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PDF MMA7340L Data sheet ( Hoja de datos )
| Número de pieza | MMA7340L | |
| Descripción | Three Axis Low-g Micromachined Accelerometer | |
| Fabricantes | Freescale Semiconductor | |
| Logotipo |  |
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www.DFaretaeSshceeatl4eUS.ceommiconductor
Technical Data
±3g - 12g Three Axis Low-g
Micromachined Accelerometer
The MMA7340L 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 2 sensitivities. Zero-g
offset and sensitivity are factory set and require no external devices. The
MMA7340L 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
• Selectable Sensitivity (±3g, ±12g)
• 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, E-Compass
• Pedometer: Motion Sensing
• PDA: Text Scroll
• Navigation and Dead Reckoning: E-Compass Tilt Compensation
• Robotics: Motion Sensing
Part Number
MMA7340LT
MMA7340LR2
ORDERING INFORMATION
Temperature
Range
Package
Drawing
Package
–20 to +85°C
1935-01
LGA-14
–20 to +85°C
1935-01
LGA-14
Shipping
Tray
Tape & Reel
Document Number: MMA7340L
Rev 0, 1/2007
MMA7340L
MMA7340L: XYZ AXIS
ACCELEROMETER
±3g, ±12g
Bottom View
14 LEAD
LGA
CASE 1935-01
Top View
N/C 1
XOUT 2
YOUT 3
ZOUT 4
N/C
14
13 Self Test
12 N/C
11 N/C
10 g-Select
VSS 5
VDD 6
7
Sleep
9 0g-Detect
8 N/C
Figure 1. Pin Connections
© Freescale Semiconductor, Inc., 2007. All rights reserved.
1 page  
BASIC CONNECTIONS
Pin Descriptions
Top View
N/C
N/C 1
XOUT 2
14
13 Self Test
12 N/C
YOUT 3
11 N/C
ZOUT 4
10 g-Select
VSS 5
9 0g-Detect
VDD 6
8 N/C
7
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
MMA7340L
3.3 nF
6 VDD
3
YOUT
5
VSS
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 3.3nF 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.
Logic
Input
7
Sleep
4
ZOUT
3.3 nF
Figure 5. Accelerometer with Recommended
Connection Diagram
Sensors
Freescale Semiconductor
MMA7340L
5
5 Page | ||
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| PDF Descargar | [ Datasheet MMA7340L.PDF ] | |
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