SunFounder Pironman
6.2.6 RTC Function
The onboard microcontroller supports the RTC (Real-Time Clock) function. Install a button cell battery in the onboard
1220 battery holder, and connect the jumper cap (RTCEN) on the battery holder (by default, it is connected) to use
the microcontroller’s RTC function.
For Raspberry Pi 4
When the Pironman U1 is powered off or shut down, the microcontroller is powered by the button cell battery, recording
the time, with a standby current of about 2uA. The board does not support charging the RTC battery, so there is no
need to use a rechargeable battery. The CR1220 non-rechargeable battery provided in the kit is recommended.
If you have followed the 1. Download and Install SPC instructions, the Raspberry Pi will automatically synchronize
with the RTC time upon booting.
For Raspberry Pi 5
• Since the Raspberry Pi 5 itself supports RTC functionality, you can choose to remove the RTCEN jumper cap
to disconnect the battery from the microcontroller.
44 Chapter 6. 6. About Hardware
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