RTC-Test¶

Companion board for eval-stm32f072xx.
This board should already implement much key features of helios. Switching on light by RTC should work.

• PMOSFET on RTC-Alarm-output enables max1450-blah so MCU is powered by battery.
• Enable-circuit from driver board (Switch 36V). At least isolate them from each other by 165 Ohm to limit current to 20mA. Both having 120Ohm is OK.
• WKUP-Button
• Hold-PIN (Power MCU by battery but without RTC)
  • A second pin pulling down? Leave RTC_ALARM pin unconfigured?
• Force-Button (Start MCU with battery)
• LED VDD_BAT on enable-pin of max-blah