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

The RTC Pi is a Real-time clock for the Raspberry Pi

29/11/2016

Posted by:
yumi

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's the datasheet for the DS1307 RTC.

report

29/11/2016

Posted by:
andrew

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.

report

03/06/2020

Posted by:
meihao

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

report

RTC Pi V1 resets itself when the board is unplugged.

RTC Pi and Orange Pi Zero 2: I2C Activation

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

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