Just to be clear, the Adafruit module has 2k2 resistors to 5V. These must be removed. However, the BBB still needs pullup resistors to 3v3.
Regards, John > On Jul 26, 2017, at 1:42 PM, William B <wbbena...@gmail.com> 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 > <https://learn.adafruit.com/adding-a-real-time-clock-to-beaglebone-black/wiring-the%20-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 > <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 > <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 beagleboard+unsubscr...@googlegroups.com > <mailto:beagleboard+unsubscr...@googlegroups.com>. > 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 > <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 beagleboard+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/beagleboard/BACFA297-6930-4F0A-B1FA-84864485210D%40gmail.com. For more options, visit https://groups.google.com/d/optout.
