MMA6281QT Freescale, MMA6281QT Datasheet - Page 5

• Manufacturer Part Number: MMA6281QT
• Manufacturer: Freescale

Specifications of MMA6281QT

• Package Type: QFN EP
• Operating Supply Voltage (min): 2.2V
• Operating Supply Voltage (typ): 3.3V
• Operating Supply Voltage (max): 3.6V
• Operating Temperature (min): -40C
• Operating Temperature (max): 105C
• Operating Temperature Classification: Industrial
• Product Depth (mm): 6mm
• Product Height (mm): 1.45mm
• Product Length (mm): 6mm
• Mounting: Surface Mount
• Pin Count: 16
• Lead Free Status / RoHS Status: Compliant

Sensors
Freescale Semiconductor
Pin Descriptions
Table 4. Pin Descriptions
Pin No.
8 - 11
5 - 7
12
13
14
15
16
1
2
3
4
V
Figure 5. Accelerometer with Recommended
DD
0.1 μF
g-Select1
g-Select2
Logic
Input
Sleep Mode
Logic
Inputs
Pin Name
g-Select1
g-Select2
V
V
Figure 4. Pinout Description
DD
Z
X
SS
V
V
N/C
N/C
N/C
N/C
OUT
OUT
DD
SS
2
4
3
1
12
3
4
1
2
g-Select1
g-Select2
Sleep Mode
V
V
16
5
DD
SS
Logic input pin to select g level.
Logic input pin to select g level.
Power Supply Input
Power Supply Ground
No internal connection.
Leave unconnected.
Unused for factory trim.
Leave unconnected.
Logic input pin to enable product or
Sleep Mode.
Z direction output voltage.
No internal connection.
Leave unconnected.
X direction output voltage.
No internal connection.
Leave unconnected.
Top View
MMA6281QT
15
6
14 13
7
Z
X
OUT
OUT
8
Description
11
10
13
15
12
9
0.1 μF
0.1 μF
N/C
Sleep Mode
N/C
N/C
1 kΩ
1 kΩ
BASIC CONNECTIONS
PCB Layout
NOTES:
Figure 6. Recommended PCB Layout for Interfacing
1. Use 0.1 µF capacitor on V
2. Physical coupling distance of the accelerometer to
3. The flag underneath the package is internally
4. Place a ground plane beneath the accelerometer to
5. Use an RC filter with 1.0 kΩ and 0.1 µF on the
6. PCB layout of power and ground should not couple
7. Accelerometer and microcontroller should not be a
8. A/D sampling rate and any external power supply
9. PCB layout should not run traces or vias under the
Sleep Mode
g-Select1
g-Select2
source. Do not exceed capacitor values of 2.2 or
3.3 µF. Slow dV/dt rise times on V
device to not power up below 0
operation below 0
to reach 2.2V in < 0.1 ms as measured on the device
at the V
then the dv/dt at the V
measured.
the microcontroller should be minimal.
connected to ground. It is not recommended for the
flag to be soldered down.
reduce noise, the ground plane should be attached to
all of the open ended terminals shown in
outputs of 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 (11 kHz for the sampling
frequency). This will prevent aliasing errors.
QFN part. This could lead to ground shorting to the
accelerometer flag.
X
Z
V
V
OUT
OUT
DD
Accelerometer to Microcontroller
SS
POWER SUPPLY
DD
C
pin. If output signal does not assert itself,
Connection Diagram
R
R
°
C ensure V
C
C
DD
pin of the device should be
DD
C
C
to decouple the power
DD
°
P2
A/D
A/D
V
P0
P1
C.To ensure
RH
line has the ability
DD
IN
IN
may cause the
MMA6281QT
Figure
V
V
DD
SS
6.
C
C
5