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Power and System Control Circuit

1. Power ON/OFF Circuit

This circuit controls system power ON/OFF and provides functionality similar to the power button on a smartphone or similar device.

In the current mainboard design, the system is configured to boot directly after power is applied, so operating a physical power button is not required. The PMIC_PWRON signal responsible for power control is routed directly from the internal PMIC (Power Management IC) chip.

Power ON/OFF Circuit

Power ON/OFF Circuit

Signal NameConnection MethodDescription
PMIC_PWRONPulled up to 5V and directly connectedSystem power on/off signal

2. Core Board Power Circuit

The supply voltage for the core board (SoM) is 5V. The standard reference design uses the TMI3255S step-down converter from TMI to provide power. This power IC supports a maximum output current of 5A.

Core Board Power Circuit

Core Board Power Circuit

💡 Design Recommendation > If you design a custom baseboard and select a different power IC, it is strongly recommended to choose a power IC with an output capability of at least 5A to ensure stable system operation.