Low-g Accelerometer Part 2 -  Accelerometer Products and Applications <ul><li>Source: Freescale </li></ul>
Introduction <ul><li>Purpose </li></ul><ul><ul><li>This training module introduces some key products within low-g accelero...
MMA7260Q: Analog Output <ul><li>Three axes of sensitivity: XYZ </li></ul><ul><li>Selectable Sensitivity:1.5g / 2g / 4g / 6...
g-Select <ul><li>Solutions </li></ul><ul><li>Determine optimal sensitivity </li></ul><ul><ul><li>The MCU reads the acceler...
MMA7260Q Basic Connection with an MCU
MMA73xxL: Analog Output <ul><li>Features </li></ul><ul><li>3-axis analog output with g-select </li></ul><ul><ul><li>MMA736...
MMA73xxL Basic Connection with an MCU
MMA745xL: Digital Output <ul><li>Features </li></ul><ul><li>I 2 C or SPI digital output </li></ul><ul><li>Selectable sensi...
Connecting MMA745xL to an MCU using I 2 C <ul><li>I 2 C Connectivity </li></ul><ul><ul><li>I 2 C SCL and SDA </li></ul></u...
Connecting MMA745xL to an MCU using SPI <ul><li>SPI Connectivity </li></ul><ul><ul><li>SPI SCK, MISO, MOSI, CS </li></ul><...
Basic Start-up Procedure for MMA745xL  <ul><li>Set-up the microcontroller hardware for SPI or I 2 C communication. </li></...
Design Support <ul><li>Evaluation board </li></ul><ul><li>Demo board </li></ul><ul><li>Software available </li></ul><ul><l...
KIT3468MMA745xL:  Accelerometer Evaluation Board  <ul><li>The accelerometer with all pins mapped out to a 14 pin header </...
ZSTAR3 Development Tool  <ul><li>Multiple wireless sensing triple-axis reference design </li></ul><ul><li>Sensing accelera...
Sensor Placement <ul><li>The MEMS sensor is very sensitive to stress. </li></ul><ul><li>Not place the sensor near an edge ...
Human Fall Detection System <ul><li>A person's fall is usually an indicator of an emergency, especially in some groups (el...
Hardware Architecture
Additional Resource <ul><li>For ordering the low-g accelerators, please click the part list or </li></ul><ul><li>Call our ...
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Low-g Accelerometers Part 2 - Accelerometer Products and Applications

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Introduction of the key products within low-g accelerometers

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Low-g Accelerometers Part 2 - Accelerometer Products and Applications

