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Analog Front End
?
“N” represents the number of bits required to hold a full-scale ADC result. The actual number of
effective bits will be less than N due to noise.
The ADC conversion results are delivered in a left-justified format. They are subsequently treated as 16-bit
numbers regardless of the selected Conversion Mode, so there may be missing codes in the low-order bits.
This also keeps the scaling (Unit/LSB) independent of CM choice.
Table 10-1. Resolution and timing versus Conversion mode
ADC
numbe
Analog phase 2 ( ? s)
CM 1
r of bits
N
Three samples
Four samples
11
10
01
00
10
12
14
16
135
159
207
303
154
186
250
378
1
See the AFE Control and Status Register (AFE_CSR),
Table 10-3 .
2 Nominal Values
Besides the ADC resolution, the Full Scale range of the Analog Front End line-up can be selected through
the FS field of the AFE_CSR register.
Table 10-2 shows the various ranges versus FS setting, this applies only to the acceleration measurement.
The third column reflects the sensitivity in mg per LSB associated to a given range. The appropriate
scaling is realized by the AFE Software Routine that are further described in the MMA955xL Intelligent,
Motion-Sensing Platform Software Reference Manual (MMA955XLSWRM).
Table 10-2. AFE scaling selection
FS 1
00
01
10
11
Full-scale data range
+/-8g
+/-2g
+/-4g
+/-8g
XYZ acceleration scaling 2
(mg/LSB)
0.244
0.061
0.122
0.244
1
2
See the AFE Control and Status Register (AFE_CSR), Table 10-3 .
Nominal values, once Freescale trim algorithms have been run on the
data.
MMA955xL Intelligent, Motion-Sensing Platform Hardware Reference Manual, Rev. 1.0
Freescale Semiconductor, Inc.
183
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