The I2C is not needed. The internal pullups can be disabled in the code. We did it with Si5351 and before that with Si570 and other chips. Just the 2.2K resistors to 3.3v are enough.
On Sun 29 Mar, 2020, 3:23 AM Bob WO6W, <
bobhome@...> wrote:
OK¡ I¡¯ll merge our work¡
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In particular, I2C level translation if not already in yours¡
?
Right angle RCA¡ Just created this:
?
?
Here¡¯s my schematic¡
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From: [email protected] [mailto:[email protected]] On Behalf Of Ashhar Farhan
Sent: Saturday, March 28, 2020 2:46 PM
To: [email protected]
Subject: [VentilatorDevelopers] First look, PCB
?
Bob, Gordon and Gang,
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I have uploaded the schematic and its corresponding PCB layout. It has the following issues to be resolved.
1. I couldnt?find the footprint (the physical?shapes library) of the RCA connector. Instead, I have used relimate connectors?for everything. We will replace them later.
2. I coudln't find 20x4 footprint?either. so I have bunged in a 16x2 display?for the time being. Both use the same pin connector but they have different mourning?holes.
3. The Alternative TFT display's?mounting holes haven't been added either.
4. All the connectors going to the ventilator controls is to the right of the board, through relimate connectors. We could elect to go with relimate connectos?alone. However, I would like to use 3 pin connectors for the relay and 2 pin connectors for the solenoid so that one doesn't plug into the other connector.
If someone can work at getting the 20x4 and the RCA right angle connector footprints?out while I sleep, that would be great!?
