Author Topic: NHD-0240CW-AR3 runs very hot with 5V supply  (Read 4247 times)

ElfShotTheFood

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NHD-0240CW-AR3 runs very hot with 5V supply
« on: March 16, 2015, 11:05:42 PM »
I have a new NHD-0240CW-AR3.  I soldered header pins in place, and using my breadboard I grounded pin 1 and applied 5V to pin 3.  I wanted to see what kind of current draw the display has, and since I'll be using SPI mode, I grounded pins 4-6, 10-14, and 17-19.  All remaining pins were left unconnected for the experiment.  Within 10 or 15 seconds I noticed that the right end of the display (with the flex-circuit cable) was hot to the touch. 

I checked the current draw and it measured 180mA (with no other activity).  This seemed high to me, so I left pin 1 grounded, disconnected pin 3, and applied 2.8V to pin 2.  This time, I measured < 10mA (smaller than the measurement capability of the power supply).

I haven't yet tried actually interfacing to the display; I want to make sure it isn't damaged or defective before proceeding.

Thanks for any ideas on this!

Retheesh_M

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Re: NHD-0240CW-AR3 runs very hot with 5V supply
« Reply #1 on: March 17, 2015, 04:13:41 PM »
We have tested the display and have confirmed the issue.  When a voltage is applied to pin 3 the display increases in temperature around the area of the flex cable.  We also conducted a multitude of tests with either 5V or 2.8V on pin 2 and ran the board for hours without any issues.  We also tried both 5V and 3.3V logic and neither remedied the problem.  We will look into this further and update the specifications accordingly. 

ElfShotTheFood

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Re: NHD-0240CW-AR3 runs very hot with 5V supply
« Reply #2 on: March 17, 2015, 08:52:17 PM »
Thank you very much for the information.  I will go ahead with the project and see how things run.  If the extra heat is a problem, I will try adding level shifters for the serial lines and run the display from 2.8V.

Thanks again!


sigitronic

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Bad error in datasheet! NHD-0240CW runs very hot with 5V supply!
« Reply #3 on: March 27, 2015, 05:23:38 AM »
Hello all
It tooks me several days to find a error in the NHD-0216CW datasheet! When the display is connected according  datasheet (Pin1 = Ground; Pin2 = no connection; Pin3 = 5V) my display runs hot as many of you described too. I impelemented the interface very accurate to meet all the specs of timing and pin configuration. No way to bring something onto the display, neither in Parallel  8-bit 6800 nor in SPI-mode.
After switching to the 2.8V configuration according datasheet, both configutations worked well.  (Pin1 = Ground; Pin2 = 3.3V; Pin3 = GND)  But I need a 5V display in my project an therefore I tried someting which is forbidden expelcitly by the datasheet:  (Pin1 = Ground; Pin2 = 5V; Pin3 = 5V) and now everytheing works fine! I still have a strange feeling to go into serial with this finding. Please confirm that this configuration is safe to use.

best regards
Matthias
 

Paul_B

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Re: NHD-0240CW-AR3 runs very hot with 5V supply
« Reply #4 on: April 06, 2015, 10:24:48 AM »
Hello,

We have verified the correct configuration for 5V operation, please see the table attached. The updated spec will be available later today, I apologize for the inconvenience.

Thanks.


sigitronic

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Re: NHD-0240CW-AR3 runs very hot with 5V supply
« Reply #5 on: April 06, 2015, 10:54:25 AM »
Thanks a lot! Please change it also in the datasheet. (it may be of interest for others too.)
regards
Matthias

Paul_B

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Re: NHD-0240CW-AR3 runs very hot with 5V supply
« Reply #6 on: April 06, 2015, 11:53:25 AM »
No problem, I am updating the datasheet as we speak.

Have a good one!

sigitronic

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Re: NHD-0240CW-AR3 runs very hot with 5V supply
« Reply #7 on: April 15, 2015, 07:08:09 AM »
Hello Paul
Thanks for updating most of the datasheets.
In two of them, unfortunatly the error remains:
NHD‐0216CW‐AB3 and NHD‐0216CW‐AR3
(The top two most favorite colours of mankind)
regards, Matthias

Paul_B

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Re: NHD-0240CW-AR3 runs very hot with 5V supply
« Reply #8 on: April 15, 2015, 09:40:16 AM »
Hey Matthias,

NHD‐0216CW‐AB3 and NHD‐0216CW‐AR3 will be updated shortly  :)

Paul_B

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Re: NHD-0240CW-AR3 runs very hot with 5V supply
« Reply #9 on: April 15, 2015, 10:19:50 AM »
The specs have been updated. Please clear your browsing history and load again to view the updated datasheets.  8)

Thanks!

sigitronic

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Re: NHD-0240CW-AR3 runs very hot with 5V supply
« Reply #10 on: April 16, 2015, 05:00:20 AM »
mea culpa!
Thanks

 

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