core voltage is too high for ESP32 ADC measurement

[skot]

The ESP32 measures the ASIC core voltage (TPS40305 output) via an ADC pin. 4.5V is too high to measure directly. put a voltage divider in there.

[macphyter]

I changed this input to a voltage divider, and I used two 10K resistors as placeholders until I could go figure out the real values. Looks like I forgot to set the new values. Keeping this issue open until I do that.

[skot]

How about 100k and 226k for a 0.7 voltage divider? this makes VDD_SAMPLE = 2.5V for VDD = 3.6V and VDD_SAMPLE = 3.12V for VDD = 4.5V

[macphyter]

I chose 69.8K and 182K just because we are already using those values and we wouldn't have to add any unique parts to the BOM. This gives us VDD_SAMPLE = 2.6V for VDD = 3.6V, and VDD_SAMPLE = 3.25V for VDD = 4.5V.
In any case, its a simple resistor swap to change this.