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Giải thích chi tiết về linh kiện  How to improve ADC accuracy when using STM32F2xx and STM32F4xx microcontrollers
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nhà sản xuất  STMICROELECTRONICS [STMicroelectronics]
Trang chủ  http://www.st.com
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STM32F4 ADC accuracy options
AN4073
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DocID022945 Rev 5
Figure 11. Distribution of ADC codes when ART is OFF and VIN = 1.65 V
In the same conditions, when ART is OFF, using the Default STM32 configuration with
STM32F2xx or STM32F405/F415/F407/F417 gives a maximum dispersion of 24 LSB (refer
to Table 3) while, in this case, the maximum dispersion is 10 LSB.
This confirms that the default STM32 configuration embedded on these products allows to
achieve more than 50 % of dispersion code versus STM32F2xx/F405/F415/F407/F417, and
about 75 % when one of the options is active.
3.
ADC measurements when (Data+Instruction) cache ON + Prefetch OFF
The following table and graph show the ADC code distribution when (Data + Instruction)
cache ON and prefetch OFF at three different conditions: default STM32 configuration,
Option 1 and Option 2 are active.
0
5000
10000
15000
20000
25000
30000
2044
2045
2046
2047
2048
2049
2050
2051
2052
2053
code (dec)
Default
Option 1
Option 2
MS30759V1
Table 9. Distribution of ADC codes when (Data+Instruction) cache ON + prefetch OFF
VIN
Default
Option 1
Option 2
Dispersion
(LSB)
sample over +-
5 LSB
Dispersion
(LSB)
sample over
+-5 LSB
Dispersion
(LSB)
sample over +-
5 LSB
0.3 V
7
0%
4
0%
4
0%
1.65 V
8
0%
6
0%
6
0%
3V
7
0%
6
0%
7
0%



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