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Analog Front End
Where:
? N = The number of beams in the g-cell (unitless)
? A = The area of the facing side of the beam in meter 2
?
?? = The dielectric constant in farads per meter (1 farad = 1 coulomb per volt)
? d = The nominal distance between the beams in meters
? The mass of the object is measured in kilograms
? The acceleration of the object is measured in (m/s 2 )
10.4
Memory map overview
NOTE
The AFE Register set can be accessed (both READ and WRITE) from
Supervisor Mode only. ADC output values are made available via reserved
RAM locations once Freescale trim algorithms have been run on the data.
For further details, see Application Identifier 0x06 (XYZ_DATA_FBID) in
the MMA955xL Intelligent, Motion-Sensing Platform Software Reference
Manual (MMA955XLSWRM).
Table 10-3 summarizes the few specific fields of the AFE_CSR register that can be updated by the AFE
application and how it is used to configure the AFE for the next conversion sequence.
Table 10-3. AFE_CSR register field descriptions
Field
FS
CM
Description
Full-scale selection
AFE_CSR[FS] control AFE Full Scale selection as per Table 10-2
Conversion mode
These bits control ADC resolution/accuracy versus power and conversion time trade-offs. Values available for
end user applications are listed in Table 10-1 .
MMA955xL Intelligent, Motion-Sensing Platform Hardware Reference Manual, Rev. 1.0
Freescale Semiconductor, Inc.
187
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