In DS3231 datasheet there's a mention of 2 resistors (Rpu). What is the purpose of those and how do I determine value?
I know it says Rpu=Tr/Cb, but I couldn't find what those Tr and Cb means, which confused me even more
They are pull up resistors for the I2C lines and they should both be 4K7.
Same for the pullups on INT/SW and 32KHz.
Ah right! It's been a while, I forgot those need pullups Thanks!
One more question. Is it absolutely necessary to connect all NC pins to the ground?
Seeing as the data sheet says:-
All N.C. (no connect) pins must be connect- ed to ground.
Then I would say yes it is.
Grumpy_Mike:
Seeing as the data sheet says:-All N.C. (no connect) pins must be connect- ed to ground.
Then I would say yes it is.
Ah, I must be blind, sorry about that, it is there in bold font too!
Thanks Mike!
It seems mad the 8 pin package is so hard to get when all the extra 8 pins on the 16 pin package are just grounded.
Riva:
It seems mad they no longer make the 8 pin package when all the extra 8 pins on the 16 pin package are just grounded.
Oh yeah good point, SO16 is what I can find anyway... BTW I can only find eagle library for SO16W (wide?) version. Is there much difference between SO16 and SO16W?
This 8 pin part?
The 16's only have 1 size listed on the datasheet.
16-SOIC (0.295", 7.50mm Width)