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VGA Voltage level

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Asher Kim's picture
Asher Kim
Junior(0)
VGA Voltage level

Hi~
 
I would like to know VGA Voltage level. 
(at VGA-HS, VGA-VS, I2C SDA, I2C SCL)
 
In case of ZED, it is designed by 3.3V level.
(at VGA-HS, VGA-VS)
 
Is it generally 3.3V level or 5V level?
(at VGA-HS, VGA-VS, I2C SDA, I2C SCL)
 
Thanks you. 

fletch's picture
fletch
Moderator(17)
I do not see any I2C SDA or

I do not see any I2C SDA or SCL related to VGA on ZedBoard.

 

Regarding the VGA syncs, I read that these are 5V TTL signals. However, as long as the Voh > 2.7V, the voltage level is acceptable.

 

http://www.pyroelectro.com/tutorials/fpga_vga_resistor_dac/theory.html

https://www.linusakesson.net/hardware/beagleboard/vga.php

https://learn.sparkfun.com/tutorials/logic-levels/ttl-logic-levels

 

Regarding the color signals themselves, they have a 1.0V maximum.

 

Bryan

Asher Kim's picture
Asher Kim
Junior(0)
Hi, Bryan

Hi, Bryan
Thank you for help.
 
I didn't see I2C SDA or SCL related to VGA on ZedBoard, too.
Regarding the I2C SDA and SCL, I saw this at below link(wiki).
https://en.wikipedia.org/wiki/VGA_connector
 
Thanks again.
 
Best Regards,
Asher

fletch's picture
fletch
Moderator(17)
I can confirm that the SDA

I can confirm that the SDA (Pin 12) and SCL (Pin 15) on ZedBoard are No Connect. However, in reading elsewhere online, I see "The VESA E-DDC specification specifies use of I2C at +5V.

Bryan