Post by thread:[PIC] Real time clock and I2C question

Hi all, I sent a message earlier but haven't seen it come across so I'll give it another try. I have never used a real time clock or I2C comm. I found a suitable candidate, DS1388, with I2C and trickle charge for a backup battery. Unfortunately I can't find a supplier for it including Maxim. I looked at the DS1302 which is not I2C but is available however its 3 wire interface uses RC3 for a synch clock. Will this be a problem for using the other I2C devices? Any help is appreciated. Thanks, FJ

fred jones wrote: > Hi all, > I sent a message earlier but haven't seen it come across so I'll give > it another try. I have never used a real time clock or I2C comm. I > found a suitable candidate, DS1388, with I2C and trickle charge for a > backup battery. Unfortunately I can't find a supplier for it > including Maxim. I looked at the DS1302 which is not I2C but is > available however its 3 wire interface uses RC3 for a synch clock. > Will this be a problem for using the other I2C devices? Any help is > appreciated. > Thanks, > FJ > > Look at Xicor. I think somebody bought them recently, but they have a complete I2C clock family and voltage range. I no longer recommend Maxim or Dallas Semi (also Maxim) for new designs. These guys are just too flakey. --Bob -- Note: To protect our network, attachments must be sent to spam_OUTattachTakeThisOuTengineer.cotse.net . 1-520-777-7606 USA/Canada http://beam.to/azengineer

Thanks for the help. I wrote them and asked them where I could buy the DS1388 and they replied back with a link to their website (the same one I had been to already) that said it couldn't find that part number. Obviously the guy didn't check it before he sent the link to me. I'll check out Xicor. Thanks again, FJ fred jones wrote: {Quote hidden}>Hi all, >I sent a message earlier but haven't seen it come across so I'll give it >another try. I have never used a real time clock or I2C comm. I found a >suitable candidate, DS1388, with I2C and trickle charge for a backup >battery. Unfortunately I can't find a supplier for it including Maxim. I >looked at the DS1302 which is not I2C but is available however its 3 wire >interface uses RC3 for a synch clock. Will this be a problem for using the >other I2C devices? Any help is appreciated. >Thanks, >FJ > > Look at Xicor. I think somebody bought them recently, but they have a complete I2C clock family and voltage range. I no longer recommend Maxim or Dallas Semi (also Maxim) for new designs. These guys are just too flakey. --Bob -- Note: To protect our network, attachments must be sent to .....attachKILLspam@spam@engineer.cotse.net . 1-520-777-7606 USA/Canada http://beam.to/azengineer

Ferd, You can't have hardware SPI and I2C together it is not going to work. you can add software I2C or SPI. There are so many I2C clocks available pick some thing else. You can also add second crystal on pic 32k and use backup battery as trickle charge and put it in sleep when you do not need it. 18F family can run timer2 in sleep mode and you can use nano watt technology to last longer. Andre Abelian fred jones wrote: {Quote hidden}> Hi all, > I sent a message earlier but haven't seen it come across so I'll give > it another try. I have never used a real time clock or I2C comm. I > found a suitable candidate, DS1388, with I2C and trickle charge for a > backup battery. Unfortunately I can't find a supplier for it > including Maxim. I looked at the DS1302 which is not I2C but is > available however its 3 wire interface uses RC3 for a synch clock. > Will this be a problem for using the other I2C devices? Any help is > appreciated. > Thanks, > FJ > >

Fred, I went to maxim-ic.com, typed in ds1388 and it came right back with the information. They come in an 8 pin So .150 package and cost $1.66 @1k. They have a place to order samples, download the datasheet and app notes, and a bunch of other information. Just an FYI. Regards, Jim {Quote hidden}> Thanks for the help. I wrote them and asked them where I could buy the > DS1388 and they replied back with a link to their website (the same > one I had been to already) that said it couldn't find that part > number. Obviously the guy didn't check it before he sent the link to > me. I'll check out Xicor. Thanks again, > FJ > > > fred jones wrote: > >>Hi all, >>I sent a message earlier but haven't seen it come across so I'll give >>it another try. I have never used a real time clock or I2C comm. I >>found a suitable candidate, DS1388, with I2C and trickle charge for a >>backup battery. Unfortunately I can't find a supplier for it >>including Maxim. I looked at the DS1302 which is not I2C but is >>available however its 3 wire interface uses RC3 for a synch clock. >>Will this be a problem for using the other I2C devices? Any help is >>appreciated. >>Thanks, >>FJ >> >> > Look at Xicor. I think somebody bought them recently, but they have a > complete I2C clock family and voltage range. > > I no longer recommend Maxim or Dallas Semi (also Maxim) for new > designs. These guys are just too flakey. > > --Bob > > -- > Note: To protect our network, > attachments must be sent to > attachKILLspamengineer.cotse.net . > 1-520-777-7606 USA/Canada > http://beam.to/azengineer > > -

