Author Topic: NHD-0420D3Z - Display siezing up  (Read 1647 times)

ceb4

  • Newbie
  • *
  • Posts: 2
  • Karma: 0
    • View Profile
NHD-0420D3Z - Display siezing up
« on: May 02, 2016, 10:01:13 AM »
I am interfacing the NHD-0420D3Z using I2C and a Raspberry Pi model 2. I have put a P82B96 (at +5) between the NHD and Pi to keep the levels at the 0/+5 as the specs call for since I noticed spikes on the SDA above 3.3 when it was directly connected to the Pi. Using a PSO, I am monitoring both sides of the P82B86 to observe both the 3.3 and 5 volt levels. The issue I am having is that a random times (5 minutes to 12 hours) the NHD seizes both the SCL and SDA lines driving them to 0. This is also occurred when I was driving the NHD directly from the Pi. Once seized, the Pi is still pumping out I2C data but the NHD controls both I2C lines and keeps them a zero with the NHD displaying the frozen data. Removing the power and reconnecting it resolves the problem until the next seize. This appears to be a timing issue since another application using a RCM3750 works fine. Anyone have any idea what events would cause the NHD to react this way? I have eliminated the NHD since I have duplicated this problem on multiple NHD's. Thanks in advance.

 

Blank Display on NHD‐C0220BiZ‐FS(RGB)‐FBW‐3VM

Started by SteveCBoard Character LCDs

Replies: 3
Views: 4553
Last post May 13, 2014, 12:04:36 AM
by SteveC
NHD‐C12864A1Z‐FSW‐FBW‐HTT display clears after draw

Started by EdAverillBoard Graphic LCDs

Replies: 6
Views: 5684
Last post November 07, 2014, 08:25:20 AM
by Michael_L
NHD‐4.3‐480272EF‐ATXL#‐CTP | FAN5333 | BBB | Nothing on the Display

Started by Alias_AliasBoard TFTs

Replies: 1
Views: 3392
Last post September 25, 2015, 03:09:24 PM
by Paul_B
Arduino LCD library not working with newhaven display NHD‐0420H1Z‐FL‐GWB-3V3

Started by c2hollowBoard Character LCDs

Replies: 9
Views: 8790
Last post July 10, 2014, 08:46:06 AM
by Michael_L
NHD-0420DZW-AG5 - Display "sometimes" shows only 2 lines

Started by stylonurusBoard OLEDs

Replies: 5
Views: 5566
Last post June 18, 2014, 10:09:49 AM
by Michael_L