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MMA7455L датащи(PDF) 3 Page - Freescale Semiconductor, Inc

номер детали MMA7455L
подробное описание детали  짹2g/짹4g/짹8g Three Axis Low-g Digital Output Accelerometer
PDF  35 Pages
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производитель  FREESCALE [Freescale Semiconductor, Inc]
домашняя страница  http://www.freescale.com
Logo FREESCALE - Freescale Semiconductor, Inc

MMA7455L датащи(HTML) 3 Page - Freescale Semiconductor, Inc

  MMA7455L Datasheet HTML 1Page - Freescale Semiconductor, Inc MMA7455L Datasheet HTML 2Page - Freescale Semiconductor, Inc MMA7455L Datasheet HTML 3Page - Freescale Semiconductor, Inc MMA7455L Datasheet HTML 4Page - Freescale Semiconductor, Inc MMA7455L Datasheet HTML 5Page - Freescale Semiconductor, Inc MMA7455L Datasheet HTML 6Page - Freescale Semiconductor, Inc MMA7455L Datasheet HTML 7Page - Freescale Semiconductor, Inc MMA7455L Datasheet HTML 8Page - Freescale Semiconductor, Inc MMA7455L Datasheet HTML 9Page - Freescale Semiconductor, Inc Next Button
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Sensors
Freescale Semiconductor
3
MMA7455L
List of Figures
Pin Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Simplified Accelerometer Functional Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Simplified Transducer Physical Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Single Pulse Detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Freefall Detection in Pulse Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Double Pulse Detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Single Byte Read - The Master is reading one address from the MMA7455L . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Multiple Bytes Read - The Master is reading multiple sequential registers from the MMA7455L . . . . . . . . . . . . . . . . . . . . . . . 17
Single Byte Write - The Master (MCU) is writing to a single register of the MMA7455L . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Multiple Byte Writes - The Master (MCU) is writing to multiple sequential registers of the MMA7455L . . . . . . . . . . . . . . . . . . . 17
SPI Timing Diagram for 8-Bit Register Read (4 Wire Mode) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
SPI Timing Diagram for 8-Bit Register Read (3 Wire Mode) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
SPI Timing Diagram for 8-Bit Register Write (3 Wire Mode) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Pinout Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
I2C Connection to MCU . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
SPI Connection to MCU . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Sensing Direction and Output Response at 2g Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Recommended PCB Land Pattern for the 5 x 3 mm LGA Package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Incorrect PCB Top Metal Pattern Under Package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Correct PCB Top Metal Pattern Under Package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Recommended PCB Land Pad, Solder Mask, and Signal Trace Near Package Design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Stencil Design Guidelines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Temperature Coefficient of Offset (TCO) and Temperature Coefficient of Sensitivity (TCS) Distribution Charts . . . . . . . . . . . 32
MMA7455L Current Distribution Charts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32



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