I must be an idiot. I've looked many times and I still don't find it. I found a page with the same info you state but when I click the 'buy' button it takes me to another page that says "no data found". Thanks, FJ Fred, I went to maxim-ic.com, typed in ds1388 and it came right back with the information. They come in an 8 pin So .150 package and cost $1.66 @1k. They have a place to order samples, download the datasheet and app notes, and a bunch of other information. Just an FYI. Regards, Jim > Thanks for the help. I wrote them and asked them where I could buy the > DS1388 and they replied back with a link to their website (the same > one I had been to already) that said it couldn't find that part > number. Obviously the guy didn't check it before he sent the link to > me. I'll check out Xicor. Thanks again, > FJ > > > fred jones wrote: > >>Hi all, >>I sent a message earlier but haven't seen it come across so I'll give >>it another try. I have never used a real time clock or I2C comm. I >>found a suitable candidate, DS1388, with I2C and trickle charge for a >>backup battery. Unfortunately I can't find a supplier for it >>including Maxim. I looked at the DS1302 which is not I2C but is >>available however its 3 wire interface uses RC3 for a synch clock. >>Will this be a problem for using the other I2C devices? Any help is >>appreciated. >>Thanks, >>FJ >> >> > Look at Xicor. I think somebody bought them recently, but they have a > complete I2C clock family and voltage range. > > I no longer recommend Maxim or Dallas Semi (also Maxim) for new > designs. These guys are just too flakey. > > --Bob > > -- > Note: To protect our network, > attachments must be sent to > .....attachKILLspam.....engineer.cotse.net . > 1-520-777-7606 USA/Canada > http://beam.to/azengineer > > --

Hi, I've some DS1377C that we could come to an agreement on if you only need a small quantity, and some code in basic for accessing them using a 648a or 876. I'm in Ozland though, so postage may or may not be more than direct from Maxim - yup I paid U$75 for freight - which is why I bought a few at the time. Colin -- cdb, EraseMEcolinspam_OUTTakeThisOuTbtech-online.co.uk on 23/11/2005 Web presence: http://www.btech-online.co.uk Hosted by: http://www.1and1.co.uk/?k_id=7988359 We cannot become what we need to be by remaining what we are. (Max de Pree)

Hi Colin, I don't see a 1377C listed on Maxim's website. Did you mean 1388? If so, all I can find is a DS1388Z. I would be interested in the 5V version if you have that one. Thanks, FJ From: cdb <colinspam_OUTbtech-online.co.uk> Reply-To: "Microcontroller discussion list - Public." <@spam@piclistKILLspammit.edu> To: "Microcontroller discussion list - Public." <KILLspampiclistKILLspammit.edu> Subject: Re: [PIC] Real time clock and I2C question Date: Wed, 23 Nov 2005 17:48:35 +1000 Hi, I've some DS1377C that we could come to an agreement on if you only need a small quantity, and some code in basic for accessing them using a 648a or 876. I'm in Ozland though, so postage may or may not be more than direct from Maxim - yup I paid U$75 for freight - which is why I bought a few at the time. Colin -- cdb, RemoveMEcolinTakeThisOuTbtech-online.co.uk on 23/11/2005 Web presence: http://www.btech-online.co.uk Hosted by: http://www.1and1.co.uk/?k_id=7988359 We cannot become what we need to be by remaining what we are. (Max de Pree)

Hi Fred, search for DS1337 the 'C' version will appear as an option. Feel free to email me direct, so as we can take this off list. Colin -- cdb, spamBeGonecolinspamBeGonebtech-online.co.uk on 24/11/2005 Web presence: http://www.btech-online.co.uk Hosted by: http://www.1and1.co.uk/?k_id=7988359 We cannot become what we need to be by remaining what we are. (Max de Pree)

> >suitable candidate, DS1388, with I2C and trickle charge for > a backup battery. Unfortunately I can't find a supplier for it > >including Maxim It's on their site http://www.maxim-ic.com/quick_view2.cfm/qv_pk/3696 Have you requested a couple of samples ? As the DS1388 is a new device, it may be difficult to get it from anywhere but Maxim at this stage, unless you indent a quantity. If you can't get samples (unlikely, as the DS1388 is fairly low-priced), you would be better to look around for the older models, DS1307 etc and I'm sure most of the major suppliers (RS, Mouser, Digikey) would have it The latest newsletter I got from Maxim included - the DS3232, "World's Most Accurate RTC Integrates TCXO ......". Better than +/- 1min/year they say http://www.maxim-ic.com/ds3232rtc Also DS3231 http://www.maxim-ic.com/ds3231rtc MAX6916/6917, includes uP superviser, SRAM http://www.maxim-ic.com/MAX6917rtc and the DS1388, 512x8 EEPROM (!!!) There are quite a few alternatives. Maxim list about 20. As Martin suggested, Philips have devices like the PCF8593 http://www.semiconductors.philips.com/pip/PCF8593P.html