MMA3202KEG datasheet by Freescale Semiconductor

MMA3202KEG Frequently Asked Questions (FAQs)

• What is the recommended power-on sequence for the MMA3202KEG?
  The recommended power-on sequence is to apply VDD first, followed by VSS. This ensures that the internal voltage regulator is properly biased before the analog circuitry is powered up.
• How do I handle the self-test feature of the MMA3202KEG?
  The self-test feature can be enabled by setting the ST bit in the Control Register. During self-test, the accelerometer outputs a known acceleration value. The self-test result can be read from the Output Registers. It's recommended to perform self-test during device initialization to verify proper operation.
• What is the effect of temperature on the MMA3202KEG's accuracy?
  The MMA3202KEG's accuracy is affected by temperature. The device has a temperature coefficient of sensitivity, which means that the output voltage changes with temperature. To achieve high accuracy, it's recommended to calibrate the device over the operating temperature range.
• How do I filter out noise and vibrations when using the MMA3202KEG?
  The MMA3202KEG has a built-in low-pass filter, but additional filtering may be necessary to remove high-frequency noise and vibrations. A digital filter, such as a moving average or a low-pass filter, can be implemented in the microcontroller to further reduce noise and improve accuracy.
• What is the recommended layout and placement for the MMA3202KEG on a PCB?
  The MMA3202KEG is a sensitive device and requires careful layout and placement on a PCB. It's recommended to place the device away from noise sources, such as switching regulators and high-frequency signals. A ground plane under the device can help reduce noise and improve accuracy.