SunFounder Pironman
The Pironman U1 features an integrated power path function, which can automatically switch power paths to reduce
battery wear and ensure uninterrupted power supply to the Raspberry Pi.
• When an external USB power source is connected, it directly supplies power to the Raspberry Pi and can also
charge the battery if needed.
• If external power is lost, the system automatically switches to battery power, ensuring uninterrupted operation.
• If external power voltage drops below 4.72V, the system automatically switches to battery power to prevent low
voltage issues in the Raspberry Pi.
Advantage: Normally powered by an external USB power source, extending the lithium battery’s lifespan. In critical
moments, it timely switches to battery power to ensure the safety of the Raspberry Pi.
Charging Current
Capable of intelligently adjusting the charging current. When the input current from the external USB power source
is sufficient, the charging current for the battery is increased, up to a maximum of 7.4V/1A. When the Raspberry Pi
requires more current, or the input current is insufficient, the charging current is automatically reduced.
Overcharge Protection
Charging ends when the total battery voltage reaches 8.4V. Charging resumes when the battery voltage drops below
8V.
Charge Balancing
During charging, the voltage of each of the two batteries is continuously monitored. If the voltage of any one battery
reaches the balance initiation voltage of 4.1V, the corresponding balance MOS is activated to reduce the charging
current of that battery.
Balance is turned off under the following conditions:
• The voltage of both batteries exceeds the balance initiation voltage of 4.1V.
• Exiting normal charging state (input overvoltage, battery full, etc.).
6.2.2 Power-On Startup
The module supports power-on startup, initiating as soon as the external power source is plugged in. To disable auto-
matic power-on, remove the ALWAYS ON jumper cap. This requires manually pressing the power button to start the
Raspberry Pi, even when an external power source is connected or after a power outage.
40 Chapter 6. 6. About Hardware
To Next Page
Loading...