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Topics - danbujak

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Character LCDs / NHD-C0216CIZ Not Acknowledging
« on: January 22, 2015, 02:33:14 PM »
I have 2 identical boards with the same hardware and same firmware I received back from PCB assembly house. They both pass electrical testing, yet the LCD display wont work on one and it will work on the other. I've tried playing around with the pull-ups, the timing, etc. but the one refuses to ACK. Please let me know what I can try to debug this.

10kOhm pull ups
20kHz I2C speed

I've attached a capture of the waveform and two scope captures.

Bad Part NACKing address:
http://i.imgur.com/CmqhVA3.jpg

Good Part ACKing random command:
http://i.imgur.com/jjQJOza.jpg

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