Feb 24, 2006 #1 kkdelabaca Full Member level 2 Joined Apr 18, 2003 Messages 140 Helped 2 Reputation 4 Reaction score 2 Trophy points 1,298 Activity points 1,105 batterypower for ds1337 Hello, I am designing a clock with the RTC (DS1337) and have a small problem: When the power is OFF, I need that the clock continues working. Somebody recommends to me a commutator for the voltage of the RTC? Regards!! kkdelabaca
batterypower for ds1337 Hello, I am designing a clock with the RTC (DS1337) and have a small problem: When the power is OFF, I need that the clock continues working. Somebody recommends to me a commutator for the voltage of the RTC? Regards!! kkdelabaca
Feb 24, 2006 #2 I IanP Advanced Member level 7 Joined Oct 5, 2004 Messages 7,929 Helped 2,311 Reputation 4,624 Reaction score 531 Trophy points 1,393 Location West Coast Activity points 66,416 Have a look at the DS1210: **broken link removed** This IC unconditionally write protects when VCC is out-of-tolerance and automatically switches to battery when power-fail occurs or on power-off .. Regards, IanP
Have a look at the DS1210: **broken link removed** This IC unconditionally write protects when VCC is out-of-tolerance and automatically switches to battery when power-fail occurs or on power-off .. Regards, IanP
Feb 26, 2006 #3 kkdelabaca Full Member level 2 Joined Apr 18, 2003 Messages 140 Helped 2 Reputation 4 Reaction score 2 Trophy points 1,298 Activity points 1,105 Hello IanP, I think that the DS1210 is a good solution. But if you put a pair of diodes 1N4148 is most cheaper. Exist some problem using this circuit? |o----DIODE----o VCC (5v) | |o----DIODE----o batery (3v) | |------------------------------o Power of DS1337
Hello IanP, I think that the DS1210 is a good solution. But if you put a pair of diodes 1N4148 is most cheaper. Exist some problem using this circuit? |o----DIODE----o VCC (5v) | |o----DIODE----o batery (3v) | |------------------------------o Power of DS1337