3-Axis, 12-bit/8-bit Digital Accelerometer

The MMA8452Q is a smart low-power, three-axis, capacitive micromachined accelerometer with 12 bits of resolution.This accelerometer is packed with embedded functions with flexible user programmable options, configurable to two interrupt pins. Embedded interrupt functions allow for overall power savings relieving the host processor from continuously polling data.

特性 Features

? 1.95V to 3.6V supply voltage

? 1.6V to 3.6V interface voltage

? ±2g/±4g/±8g dynamically selectable full-scale

? Output Data Rates (ODR) from 1.56 Hz to 800 Hz

? 99 μg/√Hz noise

? 12-bit and 8-bit digital output

?I2Cdigital output interface

? Two programmable interrupt pins for six interrupt sources

? Three embedded channels of motion detection

— Freefall or Motion Detection: 1 channel

— Pulse Detection: 1 channel

— Transient Detection: 1 channel

– Orientation (Portrait/Landscape)detection with set hysteresis

– Automatic ODR change for Auto-WAKE and return to SLEEP

– High-Pass Filter Data available real-time

–Self-Test

– RoHS compliant

– Current Consumption: 6 μA – 165 μA

Typical Applications

? eCompass applications

? Static orientation detection (Portrait/Landscape, Up/Down, Left/Right, Back/Front position identification)

? Notebook, eReader and Laptop Tumble and Freefall Detection

? Real-time orientation detection (virtual reality and gaming 3D user position feedback)

? Real-time activity analysis (pedometer step counting, freefall drop detection for HDD, dead-reckoning GPS backup)

? Motion detection for portable product power saving (Auto-SLEEP and Auto-WAKE for cell phone, PDA, GPS, gaming)

? Shock and vibration monitoring (mechatronic compensation, shipping and warranty usage logging)

? User interface (menu scrolling by orientation change, pulse detection for button replacement)