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MMA6281QT/R2 Fiches technique(PDF) 1 Page - Freescale Semiconductor, Inc |
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MMA6281QT/R2 Fiches technique(HTML) 1 Page - Freescale Semiconductor, Inc |
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1 / 9 page  © Freescale Semiconductor, Inc., 2006. All rights reserved. AN3109 Rev 2, 10/2006 Freescale Semiconductor Application Note Using the Multi-Axis g-Select Evaluation Boards by: Michelle Clifford and John Young Applications Engineers Tempe, AZ INTRODUCTION This application note describes the Accelerometer Evaluation Boards for Freescale’s multi-axis g-Select accelerometers. The Accelerometer Evaluation Boards are small circuit boards intended to be used for evaluating the accelerometers and developing prototypes quickly without requiring a PCB to be designed to accommodate for the small profile QFN package. It also provides a means for understanding the best mounting position and location of an accelerometer in your product with provided board mounting points. KIT3109 CIRCUIT DESCRIPTION Figures 11 thru 13 are general circuit schematics of the evaluation boards. The recommended decoupling capacitor at the power source and recommended RC filter at each accelerometer output, are included on the evaluation board. For a complete description of the operation of the accelerometer, refer to the respective datasheet. There is an RC filter at each of the three accelerometer outputs in order to minimize clock noise that may be present from the switched capacitor filter circuit. No additional components are necessary to use the evaluation board. The evaluation boards have pads for interfacing to a 3.3 V power source or battery. The pads on the side of the board also provide a means for connecting to the accelerometer analog output by soldering a wire from the evaluation board to another breadboard or system. The ON/OFF switch enables the power to the accelerometer and helps preserve battery life if a battery is being used as the power source. S1 must be set towards the ON position for the accelerometer to function. The green LED labeled PWR is lit when power is supplied to the accelerometer. G-SELECT DIPSWITCH SETTINGS The g-Select is a powerful feature on this series of accelerometers allowing each single device to measure 4 different ranges of acceleration (see Table 1 and Table 2). The g-Select allows one device to provide multiple applications in one package. By adjusting the dip-switches on the evaluation board, the accelerometer can toggle between the different g-Ranges with the same accelerometer part. In application designs, the g-Select pins would be connected to I/O pins of a microcontroller. The following tables outline the g-Ranges that the values of the g-Select pins correspond to. Accelerometer Part Number(1) NOTES: 1. The “T” signifies parts shipped in trays. “R2” signifies parts shipped in tape and reel. Selectable g-ranges Axis Evaluation Kit Part Number(2) 2. The “E” signifies a RoHS compliant development tool. MMA7260QT/R2 1.5g, 2g, 4g, 6g XYZ-Axis KIT3109MMA7260QE MMA7261QT/R2 2.5g, 3.3g, 6.7g, 10g XYZ-Axis KIT3109MMA7261QE MMA6270QT/R2 1.5g, 2g, 4g, 6g XY-Axis KIT3109MMA6270QE MMA6271QT/R2 2.5g, 3.3g, 6.7g, 10g XY-Axis KIT3109MMA6271QE MMA6280QT/R2 1.5g, 2g, 4g, 6g XZ-Axis KIT3109MMA6280QE MMA6281QT/R2 2.5g, 3.3g, 6.7g, 10g XZ-Axis KIT3109MMA6281QE Table 1. g-Select Pin Descriptions for MMA7260QT, MMA6270QT, and MMA6280QT g-Select2 g-Select1 g-Range Sensitivity 0 0 1.5g 800 mV/g 0 1 2g 600 mV/g 1 0 4g 300 mV/g 1 1 6g 200 mV/g Table 2. g-Select Pin Descriptions for MMA7261QT, MMA6271QT, and MMA6281QT g-Select2 g-Select1 g-Range Sensitivity 0 0 2.5g 480 mV/g 0 1 3.3g 360 mV/g 1 0 6.6g 180 mV/g 1 1 10g 120 mV/g |
Numéro de pièce similaire - MMA6281QT/R2 |
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