KX022-1020 Datasheet, PDF (11/75 Pages) List of Unclassifed Manufacturers – Accelerometer Specifications

± 2g / 4g / 8g Tri-axis Digital
Accelerometer Specifications
PART NUMBER:
KX022-1020
Rev. 11.0
10-Sep-15
Terminology
g
A unit of acceleration equal to the acceleration of gravity at the earth's surface.
1g

9.8
m
s²
One thousandth of a g (0.0098 m/ s²) is referred to as 1 milli-g (1 mg).
Sensitivity
The sensitivity of an accelerometer is the change in output per unit of input acceleration at nominal
VDD and temperature. The term is essentially the gain of the sensor expressed in counts per g
(counts/g) or LSB’s per g (LSB/g). Occasionally, sensitivity is expressed as a resolution, i.e. milli-g per
LSB (mg/LSB) or milli-g per count (mg/count). Sensitivity for a given axis is determined by
measurements of the formula:
Sensitivity  ^{Output @1g  Output @1g}
2g
The sensitivity tolerance describes the range of sensitivities that can be expected from a large
population of sensors at room temperature and over life. When the temperature deviates from room
temperature (25ºC), the sensitivity will vary by the amount shown in Table 1.
Zero-g offset
Zero-g offset or 0-g offset describes the actual output of the accelerometer when no acceleration is
applied. Ideally, the output would always be in the middle of the dynamic range of the sensor (content
of the OUTX, OUTY, OUTZ registers = 00h, expressed as a 2’s complement number). However,
because of mismatches in the sensor, calibration errors, and mechanical stress, the output can deviate
from 00h. This deviation from the ideal value is called 0-g offset. The zero-g offset tolerance describes
the range of 0-g offsets of a population of sensors over the operating temperature range.
Self-test
Self-test allows a functional test of the sensor without applying a physical acceleration to it. When
activated, an electrostatic force is applied to the sensor, simulating an input acceleration. The sensor
outputs respond accordingly. If the output signals change within the amplitude specified Table 1, then
the sensor is working properly and the parameters of the interface chip are within the defined
specifications.
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