MMA8452Q

Sensors

Freescale Semiconductor, Inc.

11

5

Functionality

The MMA8452Q is a low-power, digital output 3-axis linear accelerometer with a I

detect events and notify an external microprocessor over interrupt lines. The functionality includes the following:

•

8-bit or 12-bit data which includes High-Pass Filtered data

•

4 different oversampling options for compromising between resolution and current consumption based on application

requirements

•

Additional Low-Noise mode that functions independently of the Oversampling modes for higher resolution

•

Low-Power and Auto-WAKE/SLEEP for conservation of current consumption

•

Single-/Double-pulse with directional information 1 channel

•

Motion detection with directional information or Freefall 1 channel

•

Transient detection based on a high-pass filter and settable threshold for detecting the change in acceleration above a

threshold with directional information 1 channel

•

Portrait/Landscape detection with trip points fixed at 30° and 60° for smooth transitions between orientations.

All functionality is available in 2g, 4g or 8g dynamic ranges. There are many configuration settings for enabling all the different

functions. Separate application notes have been provided to help configure the device for each embedded functionality.

Table 8. Features of the MMA845xQ devices

Feature List

MMA8451

MMA8452

MMA8453

Digital Resolution (Bits)

14

12

10

Digital Sensitivity (Counts/g)

4096

1024

256

Data-Ready Interrupt

Yes

Yes

Yes

Single-Pulse Interrupt

Yes

Yes

Yes

Double-Pulse Interrupt

Yes

Yes

Yes

Directional-Pulse Interrupt

Yes

Yes

Yes

Auto-WAKE

Yes

Yes

Yes

Auto-SLEEP

Yes

Yes

Yes

Freefall Interrupt

Yes

Yes

Yes

32 Level FIFO

Yes

No

No

High-Pass Filter

Yes

Yes

Yes

Low-Pass Filter

Yes

Yes

Yes

Orientation Detection Portrait/Landscape = 30°, Landscape to Portrait = 60°,

and Fixed 45° Threshold

Yes

Yes

Yes

Programmable Orientation Detection

Yes

No

No

Motion Interrupt with Direction

Yes

Yes

Yes

Transient Detection with High-Pass Filter

Yes

Yes

Yes

Low-Power Mode

Yes

Yes

Yes