MMA8451 3 Axis Digital Accelerometer with Voltage Regulator

Introduction

The MMA8451Q is a smart low-power, three-axis, capacitive micro machined accelerometer with 14 bits of resolution and ±2g, ±4g, ±8g of user selectable full scale ranges. MMA8451 accelerometer module has onboard 3.3V low drop voltage regulator and it can be powered by 3.6V to 6V DC supply. Board has two mounting holes. All 9 pins of the module are arranged in single line. The I2C interface is capable of operating at 2.25 MHz with appropriate pull ups. The Embedded interrupt functions allow for overall power savings relieving the host processor from continuously polling data. The device can be configured to generate inertial wakeup interrupt signals from any combination of the configurable embedded functions allowing the MMA8451Q to monitor events and remain in a low power mode during periods of inactivity which makes it best suitable for battery powered applications.

Downloads

MMA8451Q Datasheet
MMA8451Q Module User Manual
Interfacing MMA8451Q 3Axis Digital Accelerometer with LPC2148 ARM7 microcontroller over I2C port

Applications

• Robotics
• Tilt and Motion Sensing
• eCompass
• shock and vibration monitoring
• Real Time Orientation detection
• Freefall detection

MMA8451 3 Axis Digital Accelerometer Module Features

• Onboard 3.3V Low Drop voltage regulator with input range of 3.6V to 6V.
• Dimensions: 0.9”(L) X 0.5”(W)
• 2 x Mounting holes
• Acceleration along X, Y & Z axis
• I2C digital output interface (with on board pull ups)
• ±2g/±4g/±8g dynamically selectable full-scale acceleration
• Sensitivity:
  ±2g : 4096 counts/g
  ±4g : 2048 counts/g
  ±8g : 1024 counts/g
• Output Data Rates (ODR) from 1.56 Hz to 800 Hz
• 14-bit and 8-bit digital output
• Orientation (Portrait/Landscape) detection with programmable hysteresis
• High Pass Filter Data available per sample and through the FIFO
• Self-Test
• Current Consumption: 6 μA – 165 μA

Package contains

One MMA8451Q 3-axis Digital Accelerometer with Voltage Regulator
9 pin female Berg connector
Four M3 6mm Screws
Two 12mm Studs

Dimensions

Schematic

I2C interface between MMA8451Q and 3.3V microcontroller

1. 3V3OUT is capable of delivering 3.3V@ 40mAmps. It can be used to set up pull ups for I/O pins related to MMA8451. It should not be used for other purposes.
2. SA0 pin on the module should be connected to either logic 0 or 1 to define the LSB of 7 bit I2C address. In the demo application this pin is connected to logic 0 or GND.

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