I am using RPi compute module 3. There is a situation, where I want to disconnect the power of RPi. Is it acceptable, if I keep the LOW signal for long time(~ 30 min) on RUN pin(pin #177) to disconnect the power?
Hi, thanks for your response.
Hi I designed in a way that, when the main power supply disconnects, RPi compute module running on battery power supply and also manages the power of other peripherals connected to compute module. And there might be a situation, when battery power is enough to boot the standalone RPi Compute Module, but when other peripherals connected to the module, starts draining the battery power, Compute Module power cycles as the power isn't enough now. And I have tested this, and it stuck in the power cycle loop. To avoid this situation, I have MSP430, this guy know when the power is not enough for Compute Module to power the other peripherals. In this case, MSP430 sends a low power signal to the RPI and RPi goes in shutdown state, and aftter 15-20(enough time for shutdown) seconds sending the low power signal to RPi, MSP430 keeps the RUN pin LOW to avoid the RPI to reboot again and again.aBUGSworstnightmare wrote: ↑Fri Jan 17, 2020 5:43 amI have no idea on your design, but if there would be the need for me to 'disconnect power' I would do this on the PMIC by using it's enable signal.
This will then really switch of power
Anyhow, holding the device in reset for a longer periid shouldn't be a problem.