MMA7455LT datasheet by Freescale Semiconductor

MMA7455LT Frequently Asked Questions (FAQs)

• What is the recommended power-on sequence for the MMA7455LT?
  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 configure the MMA7455LT for low-power mode?
  To configure the MMA7455LT for low-power mode, set the LP bit in the Mode Register (0x16) to 1. This reduces the current consumption to approximately 10 μA.
• What is the purpose of the SELFTEST pin?
  The SELFTEST pin is used to perform a self-test of the accelerometer. When the SELFTEST pin is pulled high, the device performs a self-test and outputs the results on the XOUT, YOUT, and ZOUT pins.
• How do I interpret the output data from the MMA7455LT?
  The MMA7455LT outputs acceleration data in 10-bit, 2's complement format. The output data is scaled to represent acceleration in units of mg (milli-g). A positive value indicates acceleration in the positive direction, while a negative value indicates acceleration in the negative direction.
• What is the maximum acceleration range of the MMA7455LT?
  The MMA7455LT has a maximum acceleration range of ±8g. However, the device can be configured to operate in a ±2g or ±4g range by setting the FS bit in the Mode Register (0x16).