Try both
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Try both
Steve
It's not a bug, it's a random feature.
There's no problem, only learning opportunities.
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I2C bus waveforms
Mr. E (or anyone <grin>-
What is the 'best' way to bus these 23016s off board? I will have 8 of these devices on their own I/O board and looking at the waveforms on 3 of them - the multi-ground cable may not be the best solution.
The leading edge of the waveform rounds off to the falling edge of the pulse. The cable I have selected is instrument-grade but without a foil shield. I am sending +5 with the 2 signals but I do have 3 ground wires and the twist in the cable should have been good enough for the 1 foot of cable between the 8 boards.
The proc is in the middle and 4 boards go out from the left and right.
Should I use a schmidt buffer?
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From 4.7k to 2.2k pullups
I changed the pullups to 2.2k based on the graph in the I2C specs of 2000. I believe since I am using all MCP23016s and they are 'fast' devices, I should be fine.
The waveforms have a bit of roll-off on the leading edge but look better.
Has anyone used the switched pull up circuit from this refrence?
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