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Character LCDs / Re: 2x NHD-0420D3Z I2C Problem
« on: July 20, 2016, 09:34:11 PM »
Yes, I've done so and there is again no change in the waveforms. I guess this means that the internal pull-ups on the display's pic16f690 are enabled. I've tried lower termination resistances as well (2Kohm) with no changes. I checked the series resistance on the i2c bus (the resistance of my wiring) and it was about 30 ohms. This seems a little high since the wire (22AWG) should only provide 52 ohms/km and there's only about 1foot of wire.
Could it be that the weak internal pullups are too low value and are dragging the pullup resistance way down?
Could it be that the weak internal pullups are too low value and are dragging the pullup resistance way down?