Hello everyone, I am trying to connect multiple VL53L5CX-SATEL sensors. I already managed to connect 3 sensors but when I add the fourth I lose tension in the SCL pin.

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ST Employee

It's a far too common problem, and it has nothing to do with what sensors you put on the I2C bus.

One has to size the pull-up on the SDA and SCL lines based on the number of sensors and the capacitance of the wire. And it's a real pain.

But NXP (who bought Philips) maintains a pretty good bit of documentation.

I think it's section 7 that explains the math to figure out what size pull-up you need.

Your MCU board manufacturer chose a value that's apparently good for 3 sensors, but after that, you need a bigger pullup.

Cheers,

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