MMA3202EG Freescale, MMA3202EG Datasheet - Page 5

• Manufacturer Part Number: MMA3202EG
• Manufacturer: Freescale

Specifications of MMA3202EG

• Family Name: MMA3202
• Package Type: SOIC W
• Operating Supply Voltage (min): 4.75V
• Operating Supply Voltage (typ): 5V
• Operating Supply Voltage (max): 5.25V
• Operating Temperature (min): -40C
• Operating Temperature (max): 125C
• Operating Temperature Classification: Automotive
• Product Height (mm): 3.3mm
• Mounting: Surface Mount
• Pin Count: 20
• Lead Free Status / RoHS Status: Compliant

Sensors
Freescale Semiconductor
PINOUT DESCRIPTION
Table 3. Pin Descriptions
12 thru 16
17 thru 19
Pin No.
1 thru 3
Figure 4. SOIC Accelerometer with Recommended
V
DD
10
11
20
4
5
6
7
8
9
0.1 μF
C1
STATUS
Logic
Input
AV
X
N/C
N/C
V
N/C
N/C
OUT
V
Pin Name
ST
STATUS
DD
DD
SS
AV
X
Y
GND
V
V
ST
—
—
OUT
OUT
—
—
DD
SS
DD
10
5
8
9
Connection Diagram
1
2
3
4
5
6
7
8
9
10
ST
V
AV
V
DD
SS
Leave unconnected.
No internal connection. Leave
unconnected.
Logic input pin used to initiate self-test.
Output voltage of the accelerometer. X
Direction.
Logic output pin to indicate fault.
The power supply ground.
The power supply input.
Power supply input (Analog).
Output voltage of the accelerometer. Y
Direction.
Used for factory trim. Leave
unconnected.
No internal connection. Leave
unconnected.
Ground.
DD
MMA3202KEG
X
Y
OUT
OUT
20
19
18
17
16
15
14
13
12
11
Description
7
6
11
0.01 μF
0.01 μF
C2
C3
1 kΩ
GND
N/C
N/C
N/C
N/C
N/C
N/C
N/C
N/C
Y
1 kΩ
R1
R2
OUT
BASIC CONNECTIONS
Status
X Output
Signal
Y Output
Signal
PCB Layout
NOTE:
•
•
•
•
•
•
•
Figure 5. Recommended PCB Layout for Interfacing
Use a 0.1 μF capacitor on V
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 in
Use an RC filter of 1 kΩ and 0.01 μF on the output of the
accelerometer to minimize clock noise (from the switched
capacitor filter circuit).
PCB layout of power and ground should not couple power
supply noise.
Accelerometer and microcontroller should not be a high
current path.
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.
STATUS
X
Y
V
OUT
OUT
V
ST
DD
SS
Accelerometer to Microcontroller
C
Power Supply
0.1 μF
1 kΩ
1 kΩ
R
R
C
C
C
0.01 μF
0.01 μF
0.1 μF
DD
P1
P0
A/D In
A/D In
V
RH
to decouple the power
Figure
V
V
SS
DD
MMA3202KEG
5.
C
0.1 μF
5