Shutdown Wait Time; Power-Off Time; Power-Up Delay; Power-Up Mode - Sferalabs Iono Pi Max v2 3+ Lite User Manual

Shutdown wait time

Set the shutdown wait time, in seconds.
The factory default is 60 seconds, configurable with the power/down_delay file (I2C control
register 37).

Power-off time

Set the power-off time, in seconds.
The factory default is 5 seconds, configurable with the power/off_time file (I2C control
register 38).

Power-up delay

Set the power-up delay, in seconds.
After being powered off, the Iono Pi Max controller will supply power to the Compute
Module only when the main power source is restored for at least the number of seconds
set with this parameter, or immediately if the power-up delay is set to 0.
The factory default is 0 seconds (immediate power-up), configurable with the power/
up_delay file (I2C control register 39).

Power-up mode

Set the power-up mode.
If the GPIO18 pin is set to high when the main power is not present, the Compute Module
and the whole Iono Pi Max will be powered down after the shutdown wait time, and turned
on again only when the main power is restored.
You can change this behavior so that only the Compute Module is turned off, and the
power is always restored after the power-off time, even if running on battery, with no main
power present.
The power-up mode is configured with the power/up_mode file (I2C control register 36).

UPS and battery charger

When an external lead-acid rechargeable battery is connected to Iono Pi Max battery
terminals, the Raspberry Pi Compute Module and all Iono Pi Max features will remain
powered when the main power supply fails, as long as there is enough energy in the
battery.
When power is available, the external rechargeable battery is charged with a current that
depends on the battery voltage and capacity, as configured, or kept fully charged with a
minimal floating current.
Battery operations status is visually notified with the PWR LED and can be checked
reading the I2C control registers or the corresponding sysfs files in the ups/ directory.
35 Iono Pi Max User Guide