  1. 1. Low-g Accelerometer Part 2 - Accelerometer Products and Applications <ul><li>Source: Freescale </li></ul>
  2. 2. Introduction <ul><li>Purpose </li></ul><ul><ul><li>This training module introduces some key products within low-g accelerometers, overview their features and connection with an MCU. </li></ul></ul><ul><li>Outline </li></ul><ul><ul><li>Overview of MMA7260Q </li></ul></ul><ul><ul><li>Overview of MMA73xxL </li></ul></ul><ul><ul><li>Overview of MMA745xL </li></ul></ul><ul><li>Contents </li></ul><ul><ul><li>18 pages </li></ul></ul><ul><li>Duration </li></ul><ul><ul><li>15 Minutes </li></ul></ul>
  3. 3. MMA7260Q: Analog Output <ul><li>Three axes of sensitivity: XYZ </li></ul><ul><li>Selectable Sensitivity:1.5g / 2g / 4g / 6g </li></ul><ul><li>Low current consumption: 500 µA </li></ul><ul><li>Sleep mode: 3 µA </li></ul><ul><li>Low voltage operation: 2.2V to 3.6V </li></ul><ul><li>High Sensitivity (800 mV/g @ 1.5g) </li></ul><ul><li>Fast Turn On Time </li></ul>
  4. 4. g-Select <ul><li>Solutions </li></ul><ul><li>Determine optimal sensitivity </li></ul><ul><ul><li>The MCU reads the accelerometer output. If a 1.5g setting is railed for 2 ms then the MCU can adjust the g-range to 2g and sample data again. </li></ul></ul><ul><li>Run multiple accelerometer applications </li></ul><ul><ul><li>The MCU can toggle between a freefall detection algorithm with a 1.5g setting and a vibration algorithm at the 6g setting . </li></ul></ul>
  5. 5. MMA7260Q Basic Connection with an MCU
  6. 6. MMA73xxL: Analog Output <ul><li>Features </li></ul><ul><li>3-axis analog output with g-select </li></ul><ul><ul><li>MMA736xL: 1.5g, 6g </li></ul></ul><ul><ul><li>MMA7341L: 3g, 11g </li></ul></ul><ul><ul><li>MMA733xL: 4g, 12g </li></ul></ul><ul><li>Low current consumption: 400 µA </li></ul><ul><li>Sleep mode: 3 µA </li></ul><ul><li>Low voltage operation: 2.2V to 3.6V </li></ul><ul><li>0g-Detect for freefall protection </li></ul><ul><li>Self test for freefall function check </li></ul>
  7. 7. MMA73xxL Basic Connection with an MCU
  8. 8. MMA745xL: Digital Output <ul><li>Features </li></ul><ul><li>I 2 C or SPI digital output </li></ul><ul><li>Selectable sensitivity: 2g / 4g / 8g </li></ul><ul><li>Low voltage operation: 2.4V to 3.6V </li></ul><ul><li>Self test for Z-axis </li></ul><ul><li>Low current consumption: 400 µA </li></ul><ul><li>Sleep mode: 5 µA </li></ul><ul><li>Programmable threshold interrupt output </li></ul><ul><li>Free fall interrupt output </li></ul><ul><li>Low external component count </li></ul>
  9. 9. Connecting MMA745xL to an MCU using I 2 C <ul><li>I 2 C Connectivity </li></ul><ul><ul><li>I 2 C SCL and SDA </li></ul></ul><ul><ul><li>2 Interrupts </li></ul></ul>
  10. 10. Connecting MMA745xL to an MCU using SPI <ul><li>SPI Connectivity </li></ul><ul><ul><li>SPI SCK, MISO, MOSI, CS </li></ul></ul><ul><ul><li>2 Interrupts </li></ul></ul>
  11. 11. Basic Start-up Procedure for MMA745xL <ul><li>Set-up the microcontroller hardware for SPI or I 2 C communication. </li></ul><ul><li>Configure the clock speed and all the pins required </li></ul><ul><li>Write simple single byte Read and Write command to communicate to the device. </li></ul><ul><li>Write to the MMA745xL Register $16, sending in a value of 0x05 to set up the device for measurement mode with ±2g dynamic range. </li></ul><ul><li>Read the Control Register $16 to ensure that the value is correct (0x05). </li></ul><ul><li>Read the X, Y and Z registers and watch the outputs change. </li></ul>
  12. 12. Design Support <ul><li>Evaluation board </li></ul><ul><li>Demo board </li></ul><ul><li>Software available </li></ul><ul><li>Connectors </li></ul><ul><li>CD-ROM </li></ul>
  13. 13. KIT3468MMA745xL: Accelerometer Evaluation Board <ul><li>The accelerometer with all pins mapped out to a 14 pin header </li></ul>
  14. 14. ZSTAR3 Development Tool <ul><li>Multiple wireless sensing triple-axis reference design </li></ul><ul><li>Sensing acceleration in 3-axes </li></ul><ul><li>Support for digital and analog sensors </li></ul><ul><li>Wireless communication with sensors through the 2.4 GHz band </li></ul><ul><li>RF protocol supports 16 sensors on one USB stick (receiver) </li></ul><ul><li>Configurable Sensor Data rate of 30, 60 or 120 Hz </li></ul><ul><li>Virtual serial port - interface for GUI and serial port terminal </li></ul><ul><li>Current consumption: </li></ul><ul><ul><li>In normal run mode: 1.8 - 3.9 mA, depending on the actual data rate </li></ul></ul><ul><ul><li>In sleep mode: less than 900 nA </li></ul></ul><ul><li>Smart Power consumption: power cycling is dependent on the sensor's motion detection. </li></ul><ul><ul><li>At a standstill, the board transmits only every 10th packet </li></ul></ul>
  15. 15. Sensor Placement <ul><li>The MEMS sensor is very sensitive to stress. </li></ul><ul><li>Not place the sensor near an edge where it may be knocked around or touched by people’s hands. </li></ul><ul><li>Avoid bending the PCB as the PCB stress is transferred to the accelerometer. </li></ul><ul><li>Avoid placing the sensor close to components that may have large temperature variations or that are constantly very hot. </li></ul><ul><li>Place the sensor away from the center of the device </li></ul>
  16. 16. Human Fall Detection System <ul><li>A person's fall is usually an indicator of an emergency, especially in some groups (elderly people, firemen, policemen). </li></ul><ul><li>Requirements of the system </li></ul><ul><ul><li>Small </li></ul></ul><ul><ul><li>Battery powered </li></ul></ul><ul><ul><li>Good accuracy </li></ul></ul>
  17. 17. Hardware Architecture
  18. 18. Additional Resource <ul><li>For ordering the low-g accelerators, please click the part list or </li></ul><ul><li>Call our sales hotline </li></ul><ul><li>For additional inquires contact our technical service hotline </li></ul><ul><li>For more product information go to </li></ul><ul><ul><li>http://www.freescale.com/webapp/sps/site/taxonomy.jsp?nodeId=01126911184209 </li></ul></ul>

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