Hello all. I have an 18V battery running into a baby buck 3v3 and then running regulated 3v3 power straight into raw pin on a pro mini, all sharing common ground.
Im using a switch and voltage divider to enable the baby buck 3v3 at EN pin. Voltage divider is 1M across EN and VIN/18V, and 100k across EN and ground with a switch in the middle. Testing on the breadboard I received the correct ~1.6v but now installed to my project, EN is seeing 6.27 or 6.5V. 3v3 output on baby buck is normal at 3.27v. However I am confused for:
1.) seeing 4 times expected voltage at EN (is there an internal pull up resistor on the baby buck?) I was under the impression that 6 volts was maximum allowed on EN which is why I used a voltage divider.
2.) when checking for shorts (disconnected from battery), I am seeing ~11ish ohms between Vin, ground and 3v3. Is this normal? Or inherent to small internal leaks to ground across ICs? When powered up 3v3 output is normal and the pro mini seems to be running normal, which would suggest they are all isolated.
Thank you. I apologize for any bad questions, I am newish to electronics.