The page you've linked is 404. But . . #1 3v3 is the absolute max you want to put on any beaglebone I/O pins ADC lines are max 1v8 #2 If those are pullups, you have to have pullups on any I2C SCL / SDA line.
You need to read the datasheet for that part. If in fact the I2C data and clock lines are 5v, you've got the wrong part. However, I wouldn't be surprised if that part could also be powered by 3v3 too. One wire RTC's can also functionally be powered by multiple voltages. At least the one I'm using( DS3232 ). On Wed, Jul 26, 2017 at 1:42 PM, William B <[email protected]> wrote: > Hi! > I'm installing a real-time clock (RTC) on Beaglbone Black and I'm seeing > divergent information abount hardware of the DS1307 integrated circuit, > that operates at 5V voltage, while the I2C IO buses of the BeagleBone > operate at 3.3V. > > In the Adafruit RTC, they indicate removing the SCL and SDA resistors from > the DS1305 kit as shown here: > https://learn.adafruit.com/adding-a-real-time-clock-to-beaglebone-black/wiring-the > -rtc > > In linux.org, nothing is reported about the resistors and there are other > places that also do not say anything about the resistors: > http://elinux.org/Adafruit:_RTC_DS1307 > > *Question*: > Should I keep the SCL and SDA resistors? Or should I remove the resistors? > > -- > For more options, visit http://beagleboard.org/discuss > --- > You received this message because you are subscribed to the Google Groups > "BeagleBoard" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > To view this discussion on the web visit https://groups.google.com/d/ > msgid/beagleboard/3e5c2f95-d7d4-47e6-9fd9-6c027792386f%40googlegroups.com > <https://groups.google.com/d/msgid/beagleboard/3e5c2f95-d7d4-47e6-9fd9-6c027792386f%40googlegroups.com?utm_medium=email&utm_source=footer> > . > For more options, visit https://groups.google.com/d/optout. > -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/beagleboard/CALHSORpMWfamxDCZO0-7Vq1mPYVq0Yz1G7CsFE1SOuw6XUds2w%40mail.gmail.com. For more options, visit https://groups.google.com/d/optout.
