Quote Originally Posted by Darrel Taylor View Post
I don't know what the Microchip bootloader is compatible with.
But the MPS shows these USB parts with 64K or more.



The chips listed that are not supported in PBP 2.60A, will be added in PBP 2.60B.

Note: They are all 3V parts.

Otherwise, you can make your own FT232 equivalent with any USB PIC chip using CDC.
The 13K50 is probably the smallest @ 20 pins, and is 5V.
Thank you Darrel,

thank you indeed, this looks really promising.
It is really nice from you to present such a table.
Where on earth did you find that? (rhetorical question)

I looked for something like that but did not find anything
besides what I already told (18F4620/FT232).

Do you have an Crystal ball?
Can you tell when PBP 2.60B will be released?
Within 3, 6 or 9 months?

There is of course some problems when changing from a 5V processor to a 3V processor when the environment is 5V. However, that is not a big problem when there are enough pins that are 5V tolerant that can work directly with other 5V circuits.

But on the other hand, I have not done that before,
could you please give some good advice how to do it?
Using two regulators one 3V and one 5V? The 3V reg could be small, something 500mA or even less, maybe just 100mA.
Using only 5V and a Zener diode (very old way of thinking)?
Or maybe some other approach?

Everyone in that list has enough program memory (64k or more) and a RTCC. Meaning that I can discard the I2C RTC and freeing such area of the board, nice. And changing the LCD to an I2C device (Melabs Serial LCD. Is it goog?) there is a possibility to choose 18F26J50 that is a only 28 pin device, so the board is not so populated any more as it is at the moment. Very promising indeed