MMA9550LR1 datasheet by Freescale Semiconductor

MMA9550LR1 Frequently Asked Questions (FAQs)

• What is the recommended power-on sequence for the MMA9550LR1?
  The recommended power-on sequence is to apply VDD first, followed by VDDIO. This ensures that the internal voltage regulators are properly enabled before the device becomes active.
• How do I configure the MMA9550LR1 for low-power mode?
  To configure the MMA9550LR1 for low-power mode, set the LPEN bit in the CTRL_REG1 register to 1. This reduces the power consumption of the device, but may affect its performance and accuracy.
• What is the maximum acceleration range that the MMA9550LR1 can measure?
  The MMA9550LR1 can measure accelerations up to ±16g. However, the device can be configured to measure lower ranges, such as ±2g or ±4g, by setting the FS bit in the CTRL_REG1 register.
• How do I calibrate the MMA9550LR1?
  The MMA9550LR1 does not require calibration in the classical sense. However, it is recommended to perform a self-test procedure to ensure that the device is functioning correctly. This involves setting the ST bit in the CTRL_REG1 register and reading the resulting data from the output registers.
• What is the purpose of the INT1 and INT2 pins on the MMA9550LR1?
  The INT1 and INT2 pins are interrupt outputs that can be configured to generate interrupts based on various events, such as data ready, overrun, or free-fall detection. These interrupts can be used to wake up a microcontroller or other device from a low-power state.