Part Number: CC3220SF-LAUNCHXL
When I try the simplelink_cc32xx_sdk_4_10_00_07-adcsinglechannel example, I provide a 1.29V input to P57_GPIO_02, the output is the same as the input
But when I add a 57K resistor to the input
Found that running adcValue0MicroVolt = ADC_convertRawToMicroVolts (adc, adcValue0) on CCS;
adcValue0MicroVolt = 1.18
But I use a multimeter to measure P57, P57 = 0.75
I also measure the other three PIN feet when I run to
adc = ADC_open (CONFIG_ADC_0, & params); inside
MAP_ADCChannelEnable (state.baseAddr, pin);
Only my P57 voltage will drop from 1.178 to 0.75
But the other three PINs enable it and the voltage value after use is only reduced from 1.16 to 1.12
I want to ask whether there are any internal reasons for P57. When I add the 57K resistor and turn on the ADC function, only the P57 voltage will drop by 0.4V?
