MMA7455L 3-Axis Low-g Digital Output Accelerometer

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Introduction

The MMA7455L is a Digital Output (I2C/SPI), low power, low profile capacitive micromachined accelerometer featuring signal conditioning, a low pass filter, temperature compensation, self-test, configurable to detect 0g through interrupt pins (INT1 or INT2), and pulse detect for quick motion detection. 0g offset and sensitivity are factory set and require no external devices. The 0g offset can be customer calibrated using assigned 0g registers and g-Select which allows for command selection for 3 acceleration ranges (2g/4g/8g). The MMA7455L includes a Standby Mode that makes it ideal for handheld battery powered electronics.

Layout all useful pin and breadboard friendly board breaks out every pin of the MMA7455L to a 8-pin DIP, 0.1" (2.54mm)pitch header. The sensor works on power between 2.2 and 3.6VDC (3.3V optimal), and typically consumes just 400µA of current. All three axes have their own analog output.

7455-02.jpg 7455-03.jpg

Model: ACL03

Feature

  • Digital Output (I2C/SPI)
  • 3mm x 5mm x 1mm LGA-14 Package
  • Low Current Consumption: 400 μA
  • Self-Test for Z-Axis
  • Low Voltage Operation: 2.4 V – 3.6 V
  • User Assigned Registers for Offset Calibration
  • Programmable Threshold Interrupt Output
  • Level Detection for Motion Recognition (Shock, Vibration, Freefall)
  • Pulse Detection for Single or Double Pulse Recognition
  • Sensitivity (64 LSB/g @ 2g and @ 8g in 10-Bit Mode)
  • Selectable Sensitivity (±2g, ±4g, ±8g) for 8-bit Mode
  • Robust Design, High Shocks Survivability (5,000g)
  • RoHS Compliant
  • Environmentally Preferred Product
  • Low Cost
  • PCB Size:24.9(mm)x12.7(mm)

Application Ideas

  • Cell Phone/PMP/PDA: Image Stability, Text Scroll, Motion Dialing, Tap to Mute
  • HDD: Freefall Detection
  • Laptop PC: Freefall Detection, Anti-Theft
  • Pedometer
  • Motion Sensing, Event Recorder

Cautions

  • Low Voltage Operation: 2.4 V – 3.6 V, do not over 3.6V, that maybe destroy the module.

Schematic

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Pin definition and Rating

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Mechanic Dimensions

  • PCB Size:24.9(mm)x12.7(mm)

Usage

  • Compare Size between MMA7455L and MMA7361L

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Hardware Installation

7455-08.jpg

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Example

The projects and application examples.

  • Breadboard friendly board breaks out every pin of the MMA7455L to a 8-pin DIP, 0.1" (2.54mm)pitch header.

7455-05.jpg

Bill of Materials (BOM) /parts list

Comment             Pattern     Quantity  Components
------------------------------------------------------------------------------
0                   0603R            2    R1, R4                                            
104                 0603             1    C4                           Capacitor            
104                 0603R            2    C2, C3                       Capacitor            
106                 1206             2    C1, C5                       Capacitor            
1K                                   1    R6                                                
4.7K                0603R            3    R2, R3, R5                                        
CON4                HEAD4            2    J1, J2                       Connector            
LED                                  1    D1                                                
MMA7455             LGA14            1    U2                                                
RT9161              SOT-89           1    U1

FAQ

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Support

If you have questions or other better design ideas,

Version Tracker

Revision Descriptions Release
v2.0 Public release date

Bug Tracker

Bug Tracker is the place you can publish any bugs you think you might have found during use. Please write down what you have to say, your answers will help us improve our

products.

Resources

How to buy

Click here to buy: http://www.elecfreaks.com/estore/mma7455l-3-axis-low-g-digital-output-accelerometer-acl03.html

See Also

Other related products and resources.

Licensing

This documentation is licensed under the Creative Commons Attribution-ShareAlike License 3.0 Source code and libraries are

licensed under GPL/LGPL, see source code files for details.

External Links

Links to external webpages which provide more application ideas, documents/datasheet or software libraries