AM3358 RTC

gongchengshi

Other Parts Discussed in Thread: AM3358

Hi, I want to use the internal RTC module of AM3358, I want a super capacitor to RTC LDO power supply. When the system does not have power, the super capacitor can supply the LDO . Such a reference design?

over 9 years ago

0 Biser Gatchev-XID over 9 years ago

TI__Guru**** 393215 points

Hi,

The VDDS_RTC must be a regulated 1.8V power supply (1.8V +/- 5%). It cannot be supplied directly from a supercap. Another consideration is the relatively high current consumption of the RTC (0.02 - 0.03mA @ 1.8V, see processors.wiki.ti.com/.../AM335x_Power_Consumption_Summary ). If you need to sustain RTC for long times you might consider using an external RTC.

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AM3358 RTC