MMA7361LT 데이터 시트보기 (PDF) - Freescale Semiconductor
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MMA7361LT Datasheet PDF : 11 Pages
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BASIC CONNECTIONS
Pin Descriptions
Top View
N/C
N/C
XOUT
YOUT
ZOUT
VSS
VDD
Self Test
N/C
N/C
g-Select
0g-Detect
N/C
Sleep
Figure 4. Pinout Description
Table 4. Pin Descriptions
Pin No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
Pin Name
N/C
XOUT
YOUT
ZOUT
VSS
VDD
Sleep
NC
0g-Detect
g-Select
N/C
N/C
Self Test
N/C
Description
No internal connection
Leave unconnected
X direction output voltage
Y direction output voltage
Z direction output voltage
Power Supply Ground
Power Supply Input
Logic input pin to enable product or Sleep Mode
No internal connection
Leave unconnected
Linear Freefall digital logic output signal
Logic input pin to select g level
Unused for factory trim
Leave unconnected
Unused for factory trim
Leave unconnected
Input pin to initiate Self Test
Unused for factory trim
Leave unconnected
Logic
Input
Logic
VDD Input
0.1 μF
10
9
g-Select 0g-Detect
13
Self Test
2
XOUT
MMA7361L
3.3 nF
6 VDD
3
YOUT
5
VSS
3.3 nF
PCB Layout
POWER SUPPLY
VDD
C
VSS
Sleep
g-Select
0g-Detect
Self Test
XOUT
YOUT
ZOUT
VRH
C
P0
P1
P2
P3
A/DIN
C
A/DIN
C
A/DIN
C
VDD
C
VSS
Figure 6. Recommended PCB Layout for Interfacing
Accelerometer to Microcontroller
NOTES:
1. Use 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 a 3.3nF capacitor on the outputs 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 (11 kHz for the sampling
frequency). This will prevent aliasing errors.
8. 10MΩ or higher is recommended on XOUT, YOUT and
ZOUT to prevent loss due to the voltage divider
relationship between the internal 32 kΩ resistor and
the measurement input impedance.
Logic
Input
7
Sleep
4
ZOUT
3.3 nF
Figure 5. Accelerometer with Recommended
Connection Diagram
Sensors
Freescale Semiconductor
MMA7361L
5
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