KIT1925MMA6233Q

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The KIT1925MMA6233Q evaluation board from Freescale, is designed to demonstrate the capabilities of the Freescale MMA6233Q Q-Motion© Sensor technology. This device functions as a tilt/angle sensor enabling the user to measure the tilt angle about an axis up to ±180° (three dimensional). Using this evaluation board, the user gets to sample the advantages of the MMA6233Q technology such as low power consumption in an extremely small form factor.

The tilt/angle sensor features a bipolar output in the form of two complementary open collector outputs. When the device “senses” no tilt i.e., when the tilt angle is zero, the output at the A− and A+ pins (pins 2 and 3 respectively) is low threshold. When tilted away from the zero degree angle, the corresponding output pin goes high, and each degree away from the zero angle is proportional to a 0.01V change in voltage from the low threshold level. The user can choose the zero angle for the sensing variable from among several available settings.

The working principle of the KIT1925MMA6233Q evaluation board is relatively simple. It housing is contained within an 8 pin SOP package that is integrated with a silicon die and internal circuitry. When the power is applied the silicon die holds two matched resistors whose surfaces are etched with a high precision waveform. In order to measure the tilt angle, the silicon die responds to the change in the magnetic field produced by the two waveform patterns. This will activate the internal sensing circuitry to provide the analogue voltage output.

The method of operation for the KIT1925MMA6233Q evaluation board is three-fold. Firstly, the user sets the zero angle for the sensing variable, from the available settings as stated above. Secondly, the voltage change from the low threshold level is detected when the sensing variable with a high precision value which is proportional to the tilt angle. This value is stored and read out from the output pins in the form of digital signals. Finally, this digital output is used to monitor the tilt angle and activate suitable applications.

Due to its state-of-the-art measuring capabilities, the KIT1925MMA6233Q evaluation board can find a wide range of applications. It can be used for navigation, remote control and signal recognition applications in various fields such as hand-held devices, biomedical engineering, home appliances, consumer electronics and industrial automation. It can also be used to measure rotational motion generated by bilge keels. In addition, it can be utilized in robotic applications for controlling moving parts of robots precisely and reliably. Moreover, the device can be employed to check the level of hazardous terrain when used in conjunction with GPS for field-testing.

In summary, the KIT1925MMA6233Q evaluation board is a small and low power tilt/angle sensor device that can provide extremely precise tilt measurements in a wide range of applications. It is equipped with complementary open collector outputs that can be used to monitor the tilt angle in digital signals; making it suitable for various usage. The evaluation board provides users an efficient way to test the capabilities of Freescale’s MMA6233Q Q-Motion© Sensor technology before incorporating them in their projects.

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