DESCRIPTION

· The MMA8451Q is a 3-axis, 14-bit/8-bit digital accelerometer with low power consumption and capacitive micromachining technology.

· It features embedded functions with programmable options and configurable interrupt pins, enabling power savings by reducing the need for continuous data polling by the host processor.

· The device supports both low-pass and high-pass filtered data, facilitating efficient jolt detection and faster transitions.

· It can generate inertial wakeup interrupts from various embedded functions, allowing it to monitor events while maintaining low power during inactivity.

· Available in a 16-pin QFN package measuring 3 mm x 3 mm x 1 mm.

FEATURES

· Supply voltage range: 1.95 V to 3.6 V; interface voltage range: 1.6 V to 3.6 V.

· Dynamically selectable full scale: ±2 g, ±4 g, ±8 g.

· Output data rates (ODR) from 1.56 Hz to 800 Hz.

· Noise level: 99 μg/√Hz.

· Digital output options: 14-bit and 8-bit.

· I2C digital output interface.

· Two programmable interrupt pins supporting seven interrupt sources.

· Three embedded motion detection channels: freefall/motion, pulse, and jolt detection.

· Orientation detection with programmable hysteresis.

· Automatic ODR change for auto-wake and sleep functions.

· 32-sample FIFO with high-pass filter data access.

· Self-test capability.

· Current consumption: 6 μA to 165 μA.

APPLICATIONS

· E-compass applications and static orientation detection (portrait/landscape, up/down, left/right, back/front).

· Tumble and freefall detection in notebooks, e-readers, and laptops.

· Real-time orientation detection for virtual reality and gaming.

· Real-time activity analysis, including pedometer step counting and HDD freefall detection.

· Motion detection for power saving in portable devices (e.g., auto-sleep and auto-wake in cell phones, PDAs, GPS devices, gaming consoles).

· Shock and vibration monitoring for mechatronic compensation and usage logging.

· User interface enhancements, such as menu scrolling via orientation change and tap detection for button replacement.