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Update Hardware RTC page

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Gauthier Provost 2020-04-15 19:00:27 +08:00
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docs/helios64/rtc.md
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## RTC Introduction Helios64 has an on-board RTC clock which is provided by the Power Management IC (PMIC) RK808-D. The RTC functions provided by the PMIC include second/minute/hour/day/month/year information, alarm wake up as well as time calibration.
![RTC](/helios64/img/rtc/rtc_diagram.jpg)
## Coin Cell Battery The SoC receive clock signal from the PMIC RTC and in the meantime access the PMIC RTC functions over I2C bus.
The Location of coin-type battery is shown by this figure: ## RTC Battery
![CBattery](/helios64/img/rtc/cbat.jpg)
The battery type is CR1225, this device has diameter of 12.5mm and 2.5mm thickness. To save time information and allow the RTC to keep running while system is powered off, the PMIC RTC relies on a dedicated coin battery located at BAT1. The battery holder (BAT1) accepts CR1225 battery model.
In above figure the positive (+) polarity is heading downward to the CPU heatsink side.
This battery is used only for keep the RTC (Real Time Clock) running. ![RTC Battery](/helios64/img/rtc/rtc_battery.jpg)
!!! Note
The polarity of the battery holder is indicated on the PCB with **'+'** signs.