We are using STM32L151CCU6 as our new product design, this MCU only have internal reference voltage for ADC.
we are having a question about its internal ADC reference voltage of STM32L151CCU6.
VDDA is dirctly connnected to AA battery, the result that VDDA is variation slowly becuase AA battery voltage drop slowly, so my question is shown as the below:
Is it ok that VDDA is directly connected to AA battery based on electrical design viewpoint?
My schematic seen in the attached, the MCU circuit seen in the Page 1