Forums › Devices › OSD335x C-SiP › Battery/Supercap backed RTC
Hi
I would like to have an RTC keep-alive when main power is down using a Supercap or Battery (I do not supply V_BATT as the default application is PoE).
Can I somehow supply the RTC from an external source (thinking of an 3.5V supercap that can bridge suppl for a few days) or is it safest if I use an additional RTC on my board (e.g. MCP79411T-I/SN) to have said feature?
I am using an SiT1532 as RTC oscillator, powered from the battery/supercap. Can I split the output of this oscillator and feed it both to the additional RTC X1_IN and the OSC1_IN pin? If so, how to go about the OSC1_GND? leave floating?
Or is it better to just use the external RTC? How then to correctly disable the internal RTC such that the device still boots?
Thanks!
Hello QumJo,
You can find the recommendations for your question here (https://octavosystems.com/forums/topic/rtc-circuitry/#post-10010). The RTC recommendations for OSD335x BAS apply to C-SiP as well.
You can find more useful discussions on RTC circuitry of OSD335x family under this topic (https://octavosystems.com/forums/topic/rtc-circuitry/)
Hope this helps.
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