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The ADC (Analog-to-Digital Converter) architecture of Nuvoton’s microcontroller (MCU) is mostly equipped with SAR ADC (Successive approximation ADC), which needs to store the charge in the sample-and-hold capacitor inside the ADC in use. User needs to make sure that the sample-and-hold capacitor after charging is equal to the external measurement voltage before starting the analog-digital conversion to obtain an accurate voltage value. When a longer charge time is required, the user can set a longer sampling time by using the SMPTSEL (EADC_CTL [18:16]) & EXTSMPT (EADC_SCTLn [31:24]) to make the capacitor voltage equal to the external voltage.
例如,SMPTSEL=8,EXTS MPT=200,则采样时间为200,28=210(ADC时钟),ADC时钟为10MHz,21μs采样时间,保持电容器充电。 这确保了外部测量电压相等,以获得精确的电压值。 |
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