LCD & LCD-MOD Details, Specs, Installation

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.

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.

Sources. I don't know which was first, but it's all effectively the same info:

X-S Thread - Aladdin LCD?
X-S Thread w/ pix - Aladdin XT LCD Working Elitely
AXT 4064 with LCD in action!
CFAH2004A-YMC-JP LCD Data Sheet

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! :)

LCD-MOD	CFAH2004A-YMC-JP	Description
GND	Vss	Ground
VDD	Vdd	5V Power *
VEE	Vo	Contrast/Operating Voltage
RS	RS	Register Selector
R/W	R/W	Read/Write
E	E	Chip Enable Signal
D4	DB4	Data Bit 4
D5	DB5	Data Bit 5
D6	DB6	Data Bit 6
D7	DB7	Data Bit 7
LEDA	A	LED+ (Backlight Only)
LEDK	K	LED- (Backlight Only)

* 5V power note - A wire needs to be soldered for this. This link shows where to get 5v from your mobo (http://www.xaddons.com/index.php?templateid=products&product=diagram_lcdmod_aadv):

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:

Resistor = (5V - forward voltage drop)/current

the backlight voltage drop and normal operating current can be found in the 
datasheet for your display. eg if voltage drop was 3.6V and you wanted 70mA
of current

Resistor = (5V - 3.6V) / 0.07A = 20 Ohm
***just an example, use your own values here!***

For my CFAH2004A-YMC-JP LCD, here are the backlight specs found in its PDF manual:

Current = 280mA - 560mA
Voltage = 4.2V - 4.6V

..And the calculation is:

Typical (280mA): (5V - 4.2V) / 0.28A = 2.85714286 Ohm
Max (560mA): (5V - 4.2V) / 0.56A = 1.42857143 Ohm

So we need a resistor between 1.42 Ohm and 2.85 Ohm. To be safe, I'm going to start with a 2.85 Ohm. Unfortunately this is out of the range of the POT on the LCD-MOD, which supports 4.7 Ohm - 104.7 Ohm. So, I had to purchase a seperate resistor.

Here's a mirror from the docs for the LCD-MOD which shows details:

Compleded Pictures

The LCD is installed and works perfectly. It should be brighter, however.