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PDF MMA7260QT Data sheet ( Hoja de datos )
| Número de pieza | MMA7260QT | |
| Descripción | Three Axis Low-g Micromachined Accelerometer | |
| Fabricantes | Freescale Semiconductor | |
| Logotipo |  |
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Freescale Semiconductor
Technical Data
±1.5g - 6g Three Axis Low-g
Micromachined Accelerometer
The MMA7260QT low cost capacitive micromachined accelerometer
features signal conditioning, a 1-pole low pass filter, temperature
compensation and g-Select which allows for the selection among 4
sensitivities. Zero-g offset full scale span and filter cut-off are factory set and
require no external devices. Includes a Sleep Mode that makes it ideal for
handheld battery powered electronics.
Features
• Selectable Sensitivity (1.5g/2g/4g/6g)
• Low Current Consumption: 500 µA
• Sleep Mode: 3 µA
• Low Voltage Operation: 2.2 V – 3.6 V
• 6mm x 6mm x 1.45mm QFN
• High Sensitivity (800 mV/g @ 1.5g)
• Fast Turn On Time
• Integral Signal Conditioning with Low Pass Filter
• Robust Design, High Shocks Survivability
• Pb-Free Terminations
• Environmentally Preferred Package
• Low Cost
Typical Applications
• 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
• Gaming: Tilt and Motion Sensing, Event Recorder
• Robotics: Motion Sensing
Device Name
MMA7260QT
MMA7260QR2
ORDERING INFORMATION
Temperature
Range
Package
Drawing
–20 to +85°C
1622-02
–20 to +85°C
1622-02
Package
QFN-16, Tray
QFN-16,Tape & Reel
Document Number: MMA7260QT
Rev 0, 10/2006
MMA7260QT
MMA7260QT: XYZ AXIS
ACCELEROMETER
± 1.5g/2g/4g/6g
Bottom View
16 LEAD
QFN
CASE 1622-02
Top View
g-Select1 1
g-Select2 2
VDD 3
VSS 4
16 15
14 13
12
Sleep
Mode
11 N/C
10 N/C
9 N/C
5678
Figure 1. Pin Connections
© Freescale Semiconductor, Inc., 2006. All rights reserved.
1 page  
BASIC CONNECTIONS
Pin Descriptions
Top View
g-Select1 1
g-Select2 2
VDD 3
VSS 4
16 15 14 13
12 Sleep Mode
11 N/C
10 N/C
9 N/C
5678
Figure 4. Pinout Description
Table 4. Pin Descriptions
Pin No.
1
2
3
4
5-7
8 - 11
12
13
14
15
16
Pin Name
g-Select1
g-Select2
VDD
VSS
N/C
N/C
Sleep Mode
ZOUT
YOUT
XOUT
N/C
Description
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.
Y direction output voltage.
X direction output voltage.
No internal connection.
Leave unconnected.
Logic
Inputs
1 g-Select1
ZOUT 13 1 kΩ
VDD
0.1 µF
Logic
Input
2 g-Select2
0.1 µF
MMA7260QT
3 VDD
YOUT 14
1 kΩ
4 VSS
12 Sleep Mode
0.1 µF
XOUT 15 1 kΩ
0.1 µF
Figure 5. Accelerometer with Recommended
Connection Diagram
PCB Layout
POWER SUPPLY
VDD
VSS
Sleep Mode
g-Select1
C
C VRH
P0
P1
g-Select2
P2
XOUT
YOUT
ZOUT
R
C
R
C
R
C
A/DIN
A/DIN
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. Do not exceed capacitor values of 2.2 or
3.3 µF.
2. Physical coupling distance of the accelerometer to
the microcontroller should be minimal.
3. The flag underneath the package is internally
connected to ground. It is not recommended for the
flag to be soldered down.
4. 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.
5. Use an RC filter with 1.0 kΩ and 0.1 µF on the
outputs of the accelerometer to minimize clock noise
(from the switched capacitor filter circuit).
6. PCB layout of power and ground should not couple
power supply noise.
7. Accelerometer and microcontroller should not be a
high current path.
8. 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.
9. PCB layout should not run traces or vias under the
QFN part. This could lead to ground shorting to the
accelerometer flag.
Sensors
Freescale Semiconductor
MMA7260Q
5
5 Page 
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RoHS-compliant and/or Pb-free versions of Freescale products have the functionality
and electrical characteristics of their non-RoHS-compliant and/or non-Pb-free
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© Freescale Semiconductor, Inc., 2006. All rights reserved.
MMA7260QT
Rev. 0
10/2006
11 Page | ||
| Páginas | Total 11 Páginas | |
| PDF Descargar | [ Datasheet MMA7260QT.PDF ] | |
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