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> LCD Batron
MaxT2000
Posted: October 06, 2002 01:07 am
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Hi all,
Ive got a 4 x 20 LCD but can not get it to go, it is new.
According to the data sheet all the connections are standard.
Can anyone shed light on this?
The LCD is a Batron BT42005 and connected on a 4 bit bus
and a single 5v supply
???
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DutchDork
Posted: October 06, 2002 07:19 pm
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Hi,

Since you didn't provide us with much information, my only guess for now is that the power supply is less than 4.5V and the LCD controller is still in power on reset. (Look at page 8 and 9 of the SPLC780A1 LCD controller datasheet). Could you give us some more information?
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MaxT2000
Posted: October 09, 2002 05:07 pm
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Hi, Thanks for your reply,
The LCD is a 4 line by 20 character module, all my other LCDs work ok.
I am using a PIC16F877, and Crownhill Pic Basic Plus v 1.29b.
LCD info…
Type Batron BT42005
Pin
1   Vss 5v as per data sheet
2   vdd
3   vo lcd drive / contrast Max 12v
4   rs
5   r/w
6   e
7-14   data bus

If all LCDs require a power on reset then Pic Basic Plus takes care of this.
Thank for your help, if you require more info please specify.

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DutchDork
Posted: October 09, 2002 08:12 pm
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Well... In case this is not a typo.. wink.gif
[quote author=MaxT2000 link=board=13;threadid=135;start=0#1031 date=1034179647]
Pin
1 Vss 5v as per data sheet
2 vdd
[/quote]
should be
pin
1 Vss
2 vdd 5v as per data sheet

[quote author=MaxT2000 link=board=13;threadid=135;start=0#1031 date=1034179647]
If all LCDs require a power on reset then Pic Basic Plus takes care of this.
[/quote]

When the power is below 4.5V, the LCD controller stays in power-on reset, so your PIC-controller can't communicate with the LCD controller and your display won't work. Even your Pic Basic Plus can't do anything about this.

Also take a good look at pag 9 of the SPLC780A1 LCD controller datasheet. It shows you that after initialisation the display is still off. You can enable it by setting bit DB2 of de "Display On/Off Control" register.

If you can't get the display to work, then I think there's something wrong with the sourcecode of your PIC-controller. Maybee we should take a look and see if we can find the problem...
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MaxT2000
Posted: December 01, 2002 06:23 pm
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When using a display made by Powertip
all works fine,
A Powertip display uses a single 5v supply
contrast is controld by a VR conected to - & +
and the controle pin

late reply by me, but thanks smile.gif
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end1roy
Posted: April 07, 2012 04:23 am
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QUOTE (DutchDork @ October 06, 2002 07:19 pm)
Hi,

Since you didn't provide us with much information, my only guess for now is that the power supply is less than 4.5V and the led lights controller is still in power on reset. (Look at page 8 and 9 of the SPLC780A1 LCD controller datasheet). Could you give us some more information?

sir..


if the power supply is more than 4.5v in LCD is it still works?
and the LCD can convert to touchscreen???

thanks.... and I need some data... thumbsup.gif biggrin.gif

This post has been edited by end1roy on April 08, 2012 12:37 pm
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shweta
Posted: April 10, 2012 01:00 pm
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QUOTE (MaxT2000 @ October 06, 2002 05:07 am)
Hi all,
Ive got a 4 x 20 LCD but can not get it to go, it is new.
According to the data sheet all the connections are standard.
Can anyone shed light on this?
The LCD is a Batron BT42005 and connected on a 4 bit bus
and a single 5v supply
???

In the data sheet of BT42005 LCD....its said that the controller inside the BT42005 LCD Display is compatible with SPLC780 lcd controller/driver.

So for further details like how to get cursor, characters and more....you need to go through the manual of above controller.

for data sheet check out the link

http://www.lcd-china.com/products/characte.../ic/SPLC780.pdf

This post has been edited by shweta on April 10, 2012 01:00 pm
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Geek
Posted: April 10, 2012 01:43 pm
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Ten year old thread guys. It's done.


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-= Gregg =-
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(please do not PM me for advice. Non-forum business messages will be ignored)
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