Hi All,
I am trying to find a simple way to provide battery backup for a RTC circuit (for a OKI MSM62X42BRS RTC chip) The normal primary power supply will be 5v and i am hoping to use a 3v non rechargeable Lithium CR1220 battery(which should be just enough). Am i correct in thinking that i can use a 3v Zener diode to protect the battery when 5v is available and allow 3v to supply the IC when 5v is not available ? Any help would be greatly appreciated.
Thanks
I am trying to find a simple way to provide battery backup for a RTC circuit (for a OKI MSM62X42BRS RTC chip) The normal primary power supply will be 5v and i am hoping to use a 3v non rechargeable Lithium CR1220 battery(which should be just enough). Am i correct in thinking that i can use a 3v Zener diode to protect the battery when 5v is available and allow 3v to supply the IC when 5v is not available ? Any help would be greatly appreciated.
Thanks