Whoops! All the similar sounding part numbers got me mixed up!
On Sunday, November 1, 2015 5:58 PM, Luka C <luka.culic.visk...@gmail.com>
wrote:
@Spencer
Indeed that probably was the case with your clock because the HV5222 has OE
that can either turn all the outputs LOW or push the data from the shift
register to them from what I saw in the datasheet, but HV5622 has no such
function, the only thing it has is LE (latch) and BL (blank). Correct me if I'm
wrong.
Dana nedjelja, 1. studenoga 2015. u 23:44:37 UTC+1, korisnik Spencer napisao je:
I had the same issue with the HV522PJ (which I believe is the same chip but
just shifts counter clockwise) with flickering when updating the display.
I found I had to pull OE LOW when updating and HIGH when finished.
Sent from my Verizon Wireless 4G LTE smartphone
-------- Original message --------
From: Luka C <luka.culi...@gmail.com>
Date: 11/01/2015 1:12 PM (GMT-06:00)
To: neonixie-l <neoni...@googlegroups.com>
Subject: [neonixie-l] Help with HV5622 drivers
Hi everyone,
I have made a prototype of my nixie clock using HV5622 nixie drivers, 2 of them
chaned (DATAOUT of first one connected to DATAIN of the second one). They're
both clocked trough the same pulse and also both latched trough the same pulse.
The problem I'm dealing with now is the appearance of random numbers while the
data shifts to the register at higher speeds, please take a look here:
https://youtu.be/QHljLFrYjss .
The video was slowed down 50% for you to actually see these glithces.
Now, this is an extremely annoying problem when I do a code that looks like:
void loop
{
FreezeLatch();
ShiftDataToHV5622(x, y, z, q);
ShiftDataToHV5622(x, y, z, q);
UnfreezeLatch();
}
if I add a delay of >100ms
void loop
{
FreezeLatch();
ShiftDataToHV5622(x, y, z, q);
ShiftDataToHV5622(x, y, z, q);
UnfreezeLatch();
delay(100);
}
x, y, z, q - bytes of data
Then I have a situation where the occurrence appears to be pretty rare. Also,
if I do both shifts once and don't loop it, it either makes the glitch and
stays that way or it doesn't and tubes continue to display normal digits.
Now, for me it pretty much seems to be a problem in which data is incorrectly
placed inside the shift registers of HV5622 quite randomly and it causes the
outputs of the HV5622 to connect multiple digits and light them up.
This is how everything is connected:
Now, I guess there could be 2 possible problems:
1.) Level shifters are too slow, I'm this type and it could be too slow (TTL):
http://obrazki.elektroda.pl/ 4179751000_1362756714.png2.) Level shifters output
possibly not compliant with CMOS inputs of the HV5622?
What do you think, what are the possible solutions? An IC level shifter of some
kind?
Anyway, sorry for the longer post here, would be very thankful for any help.
PS. thanks a lot for the previous advice on power supply, it works like a
charm! :)
Luka
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