Real Time Clock for Beaglebone Black (resistors in or out?)

[mikethechap]

I've been using a ds-1307 module for some time with my Raspberry Pi. I have always hooked it up to the RPi using these instructions https://learn.adafruit.com/adding-a-rea ... ng-the-rtc. The RPi instructions say:

When building the kit, leave out the 2.2KΩ resistors - by leaving them out, we force the RTC to communicate at 3.3V instead of 5V, which is better for the Pi!

The Beaglebone Black instructions don't say anything about removing the resistors https://learn.adafruit.com/ds1307-real- ... ring-it-up.

The module has the resistors removed. Will the module still work okay in the BBB with the resistors removed? Would it be better to have the resistors in place?

Thanks!

[adafruit_support_rick]

Those are pullup resistors. The Pi has it's own pullups (the Arduino does not).
I'm not entirely certain about the BBB. What happens with the BBB? Does the module work without the resistors? It won't damage anything to try without them.

[mikethechap]

I haven't tried it yet but I will since you think it'll be okay.

Thanks!

Mike Davis

[dr.bot]

It works (or did work) with both resistors in and out. It stopped working after I accidently plugged a 12v supply into the 5v BBB.

The BBB is fine, the clock module did not survive!

[JonB256]

A "newer" Tiny RTC I2C board that I have has the same four wire connections (Vcc, Gnd, SDA, SCL) but uses surface mount resistors instead of the two discrete resistors.

While I'm confident that leaving this board "as is" will not harm anything, I wonder if you have seen this newer board.

I'll be adding it to a BBB Rev C.

Thanks. Jon