MMA6525KW datasheet(53/56 Pages) FREESCALE

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Sensor

Freescale Semiconductor, Inc.

MMA65xx

4.7

Acceleration Data Representation

Acceleration values are determined from the 12-bit digital output (DV) using the following equations:

The linear range of digital values for signed data is -1920 to +1920, and for unsigned data is 128 to 3968. Resulting ranges

and some nominal acceleration values are shown in the following table.

Table 34. Nominal Acceleration Data Values

Unsigned Digital Value

Signed Digital Value

Nominal Acceleration

105g

120g

3969 - 4095

1921 - 2047

Unused

3968

1920

80.000

105.49

120.00

3967

1919

79.958

105.44

119.94

•

2050

0.083333

0.1099

0.1250

2049

0.041667

0.0545

0.0625

2048

g0g0

2047

-1

-0.041667

-0.0545

-0.0625

2046

-2

-0.083333

-0.1099

-0.1250

•

129

-1919

-79.958

-105.44

-119.94

128

-1920

-80.000

-105.49

-120.00

1 - 127

-1921 - 2048

Unused

Fault

Acceleration

Sensitivity

LSB

2048

–

()

Acceleration

Sensitivity

LSB

For Signed Data

For Unsigned Data

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