Max (560mA): (5V - 4.2V) / 0.56A = 1.42857143 Ohm
Typical (280mA): (5V - 4.2V) / 0.28A = 2.85714286 Ohm
For my CFAH2004A-YMC-JP LCD, here are the backlight specs found in its PDF manual:
***just an example, use your own values here!***
Resistor = (5V - 3.6V) / 0.07A = 20 Ohm
datasheet for your display. eg if voltage drop was 3.6V and you wanted 70mA
the backlight voltage drop and normal operating current can be found in the
Resistor = (5V - forward voltage drop)/current
Before you wire everything up, my LCD has a backlight so some calculations must be done to know what resistance to set. According to one of the sources above, the calculation is this. Here's a quote from one of the forum posts above:
* 5V power note - A wire needs to be soldered for this. This link shows where to get 5v from your mobo ( ):
Here are the pinouts. They're nearly 1:1 in order, so it's nice and simple. The CFAH2004A-YMC-JP supports either a 4 or 8-bit bus, so my assumption is that DB0 - DB3 are if you are using 8-bit, and DB4 - DB7 are for 4-bit. As I said earlier, I dont know a ton about this stuff, but that makes sense to me! :)
Sources. I don't know which was first, but it's all effectively the same info:
The info I found was speaking of the Aladdin XT chip that has a parallel bus built in, but it's the same as the LCD-MOD pinouts, pretty much.
It was a bit difficult to find the proper information, so I'll put the sources and the info I have here all in one spot.
Posted April 3rd, 2006 by falz
LCD & LCD-MOD Details, Specs, Installation
Yes - and I'm a fucking retard because of it
Maybe - can't decide because I'm retarded
No - they're fucking retarded
LCD & LCD-MOD Details, Specs, Installation | falz.net
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