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Auto Power-On

To ensure the LattePanda Mu compute module boots up automatically when power is applied, an external hardware circuit is required on the carrier board.

  • ✅ Hardware-based implementation is strongly recommended for reliability. This ensures consistent boot behavior even after abnormal power loss or rapid power cycling.
  • ❌ Not Recommended: Relying solely on BIOS menu settings like "Restore AC Power Loss".

Reference Circuit

Circuit Principle

The purpose of this circuit is to electrically simulate the physical action of pressing the power button.

  1. Initialization: The circuit activates immediately when the carrier board receives power.

  2. Action: It pulls the PWR_BTN# (Power Button) signal LOW for a specific duration (simulating a "Press"), triggering the compute module's boot sequence.

  3. Release: After the delay, it releases PWR_BTN# back to HIGH (simulating a "Release").

JP1 is a jumper. When JP1 is ON, the automatic power-on function is enabled.

Power Requirement

  • 3.3V standby power supply is required for powering the auto power-on circuit.

    The standby power remains continuously active as long as external power is applied to the carrier board, regardless of the compute module's operational state (running or shut down).

    For this auto power-on circuit, a 3.3V standby power supply is required.