What is the proper length of a I2C flat cable of a temperature sensor probe?

Dear Digital Technology Experts,

I am planning to build a temperature monitor based on a I2C sensor probing hard-to-reach area such as refrigerator interior, ocean terminal container interior, etc.

Then, I have found this cheap China sensor.

Now my question is:

What is the possible maximum length of the probe's flat cable so that I2C data transmission between this temperature probe and the MCU is still kept intact?

Those 4 cables are:

I2C Clock
I2C Data
Voltage input
Ground

Thanks for joining this discussion.

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0 Jan Cumps 1 month ago

Flat cables aren't ideal, but if you keep the 2 data lines at the outsides, and keep the wire away from other wires, you may get a reliable meter or 2 at speeds up to 100 kHz.

Tricks for longer distances: lower speed, lower pull-up resistors, line drivers (with twisted pair balanced data lines), shielding ...
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0 Jan Cumps 1 month ago

Flat cables aren't ideal, but if you keep the 2 data lines at the outsides, and keep the wire away from other wires, you may get a reliable meter or 2 at speeds up to 100 kHz.

Tricks for longer distances: lower speed, lower pull-up resistors, line drivers (with twisted pair balanced data lines), shielding ...
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0 beacon_dave 1 month ago in reply to Jan Cumps

I recall seeing some MAX3816A IC's being used in AV display extenders for the DDC signalling.

https://www.analog.com/en/products/max3816a.html
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