Tiny rtc interfacing

[oco89]

Hello, every one

Sorry for my bad English .

I would know  on due board how i can interfacing the tiny rtc module . (I test with pin20/21 and sparkfun I2C converter nothing)

Thanks a lot.

Regards.

[Rob F]

Hello oco89, you need connect the SCL/SDA pin on the RTC to SCL1 and SDA1 on the Due not pin 20/21, also there are 2 resistors on the RTC you need to remove. You can see those in the image.

   

[oco89]

Hi, thanks a lot for this quick answer , but i can't plug directly the scl/sda line directly on the due if i have 5vdc power!! i have not your display pcb i would make an generale test . could you explaine me how interfacing this rtc to the due. thanks.

Regards.

and congratulation for this work..

[Rob F]

That's right but when you remove those 2 resistors on the RTC it becomes 3.3v instead of 5v. Power up your RTC, check voltages on SCL and SDA, it should be 5v, remove those resistors, check again and it should be 3.3v. Then connect SCL to SCL1 and SDA to SDA1 on the Due.

On the Due, SCL and SCL1 work different, you have to use SCL1 and SDA1 on Due.

[oco89]

ok thanks a lot good night.

regards

[Rob F]

No problem, have a good night as well.