Dear,all
SDK:8.1.0 s110
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VDD use 2.6--3.6V,use VDD bandgap: (ADC_CONFIG_REFSEL_SupplyOneThirdPrescaling << ADC_CONFIG_REFSEL_Pos)
ADC_CONFIG_INPSEL_AnalogInputOneThirdPrescaling << ADC_CONFIG_INPSEL_Pos , when adc measurement the voltage of 1.8V, the NRF_ADC->RESULT is 510; -
VDD use 1.7-2.5V,use VDD bandgap: (ADC_CONFIG_REFSEL_SupplyOneHalfPrescaling<< ADC_CONFIG_REFSEL_Pos) ADC_CONFIG_INPSEL_AnalogInputOneThirdPrescaling << ADC_CONFIG_INPSEL_Pos , when adc measurement the voltage of 1.8V, the NRF_ADC->RESULT is 336;
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VDD use 1.7-2.5V,use VDD bandgap: (ADC_CONFIG_REFSEL_SupplyOneThirdPrescaling << ADC_CONFIG_REFSEL_Pos)
ADC_CONFIG_INPSEL_AnalogInputOneThirdPrescaling << ADC_CONFIG_INPSEL_Pos
, when adc measurement the voltage of 1.8V, the NRF_ADC->RESULT is 506;
QS1: why VDD use 1.7-2.5V,the NRF_ADC->RESULT is very inaccurate.But the bandgap use
(ADC_CONFIG_REFSEL_SupplyOneThirdPrescaling << ADC_CONFIG_REFSEL_Pos)
ADC_CONFIG_INPSEL_AnalogInputOneThirdPrescaling << ADC_CONFIG_INPSEL_Pos , the NRF_ADC->RESULT is right. (QS2: the PS said it can not allow use ADC_CONFIG_REFSEL_SupplyOneThirdPrescaling when VDD is in 1.7-2.5V,it is ture????)