XMMA1000P データシートの表示（PDF） - Motorola => Freescale
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XMMA1000P Datasheet PDF : 8 Pages
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XMMA1000P XMMA2000W
BASIC CONNECTIONS
Circuit Schematic
Figure 3 shows the recommended connection diagram for
operating the accelerometer. Figure 3 (a) shows the 16 pin
DIP package version, the XMMA1000P, while (b) shows the
6 pin Wingback package version, the XMMA2000W. For the
XMMA1000P, pins 1, 2, 3, 6, 14, 15, and 16 have no internal
connections, and pins 9 through 13 are used for calibration
and trimming in the factory. These pins should all be con-
nected to VSS, except pin 11 which must be connected to
VDD. For the XMMA2000W, pins 1 and 4, and the wings
(supporting pins) should be connected to VSS.
VDD
LOGIC
INPUT
C1
0.1 µF
XMMA1000P
4 ST
R1
8 VDD
VOUT 5 1 kΩ
11 TRIM 3
7 VSS
C2
0.01 µF
OUTPUT
SIGNAL
(a)
VDD
LOGIC
INPUT
C1
0.1 µF
XMMA2000W
2 ST
6 VDD
R1
VOUT 3 1 kΩ
5 VSS
C2
0.01 µF
OUTPUT
SIGNAL
(b)
Figure 3. Accelerometers with Recommended
Connection Diagram
PCB Layout
ST
P0
VOUT
VSS
VDD
R
A/D IN
1 kΩ C 0.01 µF
C 0.1 µF
VRH
C 0.1 µF
VSS
C 0.1 µF
VDD
POWER SUPPLY
NOTES:
• Use a .1 µF capacitor on VDD to decouple the power source.
• Physical coupling distance of the accelerometer to the
microcontroller should be minimal.
• Place a ground plane beneath the accelerometer to reduce
noise, the ground plane should be attached to all of the
open ended terminals shown above.
• Use independent supply traces for the A/D reference
(microcontroller) and the accelerometer.
• Use an RC filter of 1 kΩ and 0.01 µF on the output of the
accelerometer to minimize induced errors.
• PCB layout of power and ground should not couple power
supply noise.
• Accelerometer and microcontroller should not be a high
current path.
• For ratiometricity purposes the accelerometer VDD and mi-
crocontroller A/D reference pin should be on the same
trace.
• A/D sampling rate and any external power supply switching
frequency should be selected such that they do not inter-
fere with the internal accelerometer sampling frequency.
This will prevent aliasing errors.
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data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including “Typicals”
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