MMA7455LR1 datasheet by Freescale Semiconductor

MMA7455LR1 Frequently Asked Questions (FAQs)

• What is the recommended power-on sequence for the MMA7455LR1?
  The recommended power-on sequence is to apply VDD first, followed by VLOGIC, and then the clock signal. This ensures proper initialization of the device.
• How do I configure the MMA7455LR1 for low-power mode?
  To configure the MMA7455LR1 for low-power mode, set the LPEN bit in the CTRL_REG1 register to '1'. This reduces the current consumption to approximately 10 μA.
• What is the purpose of the SELFTEST bit in the CTRL_REG1 register?
  The SELFTEST bit is used to enable the self-test mode, which applies a known acceleration to the sensor and allows the user to verify the device's functionality.
• How do I interpret the output data from the MMA7455LR1?
  The MMA7455LR1 outputs 10-bit acceleration data in two's complement format. The 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 MMA7455LR1?
  The MMA7455LR1 has a maximum acceleration range of ±8g, where g is the acceleration due to gravity (approximately 9.8 m/s²).