General Description

The Freescale Semiconductor MMA7455L 3-Axis

Digital Output Accelerometer is a low power,

micro-machined sensor capable of measuring

acceleration along its X, Y, and Z axes. It

offers several convenient integrated features

including an analog to digital converter (ADC),

digital low-pass filter, and selectable sensitivity

ranges of ±2g, ±4g, or ±8g. This device can

be easily configured to detect quick motion

pulses as single-taps, double-taps, and 0g

(free-fall) conditions on any or all axes and

provides configurable interrupt pins (INT1 and

INT2) for each type of event.

Flexibility and compatibility are designed into

this module. An on-board voltage regulator

and I/O voltage level-shifters make this module

especially easy to connect to virtually any

microcontroller. It operates over a wide range

of supply voltages from 2.5 VDC to 5.5 VDC and

communicates via Serial Peripheral Interface

(SPI) or Inter-Integrated Circuit (I2C) bus.

Features

• Wide input voltage range

• Digital output (SPI/I2C)

• Selectable sensitivity: 8-bit mode

(±2g/±4g/±8g) or 10-bit mode (±8g)

• User-configurable interrupts (INT1/INT2)

• User-settable registers for calibrating

each axis

• Low current operation

• Compact, 8-pin DIP breadboard-friendly

package: 0.5” x 0.6” (12.7 x 15.2 mm)

Application Ideas

• Inertial measurement units

• Tilt sensing for remote control systems

• Single-tap or double-tap user input

• Multi-axis vibration measurement

• Free-fall detection

• Motion sensing and data logging

• Model airplane flight stabilization