan=3D2>The accelerometer datasheet provides =
application=20
                  circuits. The sensor output is series 1K ohms resistor =
to MCU=20
                  A/D pin. There is detailed information about =
calibration on=20
                  the application note (AN1986) which is available on =
Freescale=20
                  website. </TD></TR>
              <TR>
                <TD bgColor=3D#c6d7ef>[ =CE=CA=CC=E2 33 ]</TD>
                <TD bgColor=3D#c6d7ef colSpan=3D2>MMA1260 =D3=EB MMA6260 =

              =
=B5=C4=B2=C9=D1=F9=C2=CA=B7=D6=B1=F0=CA=C7=B6=E0=C9=D9?</TD></TR>
              <TR>
                <TD bgColor=3D#ffffff>[ =B4=F0=B0=B8 33 ]</TD>
                <TD colSpan=3D2>The bandwidth response is 50Hz for the =
two=20
                  chips. </TD></TR>
              <TR>
                <TD bgColor=3D#b0d7b8>[ =CE=CA=CC=E2 34 ]</TD>
                <TD bgColor=3D#b0d7b8=20
                  =
colSpan=3D2>=C4=BF=C7=B0=CA=D0=B3=A1=C9=CF=D3=D0=B6=E0=D6=D6=C0=E0=D0=CD=B5=
=C4=BC=D3=CB=D9=B6=C8=B4=AB=B8=D0=C6=F7=B2=FA=C6=B7=A3=AC=D3=D0=B5=C4=CA=C7=
=BB=F9=D3=DA=D1=B9=B5=E7=BE=A7=CC=E5=A3=AC=D3=D0=B5=C4=D4=F2=BB=F9=D3=DA=B5=
=E7=C8=DD=A1=A2=B5=E7=D7=E8=D3=A6=B1=E4=C6=AC=B5=C8=A1=A3=C7=EB=CE=CA=D0=BE=
=C6=AC=BB=AF=B5=C4=BC=D3=CB=D9=B6=C8=B4=AB=B8=D0=C6=F7=D3=EB=D5=E2=D0=A9=B4=
=AB=CD=B3=B5=C4=BC=D3=CB=D9=B4=AB=B8=D0=C6=F7=CF=E0=B1=C8=A3=AC=D3=D0=CA=B2=
=C3=B4=D1=F9=B5=C4=CC=D8=B5=E3?</TD></TR>
              <TR>
                <TD bgColor=3D#ffffff>[ =B4=F0=B0=B8 34 ]</TD>
                <TD colSpan=3D2>The benefit to use silicon device is to =
save=20
                  power consumption, increase reliability, digital data =
to=20
                  analyze and save system design PCB space. </TD></TR>
              <TR>
                <TD bgColor=3D#c6d7ef>[ =CE=CA=CC=E2 35 ]</TD>
                <TD bgColor=3D#c6d7ef =
colSpan=3D2>=BC=D3=CB=D9=B6=C8=D0=BE=C6=AC=B6=D4=BA=B8=BD=D3=A1=A2=B0=B2=D7=
=B0=D3=D0=CA=B2=C3=B4=CC=D8=CA=E2=D2=AA=C7=F3?</TD></TR>
              <TR>
                <TD bgColor=3D#ffffff>[ =B4=F0=B0=B8 35 ]</TD>
                <TD colSpan=3D2>The detailed information can be found =
from=20
                  application notes: AN1902 and DL200 which are =
available on=20
                  Freescale website. </TD></TR>
              <TR>
                <TD bgColor=3D#b0d7b8>[ =CE=CA=CC=E2 36 ]</TD>
                <TD bgColor=3D#b0d7b8=20
                  =
colSpan=3D2>=CE=D2=CF=EB=D3=C3=D5=E2=B8=F6=D7=F7=D2=BB=B8=F6=B2=E2=C1=BF=C6=
=FB=B3=B5=D0=D0=CA=BB=BC=D3=CB=D9=B5=C2=B5=C4=D7=B0=D6=C3=A3=AC=CD=A8=B9=FD=
=BB=FD=B7=D6=C0=B4=CA=B5=CF=D6=C6=FB=B3=B5=D0=D0=CA=BB=CB=D9=B6=C8=B2=E2=C1=
=BF=A3=AC=C7=EB=CE=CA=C0=DB=BB=FD=CE=F3=B2=EE=BB=E1=D4=DA=D4=CA=D0=ED=B7=B6=
=CE=A7=C4=DA=C2=EB?</TD></TR>
              <TR>