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TMS320F28035的ADC

剛使用TMS320F28035,執行Example_2803xAdcSoc的範例程式

發現連續讀取ADC的值會飄,請問這是正常的嗎?(供給ADC的電壓穩定)

PMBusSlave_DummyCommand unknown identifier not found: PMBusSlave_DummyCommandVoltage1 unsigned short[10] [204,222,210,216,220…] 0x00008E0C@Data [0] unsigned short 204 0x00008E0C@Data [1] unsigned short 222 0x00008E0D@Data [2] unsigned short 210 0x00008E0E@Data [3] unsigned short 216 0x00008E0F@Data [4] unsigned short 220 0x00008E10@Data [5] unsigned short 219 0x00008E11@Data [6] unsigned short 214 0x00008E12@Data [7] unsigned short 212 0x00008E13@Data [8] unsigned short 210 0x00008E14@Data [9] unsigned short 217 0x00008E15@DataVoltage2 unsigned short[10] [411,419,408,405,407…] 0x00008E02@Data [0] unsigned short 411 0x00008E02@Data [1] unsigned short 419 0x00008E03@Data [2] unsigned short 408 0x00008E04@Data [3] unsigned short 405 0x00008E05@Data [4] unsigned short 407 0x00008E06@Data [5] unsigned short 416 0x00008E07@Data [6] unsigned short 412 0x00008E08@Data [7] unsigned short 415 0x00008E09@Data [8] unsigned short 402 0x00008E0A@Data [9] unsigned short 404 0x00008E0B@DataSum unknown identifier not found: SumAdd new expression

Susan Yang:

请问您的参考电压是什么?ADC测量会有一定的误差,您可以参考数据手册

6.9.2.1.3 On-Chip Analog-to-Digital Converter (ADC) Electrical Data/Timing

Overall gain error with internal reference –60 60 LSB
Overall gain error with external reference –40 40 LSB

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