Measuring the internal reference voltage using ADC | Cypress Semiconductor
Measuring the internal reference voltage using ADC
I am trying to read the battery voltage, but the reference voltage (VDDA) is not stable at all. Therefore, the output of the ADC varies a lot. I was thinking to use another resistive divider to be able to reference everything to 1.024V, but I have a lot of PCBs and I do not want to make this modification on each. Therefore, I am wondering if there is a solution to measure the reference voltage and then, from this, calculate the real VDDA.
I am using a PSOC 4xx7 BLE
Thank you in advance