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Operational Phases and Modes of Operation
4.3.1
Definitions
Frame Rate (FR)
Output Data Rate (ODR)
This is the basic unit of time from which all other events are timed.
The rate at which the MMA955xL platform provides conversion data to the
user for a given quantity. This will be SDR/OSR.
Over-Sample Ratio (OSR) The MMA955xL device can support on-chip filtering of sensor data. The
over-sample ratio specifies how many sample frames are required to support
a specified output data rate using a desired filtering algorithm.
? A
? D
? I
Analog phase – All analog (C2V and ADC) processing occurs here.
Depending on configuration data, the analog subsystem may have processed
samples for three dimensions of acceleration and a single auxiliary parameter,
during each ? A interval. The auxiliary parameters available include
temperature and the external ADC inputs. The CPU and associated peripherals
are normally “quiet” during this mode.
Digital phase – The CPU and peripherals are active, analog in low-power
state. Digital filtering and processing of the converted ADC values occurs
here. The length of this phase will vary depending upon the CPU load. It
cannot exceed (t F - t A ) for sample frames.
Inactive or Idle phase – Most of the device is powered down for minimal
power consumption. This phase is of variable length (t F - t A - t D ), where t F is
fixed, t A is determined by the analog front end (AFE) and t D varies depending
on CPU loading.
Sample Frame Sample frames correspond, one-to-one, for each “sample” of data.
Sample Data Rate (SDR) The rate at which the MMA955xL device requires raw conversion data from
its sensors and converters. If the device is configured for additional
over-sampling, this may be some integer times the output data rate or ODR.
One sample frame = SDR -1 seconds.
t A
t D
t I
t F
Length of ? A
Length of ? D
Length of ? I – The idle phase. This may approach zero, depending on CPU
loading.
Frame interval. This is equal to 1/FR.
MMA955xL Intelligent, Motion-Sensing Platform Hardware Reference Manual, Rev. 1.0
Freescale Semiconductor, Inc.
37
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