Bye kid.
Kid? Please...
Yes, on the Raspberry Pi 5, the PMIC (Power Management Integrated Circuit) typically keeps the 3.3V rail energized even when the Pi is in standby or shutdown mode. This behavior allows certain GPIO pins, which operate on the 3.3V rail, to remain powered, enabling wake-up functionalities or the operation of external circuits even when the Pi is not fully powered on.
This constant 3.3V supply is necessary for maintaining certain low-power operations, such as the ability to detect a wake-up signal from a connected device or a button press.
Chat GPT again?
Yes, I'm well aware that some HATs and other devices require a 3.3v supply even when the Pi is otherwise "off". You seem to be under several misaprehensions:
- That the Pi has a usable "standby" mode. It does not. The SoC, RP1, ethernet etc are either powered or not. When not, the only thing running is the PMIC and that, in the default config, provides 3.3v in addition to the always on 5v.
- That the power button/pads on a Pi5 are connected to the SoC. They are not, they're connected to the PMIC.
- That the official documentation I linked to is incorrect (https://www.raspberrypi.com/documentati ... figuration). It isn't.
- Connect LED and current liiting resistor between +3.3v (physical pin 1) and ground.
- Connect power. LED lights
- Login
Code:
sudo rpi-eeprom-config --edit- Change POWER_OFF_ON_HALT=0 to POWER_OFF_ON_HALT=1
- Save and close
- Reboot. LED lights while status LED is still showing red
- Shutdown. LED goes out.
Sounds like exactly what you're looking fo and exactly like I'd expect from the documentation.
Statistics: Posted by thagrol — Mon Sep 02, 2024 9:21 pm