LCD Addon for Beagle.

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21

I'm one of them who read this. Anyway, what is beagle board? Is it a
kind of dog surfing board for beagle?

D.Y.M

22

Also a big problem I have is what to do with the DE line. If I
connect it to the tfp401a like you have in your schematic, the lcd
never turns on. If I connect it to vcc (3.3v) then the lcd turns on
and it works, but I have to connect it while the beagle is in uboot.
If I connect this pin after linux has booted, or just leave it
connected at startup Then the display is very light colored, and
hard to read. Has anyone seen this? Does anyone have hints?

This pin required to be connected if LCD requires it, some thing like data enable or AC enable it dipends on your LCD.
VJ

23

Hi,

Thanks again. The mechanical information in the SRM is exactly what I
want. I apologize for not looking in the SRM before posting.

Any change in placement of J3 w.r.t B7, As I can not find offset of
mounting holes and J3 from right edge of the board in Table 28.

Regards,
VJ

24

I added Dimension A and D from Table 28 together and get 32.39mm,
which is exactly the offset to the center of J3 Pin 27 from the same
reference point on my rev B5 board.

-Preston

25

Ugh, I didn't read your message close enough before replying. The
vertical offset (as pictured in Figure 53) is the same, but the
horizontal offset is not shown for the center of J3 Pin 27, and that
is what you are asking.

-Preston

26

Hm, Yes, I should have been more clear. I am asking what is horizontal
offset of J3 Pin 27

One more thing, J4, J5 neither pin numbers nor signals are in order,
If signals are routed for convenience ( to have minimum number of
layers ) why pin numbers in schematics are given in random order. Does
it fallow physical convention? Is it good to change the pin number in
correct physical order?

Regards,
VJ

27

Hi Gerald,

I am puzzled with the numbering convention of J4 and J5 headers. Does
it fallow physical convention of header? ( PINs in correct physical
order ). I hope that pins are numbered randomly just for convenience
and it fallow standard header convention physically. And it is correct
to import standard 1.27mm header in CAD? i.e

1-2
3-4
4-6
7-8
9-10
11-12
13-14
15-16
17-18
19-20

Regards,
VJ

28

Are the design materials available for this board? Is it possible for
people to buy the pre-assembled board or even just parts (like the
bare PCB)? In general, how do other people get one of these for
themselves?