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4
Modes of Operation
SLEEP
ACTIVE
OFF
STANDBY
WAKE
Figure 6. MMA8453Q Mode Transition Diagram
Table 7. Mode of Operation Description
Mode
OFF
STANDBY
ACTIVE
(WAKE/SLEEP)
I 2 C Bus State
Powered Down
I 2 C communication with
MMA8453Q is possible
I 2 C communication with
MMA8453Q is possible
VDD
<1.8V
ON
ON
VDDIO
VDDIO Can be > VDD
VDDIO = High
VDD = High
ACTIVE bit is cleared
VDDIO = High
VDD = High
ACTIVE bit is set
Function Description
The device is powered off. All analog and digital blocks
are shutdown. I 2 C bus inhibited.
Only digital blocks are enabled.
Analog subsystem is disabled. Internal clocks disabled.
All blocks are enabled (digital, analog).
All register contents are preserved when transitioning from ACTIVE to STANDBY mode. Some registers are reset when
transitioning from STANDBY to ACTIVE. These are all noted in the device memory map register table. The SLEEP and WAKE
modes are ACTIVE modes. For more information on how to use the SLEEP and WAKE modes and how to transition between
these modes, please refer to the functionality section of this document.
5
Functionality
The MMA8453Q is a low-power, digital output 3-axis linear accelerometer with a I 2 C interface and embedded logic used to
detect events and notify an external microprocessor over interrupt lines. The functionality includes the following:
? 8-bit or 10-bit data
? Four 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 modes for conservation of current consumption
? Single/Double tap with directional information 1 channel
? Motion detection with directional information or Freefall 1 channel
? Transient/Jolt 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
MMA8453Q
Sensors
10
Freescale Semiconductor, Inc.
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