Why Or'd Vcc with backup battery output shorted battery life?

[mackrackit]

I thought I would have to also put one on the leg of the backup battery supply so that when Vcc is active, that diode protects the backup battery from the Vcc voltage.

I might be doing it wrong, but with VCC being 3 volts I have not had any problems.

evidently it will keep on trucking when Vcc is shut down. Correct??

Correct, I had a part that got pushed to the back of the bench for around six months (no external power) and the RTC was still alive when I fired it up.

can you take a look at my EMAIL routine

Yes, I am looking at it.

[BobK]

Hi John,

When I sent you my DS1337 schematic last year I only showed the two diodes connected to the Vcc of the 1337. I had the resistors connected to the PIC's Vcc for the very reason that you are experiencing now.

BobK

[Demon]

Moved from Schematics.

Robert