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An interesting HDMI chip
Posted: Thu Feb 04, 2021 10:46 pm
by Dmian
One of the problems retro computers have is trying to connect them to modern TVs. The standard nowadays is HDMI, a very complicated digital protocol, that’s quite complicated to handle (it was discarded from the X16 for this very reason).
Well, turns out that if you have an RGB signal, there’s a chip that can take that and create and HDMI signal, it’s the CH7035 by Chrontel
http://www.chrontel.com/product/detail/35 If you need to add HDMI output to a project, keep it in mind. I found it really interesting. Hope you find it useful.
An interesting HDMI chip
Posted: Sat Feb 06, 2021 12:28 am
by rje
What's the price per unit?
An interesting HDMI chip
Posted: Sat Feb 06, 2021 6:04 am
by StephenHorn
An interesting HDMI chip
Posted: Fri Mar 19, 2021 8:50 pm
by Wavicle
On 2/4/2021 at 2:46 PM, Dmian said:
One of the problems retro computers have is trying to connect them to modern TVs. The standard nowadays is HDMI, a very complicated digital protocol, that’s quite complicated to handle (it was discarded from the X16 for this very reason).
Well, turns out that if you have an RGB signal, there’s a chip that can take that and create and HDMI signal, it’s the CH7035 by Chrontel
http://www.chrontel.com/product/detail/35 If you need to add HDMI output to a project, keep it in mind. I found it really interesting. Hope you find it useful.
This type of component is commonly called an "HDMI transmitter". For example
this is Analog Devices lineup of HDMI/DVI transmitter products. Any whose input is "pixel bus" will convert digital RGB input. E.g. the ADV7513 takes 8 bits of R, G, and B and encodes them as HDMI. It can also handle I2S audio and encrypt with HDCP (though I'm not clear if it has its own keys or if a manufacturer needs to use their own).
The problem with HDMI is licensing. For low volume manufacturers (less than 10,000 units/year) it is $5,000 annual adopter fee + $1/unit administration + license fee (variable between $0.04 and $0.15/unit, but assume you will always pay 15 cents). For 1,000 units that comes to $6,115 or $6.12/unit for licensing on top of hardware costs. I'm not sure how proactive they are about enforcing the license.