Author Topic: NHD-0216K1Z-FL-YBW grounding pad  (Read 416 times)

jdavila

  • Newbie
  • *
  • Posts: 2
  • Karma: 0
    • View Profile
NHD-0216K1Z-FL-YBW grounding pad
« on: October 06, 2016, 10:19:45 AM »
Hello,
I'm using one of your LCDs on a new design,Part Number NHD-0216K1Z-FL-YBW.

In this particular design, i need to avoid ground loops through the mounting holes, i have seen that this PN has a copper trace that goes from one mounting hole pad to another pad labeled as "JFL"
on the back side of lcd, inside a silkscreen box labeled "K3", this box contains another pad labeled "JF" too.

I think these pads lets you select between connect the display metal frame to the physical ground(mounting hole pad) and the display's reference ground(PIN1 on CON1).

Could you please confirm that i had to cut this copper trace to effectively isolate display from ground?

Do you have any information regarding the "JFL" & "JF" pads and what functionality do they offer?

Best Regards
Jesus
« Last Edit: October 06, 2016, 10:21:30 AM by jdavila »

jdavila

  • Newbie
  • *
  • Posts: 2
  • Karma: 0
    • View Profile
Re: NHD-0216K1Z-FL-YBW grounding pad
« Reply #1 on: October 06, 2016, 10:27:55 AM »
Please ignore, I have already received the information i need by mail from Saurabh Baxi | Applications Engineer
Thanks a lot for your kind support.

abb

  • Newbie
  • *
  • Posts: 1
  • Karma: 0
    • View Profile
Re: NHD-0216K1Z-FL-YBW grounding pad
« Reply #2 on: December 09, 2016, 04:41:17 PM »
I'm curious what the resolution here was. We use a different part (NHD-0420DZW-AB5), but it has similar connections and components. It appears JHG connects the display metal frame to the mounting hole chassis ground through a 0 Ohm resistor, and then JFG connects the chassis ground to the digital ground through a 100 kOhm resistor.

The same basic questions apply. Can JFG be eliminated or perhaps increased to a 1 MOhm resistor?

EDIT: Or, alternatively, can JHG be removed? Which would be most recommended?
« Last Edit: December 09, 2016, 04:43:33 PM by abb »

Saurabh_B

  • Administrator
  • Sr. Member
  • *****
  • Posts: 290
  • Karma: 10
    • View Profile
Re: NHD-0216K1Z-FL-YBW grounding pad
« Reply #3 on: December 12, 2016, 08:13:09 AM »
Hello, Here's the reply I gave:

As the display is without having those jumpers populated pin 1 on the connectors is not linked to the mounting holes.
You wouldn’t need to cut the trace so long as the JFL remains unpopulated.

The first pad is connected to the mounting hole located on the bottom left of the picture below.
The second pad (K3) is connected to the plate for the Bezel Tabs.
The final pad (JF) is connected to the ground of the display. (Pin 1 on both CON and CON1)

 

CGRAM,DDRAM in 2x16 Character LCD - NHD-0216K1Z-FSW-FBW-L

Started by pradeepsysargusBoard Character LCDs

Replies: 1
Views: 1658
Last post June 24, 2016, 11:37:16 AM
by Ted_M
NHD-0216K1Z-FL-YBW Screen Corruption Problem

Started by ScorpionTechBoard Character LCDs

Replies: 1
Views: 210
Last post January 17, 2017, 12:13:51 PM
by Saurabh_B
MOVED: Problem of contrast NHD-0216K1Z-NSW-BBW-L

Started by Saurabh_BBoard Graphic LCDs

Replies: 0
Views: 187
Last post January 24, 2017, 08:36:08 AM
by Saurabh_B
Problem of contrast NHD-0216K1Z-NSW-BBW-L

Started by vincentthiventBoard Character LCDs

Replies: 1
Views: 186
Last post January 24, 2017, 02:51:57 PM
by Saurabh_B
NHD-0216K1Z-NSW-BBW-L Back light

Started by tkraus@cnmcco.comBoard Character LCDs

Replies: 1
Views: 168
Last post February 13, 2017, 10:42:43 AM
by Saurabh_B