FXLC95000CL Datasheet, PDF (21/38 Pages) Freescale Semiconductor, Inc – Xtrinsic FXLC95000CL Intelligent, Motion-Sensing Platform

Mechanical and Electrical Specifications
5.1 Definitions
cross-axis sensitivity
deep-sleep mode
full range
hardware compensated
nonlinearity
pin group
sensitivity
software compensated
warm-up time
zero-g offset
The proportionality constant that relates a variation of accelerometer output to cross
acceleration. This sensitivity varies with the direction of cross acceleration and is
primarily due to misalignment.
The device’s lowest power state, when the system clock is stopped and the device
performs no functions. In this mode, only a few exception events can wake the device.
The maximum level of acceleration supported by the accelerometer's output signal,
typically specified in ±g. For example, the output of an accelerometer program in ±2 g
mode will be linear when subjected to accelerations within ±2 g. If the acceleration is
larger than ±2 g, the output will not be linear and may rail.
Sensor modules on this device include hardware correction factors for gain and offset
errors which are calibrated during factory test using a least-squares fit of the raw sensor
data.
A measurement of deviation from perfect sensitivity. Ideally, the relationship between
input and output is linear and described by the sensitivity of the device.
Device pins are clustered into a number of logical pin groupings in order to simplify and
standardize electrical data sheet parameters. Pin groups are defined in Table 6.
Describes the gain of the sensor and can be determined by applying a 1 g acceleration
to it, such as the earth's gravitational field. The sensitivity of the sensor can be
determined by subtracting the -1 g acceleration value from the +1 g acceleration value
and dividing by two.
In addition to the first-order hardware gain and offset calibration features, Freescale
implements advanced, nonlinear calibration functions to improve sensor performance.
The time—from the initial application of power—for a sensor to reach specified
performance under specified operating conditions.
Describes the deviation of an actual output signal from the ideal output signal, if no
acceleration is present. The expected ideal output signal, in this case, would be zero. A
deviation from ideal value is called zero-g offset. Offset is, to some extent, a result of
stress on the MEMS sensor and, therefore, the offset can slightly change after
mounting the sensor onto a printed circuit board or exposing it to extensive mechanical
stress.
5.2 Absolute maximum ratings
Absolute maximum ratings are stress ratings only and functional operation at the
maximum ratings is not guaranteed. Stress beyond the limits specified here may affect
device reliability or cause permanent damage to the device. For functional operating
conditions, refer to the remaining tables in this section.
Xtrinsic FXLC95000CL Intelligent, Motion-Sensing Platform, Rev1.2, 8/2013.
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Freescale Semiconductor, Inc.