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RTC / Backup Battery on BeageBone Black rev C

Other Parts Discussed in Thread: AM3358

Hi All,

Have a problem with the RTC on AM3358.

On BBB rev C (debian 7.4) I'm using a battery backup (3.7V/2Ah) connected on PMIC......

Turn-off and turn-on the board, the RTC restart with a wrong date/time....

Can You help me? I've 23 demo board in the field and it is a very problem for me.

Thanks in advance.

Enrico 

  • Hi Enrico,

    To keep accurate time the AM335X must enter RTC-only mode. In this mode all power rails except VDDS_RTC are switched off. This corresponds to SLEEP mode of the TPS65217C. You can find more details in the AM335X TRM Rev. L (sections 8.1.4.3.5, 8.1.4.3.6 and 20.3.3.8) and the TPS65217C Datasheet (section "MODES OF OPERATION").