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LSM330D 데이터시트(PDF) 19 Page - STMicroelectronics

부품명 LSM330D
상세설명  Low power mode
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제조업체  STMICROELECTRONICS [STMicroelectronics]
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LSM330D
Terminology
Doc ID 022562 Rev 2
19/66
3
Terminology
3.1
Sensitivity
Linear acceleration sensitivity can be determined e.g. by applying 1 g acceleration to the
device. Because the sensor can measure DC accelerations, this can be done easily by
pointing the selected axis towards the ground, noting the output value, rotating the sensor
180 degrees (pointing towards the sky) and noting the output value again. By doing so, ±1 g
acceleration is applied to the sensor. Subtracting the larger output value from the smaller
one, and dividing the result by 2, leads to the actual sensitivity of the sensor. This value
changes very little over temperature and over time. The sensitivity tolerance describes the
range of sensitivities of a large number of sensors.
Angular Rate Sensitivity describes the angular rate gain of the sensor and can be
determined by applying a defined angular velocity to it. This value changes very little over
temperature and also very little over time.
3.2
Zero level
Linear acceleration zero-g level offset (TyOff) describes the deviation of an actual output
signal from the ideal output signal if no acceleration is present. A sensor in a steady state on
a horizontal surface will measure 0 g on both the X axis and Y axes, whereas the Z axis will
measure 1 g. Ideally, the output is in the middle of the dynamic range of the sensor (content
of OUT registers 00h, data expressed as 2’s complement number). A deviation from the
ideal value in this case is called zero-g offset.
Offset is to some extent a result of stress to 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. Offset changes little over temperature, see “Linear
acceleration zero-g level change vs. temperature” in Table 3. The zero-g level tolerance
(TyOff) describes the standard deviation of the range of zero-g levels of a group of sensors.
Angular rate zero-rate level describes the actual output value if there is no angular rate
present. zero-rate level of precise MEMS sensors is, to some extent, a result of stress to the
sensor and therefore zero-rate level can slightly change after mounting the sensor onto a
printed circuit board or after exposing it to extensive mechanical stress. This value changes
very little over temperature and over time.


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