I/O Board

https://github.com/MiSTer-devel/Main_MiSTer/wiki

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Sorgelig
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Re: I/O Board

Postby Sorgelig » Mon Jun 11, 2018 4:57 pm

Note:
for new GPIO connector functioning, you need to solder pins in P7 connector. If you use 2x20 header with long pins, then you can use cut pins as pins for P7 header.

20180612_005804.jpg
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THaase
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Re: I/O Board

Postby THaase » Tue Jun 12, 2018 8:37 am

Dear Sorgelig,

at the moment I'm preparing a new batch of 5.2 boards (SMD parts are mostly soldered), but I've already ordered all (more or less) parts for the new 5.5 - so next batch after will be based on 5.5 (until there will be nothing newer when I'm ordering :D ).

Some short question:
- LED4 is similar to LED1? (I guess yes)
- Any hint for the USB3.0? (LCSC doesn't have the right ones as far as I can see - and Digikey is quite expensive (1.73€ for a USB3 connector is not cheap I think :-) )
Edit: Does this fit?
Type 1
or
Type 2
Thanks a lot for your great work!

Sorgelig
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Re: I/O Board

Postby Sorgelig » Tue Jun 12, 2018 9:34 am

THaase wrote:- LED4 is similar to LED1? (I guess yes)

I'm using the same as LED1.
LED1 may be both 3mm and 5mm. LED4 is supposed to be a 3mm LED (may be 5mm will fit as well - i didn't test). Make sure it's bright enough to make TOSLink work. Would be better if you will try it first. I cannot give an exact part number as i'm using no-name LEDs i've ordered in big bucket of many colors from Aliexpress long time ago.
I believe any red LED with 90mcd and up should work.

THaase wrote:Edit: Does this fit?
Type 1
or
Type 2

Both are looking compatible. It's surprising that lcsc has no USB3 sockets.

THaase
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Re: I/O Board

Postby THaase » Tue Jun 12, 2018 9:47 am

Thanks for the fast reply.
LCSC has USB3 but nothing 90 degree

THaase
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Re: I/O Board

Postby THaase » Wed Jun 13, 2018 8:19 am

Dear Sorgelig,
sorry to bother you again, but I'm having a 'problem' with the dimension of R32 (Resistor for the SPDIF LED).
In the schematics you say: 200R

And you say:
Sorgelig wrote:I believe any red LED with 90mcd and up should work.


I'm not using the Würth mentioned in the Wiki (that only have 35mcd), but this one from LCSC LED

Mentioned as:340-480mcd@20mA
Forward Voltage is: 2.2V (as usual) if I calculate this with 200R and 3.3 I'm getting 5.5mA ....

For 20mA it should be 56R and for 3mA Leds it should be about 390R ....
For sure its not needed to go for the full 20mA .... but wouldn't a value of 100R (11mA) more suitable?

Thanks for your help.

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cvenditti
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Re: I/O Board

Postby cvenditti » Wed Jun 13, 2018 12:53 pm

THaase wrote:Thanks for the fast reply.
LCSC has USB3 but nothing 90 degree

What about this one:
https://www.aliexpress.com/item/50pcs-U ... autifyAB=0

or

https://www.aliexpress.com/item/30Pcs-H ... autifyAB=0

Cyril

Sorgelig
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Re: I/O Board

Postby Sorgelig » Wed Jun 13, 2018 3:16 pm


they also look compatible.


THaase wrote:I'm not using the Würth mentioned in the Wiki (that only have 35mcd), but this one from LCSC LED

Mentioned as:340-480mcd@20mA
Forward Voltage is: 2.2V (as usual) if I calculate this with 200R and 3.3 I'm getting 5.5mA ....

For 20mA it should be 56R and for 3mA Leds it should be about 390R ....
For sure its not needed to go for the full 20mA .... but wouldn't a value of 100R (11mA) more suitable?

Generally speaking, resistor value depends on used LED. 20mA is too much for FPGA output so, don't expect such current. Use 4mA as a target. 340mcd look insane to me but with 4-5mA it will provide enough light to make TOSLink work.


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