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PDF MMA7361LC Data sheet ( Hoja de datos )
| Número de pieza | MMA7361LC | |
| Descripción | Three Axis Low-g Micromachined Accelerometer | |
| Fabricantes | Freescale Semiconductor | |
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Freescale Semiconductor
Data Sheet: Technical Data
Document Number: MMA7361LC
Rev 1, 08/2011
±1.5g, ±6g Three Axis Low-g
Micromachined Accelerometer
The MMA7361LC is a low power, low profile capacitive micromachined
accelerometer featuring signal conditioning, a 1-pole low pass filter,
temperature compensation, self test, 0g-Detect which detects linear freefall,
and g-Select which allows for the selection between two sensitivities. Zero-g
offset and sensitivity are factory set and require no external devices. The
MMA7361LC includes a Sleep Mode that makes it ideal for handheld battery
powered electronics.
Features
• 3mm x 5mm x 1.0mm LGA-14 Package
• Low Current Consumption: 400 μA
• Sleep Mode: 3 μA
• Low Voltage Operation: 2.2 V – 3.6 V
• High Sensitivity (800 mV/g @ 1.5g)
• Selectable Sensitivity (±1.5g, ±6g)
• Fast Turn On Time (0.5 ms Enable Response Time)
• Self Test for Freefall Detect Diagnosis
• 0g-Detect for Freefall Protection
• Signal Conditioning with Low Pass Filter
• Robust Design, High Shocks Survivability
• RoHS Compliant
• Environmentally Preferred Product
• Low Cost
Typical Applications
• 3D Gaming: Tilt and Motion Sensing, Event Recorder
• HDD MP3 Player: Freefall Detection
• Laptop PC: Freefall Detection, Anti-Theft
• Cell Phone: Image Stability, Text Scroll, Motion Dialing, eCompass
• Pedometer: Motion Sensing
• PDA: Text Scroll
• Navigation and Dead Reckoning: eCompass Tilt Compensation
• Robotics: Motion Sensing
Part Number
MMA7361LCT
MMA7361LCR1
MMA7361LCR2
ORDERING INFORMATION
Temperature
Range
Package
Drawing
Package
Shipping
–40 to +85°C
1977-01
LGA-14
Tray
–40 to +85°C
1977-01
LGA-14 7” Tape & Reel
–40 to +85°C
1977-01
LGA-14 13” Tape & Reel
MMA7361LC
MMA7361LC: XYZ AXIS
ACCELEROMETER
±1.5g, ±6g
Bottom View
14 LEAD
LGA
CASE 1977-01
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 1. Pin Connections
© Freescale Semiconductor, Inc., 2010, 2011. All rights reserved.
1 page  
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
Logic
Input
10 9
g-Select 0g-Delect
13
GND
2
XOUT
MMA7361LC
3.3 nF
6 VDD
3
YOUT
5
VSS
7
Sleep
3.3 nF
4
ZOUT
3.3 nF
PCB Layout
POWER SUPPLY
VDD
VSS
Sleep
g-Select
0g-Detect
Self Test
XOUT
C
YOUT
ZOUT
C VRH
P0
P1
P2
P3
C A/DIN
A/DIN
C
C A/DIN
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 3.3 nF 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. 10 MΩ 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.
Figure 5. Accelerometer with Recommended
Connection Diagram
Sensors
Freescale Semiconductor
MMA7361LC
5
5 Page 
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MMA7361LC
Rev. 1
08/2011
11 Page | ||
| Páginas | Total 11 Páginas | |
| PDF Descargar | [ Datasheet MMA7361LC.PDF ] | |
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