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Krazzy7434
Joined: 21 Aug 2014
Posts: 39
Location: India
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| Confused with Jhd 629-204a m12 LCD display.. |
 Posted: Tue Dec 23, 2014 1:29 am |
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Hello friends....
I bought a new lcd display...its jhd629-2042 m12....
The problem is its a 32 pin lcd display and i cant find any datasheet for it...
i have worked with 16 pin 20x4 lcd before...but this is 20x4 32 pin lcd display...
Need serious help guys....
Thank You
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Krazzy7434 |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Tue Dec 23, 2014 1:43 am |
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Is this it ?
http://www.jhdlcd.com.cn/204character/25-24.html
I think it's best to only buy a display if you are pretty sure you can
get or make a driver for it. Don't buy random lcd displays.
But anyway, that lcd uses the KS0066 which should work OK with
the 20x4 flex lcd driver in the CCS code library forum. |
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Krazzy7434
Joined: 21 Aug 2014
Posts: 39
Location: India
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| Posted: Tue Dec 23, 2014 2:01 am |
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| PCM programmer wrote: | Is this it ?
http://www.jhdlcd.com.cn/204character/25-24.html
I think it's best to only buy a display if you are pretty sure you can
get or make a driver for it. Don't buy random lcd displays.
But anyway, that lcd uses the KS0066 which should work OK with
the 20x4 flex lcd driver in the CCS code library forum. |
Yes..its the Same...But i dont know any thing about the 32 pins...
how to make the connection...???
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Krazzy7434 |
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Ttelmah
Joined: 11 Mar 2010
Posts: 19510
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| Posted: Tue Dec 23, 2014 2:18 am |
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Are you sure it has 32pins, not just a 32pin connector, with the second row doing nothing?. I've had quite a few displays made for customers in 'noisy' environments, where they use a double row connector, and have the second row grounded, and use 'twist and flat' cable.
There is a partial data sheet linked to on the site PCM_Programmer pointed to, and a slightly better one at:
<www.electronicaestudio.com/docs/JHD204ASERIES.pdf>
None are shown as having 32pins.
There is a contrast issue on some of these displays:
<http://www.wabbitwanch.net/blog/?p=972>
Last edited by Ttelmah on Tue Dec 23, 2014 3:41 am; edited 1 time in total |
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Krazzy7434
Joined: 21 Aug 2014
Posts: 39
Location: India
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| Posted: Tue Dec 23, 2014 3:40 am |
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| Ttelmah wrote: | Are you sure it has 32pins, not just a 32pin connector, with the second row doing nothing?.
There is a partial data sheet linked to on the site PCM_Programmer pointed to, and a slightly better one at:
<www.electronicaestudio.com/docs/JHD204ASERIES.pdf>
None are shown as having 32pins.
There is a contrast issue on some of these displays:
<http://www.wabbitwanch.net/blog/?p=972> |
hi ttelmah..
Yes , there is 32 pins.....
its looks similar to the one showed by Pcm...Look at the Picture in...
http://www.jhdlcd.com.cn/204character/25-24.html
There is 16 pins on the top of the display and 16 pins on the bottom of the display.....
Thank You..
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Krazzy7434 |
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Ttelmah
Joined: 11 Mar 2010
Posts: 19510
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| Posted: Tue Dec 23, 2014 4:09 am |
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If you look at the datasheet attached to that display, they just ignore the bottom connector.
If you look at the backside tracking (blow up the image in the advertisement), the tracking has the pin connections linking directly from one connector to the other. So you can use either connector, according to which is more convenient. |
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Krazzy7434
Joined: 21 Aug 2014
Posts: 39
Location: India
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| Posted: Wed Dec 24, 2014 5:13 am |
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| Ttelmah wrote: | If you look at the datasheet attached to that display, they just ignore the bottom connector.
If you look at the backside tracking (blow up the image in the advertisement), the tracking has the pin connections linking directly from one connector to the other. So you can use either connector, according to which is more convenient. |
Hi Ttelmah...
i did as u have said...i ignored the bottom connector and it now working very well..... 
But now i have a another problem...its working with 2x16 driver but not with 4x20 driver .....with 2x16 driver i can only use first two line of the display.....
when 4x20 drivers are used ,it shows dark squares on the first and third lines of the display....
plz help me guys........
Thank you
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Krazzy7434 |
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Krazzy7434
Joined: 21 Aug 2014
Posts: 39
Location: India
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| Posted: Sat Dec 27, 2014 12:37 am |
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Hello guys.....
actually there is no problem with driver, i have specified the pin wrongly in the driver,,,...
Now every thing is working fine....
Thank you guys.
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Krazzy7434 |
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