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TMS320C6748: Battery Backup for RTC

Part Number: TMS320C6748
Other Parts Discussed in Thread: OMAP-L138

Good Morning,

We have a device designed around a TMS320C6748. We are using a 3V litium battery isolated with diodes from the main 1.3 Volts. When the unit is powered, the battery supplies more current than when is not.. The Battery life is reduced to only a couple of month. Is there a better way to implement this?