External RTC Inquiry ?

Guest · Posted: Thu Mar 11, 2004 7:14 am

Hi,

What's a good external RTC chips? I understand Dallas/Maxim has this components but I decided to select other brand.

BTW, I prefer I2C or SPI.

Thank u.

mvaraujo · Joined: 20 Feb 2004 Posts: 59 Location: Brazil

Hi,

I'm using M41T81 from ST. It's I2C. Good replacement for Dallas/Maxim.

http://www.st.com/stonline/products/families/memories/rtc/nv_t81.htm

There is a version with internal XTAL e other one without. I use the second one.

Marcus

SteveS · Joined: 27 Oct 2003 Posts: 126

What features do you need? - square wave out, time of day alarm, backup battery switching, etc. (I'm in the middle of this same process).

- SteveS

Chas · Guest

Check out the PCF8563 from Philips. I've used it in limited numbers and it seems to work well.

mvaraujo · Joined: 20 Feb 2004 Posts: 59 Location: Brazil

PCF8563 from Philips is really a good choice. Pretty cheap.

However, take care of the features you need as SteveS said.