Hi,
Does anyone know of a small smt real-time clock (RTC) that has a SPI
interface? Ideally, the device could still operate with a very low battery
voltage and would have a very low standby current spec.
Anybody have a favourite part or know of one? Thanks.
SPI RTC
Started by ●March 31, 2004
Reply by ●March 31, 20042004-03-31
Dick Ginther wrote:> Hi, > Does anyone know of a small smt real-time clock (RTC) that has a SPI > interface? Ideally, the device could still operate with a very low battery > voltage and would have a very low standby current spec. > Anybody have a favourite part or know of one? Thanks. > >( -> Maxim have some very low power RTC ! ) Why not I2C ? Using I2C protocol, you will save some IOs and the read/write register access of your RTC will be just easy. Larry, www.amontec.com
Reply by ●March 31, 20042004-03-31
microcontroller only has a spi interface.... "Amontec Team, Laurent Gauch" <laurent.gauch@amontecDELETEALLCAPS.com> wrote in message news:406B04F5.8090402@amontecDELETEALLCAPS.com...> Dick Ginther wrote: > > > Hi, > > Does anyone know of a small smt real-time clock (RTC) that has a SPI > > interface? Ideally, the device could still operate with a very lowbattery> > voltage and would have a very low standby current spec. > > Anybody have a favourite part or know of one? Thanks. > > > > > ( -> Maxim have some very low power RTC ! ) > > Why not I2C ? > > Using I2C protocol, you will save some IOs and the read/write register > access of your RTC will be just easy. > > Larry, > www.amontec.com >
Reply by ●March 31, 20042004-03-31
Dick Ginther wrote:> Hi, > Does anyone know of a small smt real-time clock (RTC) that has a SPI > interface? Ideally, the device could still operate with a very low battery > voltage and would have a very low standby current spec. > Anybody have a favourite part or know of one? Thanks. > >I was going to recommend DS1302 but that has a bidirectional data pin, not true SPI. Have a look at Dallas (Maxim), they should have something. -- Mike Page BEng(Hons) MIEE www.eclectic-web.co.uk
Reply by ●April 1, 20042004-04-01
Dick Ginther schrieb:> microcontroller only has a spi interface....You could bit-bang I2C on two port pins. -- Dipl.-Ing. Tilmann Reh Autometer GmbH Siegen - Elektronik nach Ma�. http://www.autometer.de
Reply by ●April 1, 20042004-04-01
http://www.maxim-ic.com/products/timers/real_time_clocks.cfm http://www.maxim-ic.com/quick_view2.cfm?qv_pk=3029&ln= MAX6902 is only $1.45. There are more choices if you have I2C. Eric www.RyherdVentures.com "Dick Ginther" <dick.ginther@vcom.com> wrote in message news:106lttv99bog865@corp.supernews.com...> Hi, > Does anyone know of a small smt real-time clock (RTC) that has a SPI > interface? Ideally, the device could still operate with a very lowbattery> voltage and would have a very low standby current spec. > Anybody have a favourite part or know of one? Thanks. > >
Reply by ●April 1, 20042004-04-01
"Dick Ginther" <dick.ginther@vcom.com> schrieb im Newsbeitrag news:106lttv99bog865@corp.supernews.com...> Hi, > Does anyone know of a small smt real-time clock (RTC) that has a SPI > interface? Ideally, the device could still operate with a very lowbattery> voltage and would have a very low standby current spec. > Anybody have a favourite part or know of one? Thanks.Hi We are using Epsom RTC4553 with build in quarz. Its only similar to SPI. But Epsom has got lots of more RTC with differnet interface. Reto
Reply by ●April 1, 20042004-04-01
"Mike Page" <mike@SCRUBeclectic-CAPSweb.BLAMEco.SWENuk> wrote in message news:1080761858.530374@news01.eclipse.net.uk...> Dick Ginther wrote: > > Hi, > > Does anyone know of a small smt real-time clock (RTC) that has a SPI > > interface? Ideally, the device could still operate with a very lowbattery> > voltage and would have a very low standby current spec. > > Anybody have a favourite part or know of one? Thanks. > > > > > > I was going to recommend DS1302 but that has a bidirectional data pin, > not true SPI. Have a look at Dallas (Maxim), they should have something. > > -- > Mike Page BEng(Hons) MIEE www.eclectic-web.co.ukYes, Dallas/Maxim has several SPI models..just check their web site. Pygmi
Reply by ●April 1, 20042004-04-01
On Wed, 31 Mar 2004 10:54:21 -0600, "Dick Ginther" <dick.ginther@vcom.com> wrote:>Hi, > Does anyone know of a small smt real-time clock (RTC) that has a SPI >interface? Ideally, the device could still operate with a very low battery >voltage and would have a very low standby current spec. > Anybody have a favourite part or know of one? Thanks. >I am using the DS1305EN. One of the very few SPI RTCs I found when I initially searched. AFAIKR it is avaialble from Digikey. Regards Anton Erasmus
