MMA1212EGR2 Freescale Semiconductor, MMA1212EGR2 Datasheet - Page 5

• Manufacturer Part Number: MMA1212EGR2
• Description: IC ACCELEROMETER Z AXIS 16-SOIC
• Manufacturer: Freescale Semiconductor

Specifications of MMA1212EGR2

• Rohs Status: RoHS Compliant
• Axis: Z
• Acceleration Range: ±225g
• Sensitivity: 10mV/g
• Voltage - Supply: 4.75 V ~ 5.25 V
• Output Type: Analog
• Bandwidth: 400Hz
• Mounting Type: Surface Mount
• Package / Case: 16-SOIC (0.300", 7.50mm Width)
• Sensing Axis: Z
• Acceleration: 200 g
• Maximum Operating Temperature: + 125 C
• Minimum Operating Temperature: - 40 C
• Interface: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

Sensors
Freescale Semiconductor
Pinout Description
Table 3. Pin Descriptions
14 thru 16
9 thru 13
V
Pin No.
1 thru 3
DD
Figure 5. SOIC Accelerometer with Recommended
0.1 µF
4
5
6
7
8
C1
Logic
Input
STATUS
Pin Name
Trim pins
STATUS
V
V
N/C
N/C
N/C
V
OUT
V
ST
DD
V
V
SS
ST
—
OUT
—
SS
DD
4
8 V
7
Connection Diagram
V
ST
SS
DD
1
2
3
4
5
6
7
8
MMA1212D
Leave unconnected
Logic input pin used to initiate self-test
Output voltage of the accelerometer
Logic output pin to indicate fault
The power supply ground
The power supply input
Used for factory trim. Leave
unconnected
No internal connection. Leave
unconnected
V
OUT
16
15
14
13
12
11
10
Description
9
6
5
0.01 µF
1 kΩ
C2
R1
N/C
N/C
N/C
N/C
N/C
N/C
N/C
N/C
BASIC CONNECTIONS
STATUS
Output
Signal
PCB Layout
NOTES:
Figure 6. Recommended PCB Layout for Interfacing
1. Use a 0.1 µF capacitor on V
2. Physical coupling distance of the accelerometer to the
3. Place a ground plane beneath the accelerometer to
4. Use an RC filter of 1 kΩ and 0.01 µF on the output of
5. PCB layout of power and ground should not couple
6. Accelerometer and microcontroller should not be a
7. A/D sampling rate and any external power supply
STATUS
source.
microcontroller should be minimal.
reduce noise, the ground plane should be attached to
all of the open ended terminals shown in
the accelerometer to minimize clock noise (from the
switched capacitor filter circuit).
power supply noise.
high current path.
switching frequency should be selected such that they
do not interfere with the internal accelerometer
sampling frequency. This will prevent aliasing errors.
V
OUT
V
V
ST
DD
SS
Accelerometer to Microcontroller
C
Power Supply
0.1 µF
1 kΩ
R R
C
C
0.01 µF
0.1 µF
P1
P0
A/D In
V
RH
DD
to decouple the power
V
V
SS
DD
Figure
MMA1212D
C
0.1 µF
6.
5