> Van: Jinx > Aan: PICLIST@MITVMA.MIT.EDU > Onderwerp: Re: [EE]: I2C Real Time Clock > Datum: vrijdag 13 oktober 2000 13:11 > > > I've got a PCF8583 here, and have some problems with it. Whenever > > the voltage swings, > > How do you mean "swings" ? When I activate my device, the voltage over the RTC goes up from the NICAD-voltage (about 2.4 volts, not 3.4 as I said below) to 5 volts TTL. That's a Voltage-swing of 2.6 volts. > The data book shows that VDD should be 2.5 - 6.0 with I2C active > and 1.0 - 6.0 with I2C inactive. VDDosc out for the crystal is 1.0 - > 6.0V. This covers both of your voltages. Yes, but I'm switching between two voltages, one for the "active" state of the whole device (5.0 volts), one for the "dormant" state (device powered down, only the clock keeps on running off a NICAD or similar). > Have you got a "funny" crystal ? I've got a small pipe-like crystal (10 mm high, 3 mm diameter), intended for use with this RTC. I have to fine-tune the frequency by using a trimmer-capacitor though (as in the specs). > Tried any others ? I'll check one of my 8593s tomorrow Nope. It's about the only crystal available for me at the moment. Regards, Rudy Wieser -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.