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MMA1260KEG Datasheet(PDF) 5 Page - Freescale Semiconductor, Inc

Part # MMA1260KEG
Description  Low G Micromachined Accelerometer
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Manufacturer  FREESCALE [Freescale Semiconductor, Inc]
Direct Link  http://www.freescale.com
Logo FREESCALE - Freescale Semiconductor, Inc

MMA1260KEG Datasheet(HTML) 5 Page - Freescale Semiconductor, Inc

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MMA1260KEG
Sensors
Freescale Semiconductor
5
BASIC CONNECTIONS
Pinout Description
Figure 5. SOIC Accelerometer with Recommended
Connection Diagram
PCB Layout
Figure 6. Recommended PCB Layout for Interfacing
Accelerometer to Microcontroller
NOTES:
1. Use a 0.1
μF capacitor on VDD to decouple the power
source.
2. Physical coupling distance of the accelerometer to the
microcontroller should be minimal.
3. Place a ground plane beneath the accelerometer to
reduce noise, the ground plane should be attached to
all of the open ended terminals shown in Figure 6.
4. Use an RC filter of 1 k
Ω and 0.1 μF on the output of the
accelerometer to minimize clock noise (from the
switched capacitor filter circuit).
5. PCB layout of power and ground should not couple
power supply noise.
6. Accelerometer and microcontroller should not be a
high current path.
7. A/D sampling rate and any external power supply
switching frequency should be selected such that they
do not interfere with the internal accelerometer
sampling frequency. This will prevent aliasing errors.
Table 3. Pin Descriptions
Pin No.
Pin Name
Description
1 thru 3
VSS
Redundant connections to the internal
VSS and may be left unconnected.
4
VOUT
Output voltage of the accelerometer.
5
STATUS
Logic output pin to indicate fault.
6
VDD
The power supply input.
7
VSS
The power supply ground.
8
ST
Logic input pin used to initiate self-test.
9 thru 13
Trim pins
Used for factory trim. Leave
unconnected.
14 thru 16
No internal connection. Leave
unconnected.
VSS
VSS
VSS
VOUT
STATUS
VDD
VSS
ST
N/C
N/C
N/C
N/C
N/C
N/C
N/C
N/C
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
8
MMA1260KEG
ST
VDD
VSS
VOUT
Output
Signal
R1
1 kΩ
4
C2
0.1 μF
6
7
Logic
Input
VDD
C1
0.1 μF
STATUS
5
3
2
1
VSS
VSS
VSS
P0
A/D In
VRH
VSS
VDD
ST
VOUT
VSS
VDD
0.1 μF
1 kΩ
0.1 μF
0.1 μF
Power Supply
0.1 μF
P1
STATUS
C
C
C
R
C


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