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Topics - jjbrewer

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Character LCDs / I2C ACK issue
« on: March 18, 2014, 08:14:23 AM »
It was reported on the other forum that the I2C controller bounded to the NHD-C0216CiZ-FSW-FBW-3V3 COG character LCD could only sink 4ma of current.
In order to get a decent waveform with the cable length I am using I have 2.5K pulllups on my PCBA. The COG cannot pull SDA down hard enough for a valid ACK.
Would a NXP PCA9605 2 wire buffer, placed  between the COG and the other devices and cable, help?

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