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How to modify DS1307 RTC to use 3.3V for Raspberry Pi?

4418 Views - Created 29/11/2016


Posted by:

yumi Avatar

I bought DS1307 RTC but it is 5V so it can't be connected to the Pi. I know it can be modified to use 3.3V by removing 2 resistors. This sensor is different than the adafruit kit so I am not sure which resistors to remove. It also has 2 sets of pins. What are the extra pins for and which should I use and which pins do I remove?Here is the image of the RTC:forum imageHere's the datasheet for the DS1307 RTC.


Posted by:

andrew Avatar

United Kingdom

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Without a schematic for the RTC module, it is difficult to know which resistors need to be removed.

On our RTC Pi boards, we use a mosfet-based level shifter to convert the 5V I2C bus on the DS1307 to 3.3V on the Raspberry Pi.


Posted by:

meihao Avatar

I happened to see your post, I find DS1307 on Jotrin Electronics Limited, for your question about: What are the extra pins for and which should I use and which pins do I remove? I think maybe you can turn to their engineers

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