03-16-2020, 08:18 AM
(03-13-2020, 12:37 PM)zaius Wrote:(03-11-2020, 02:41 PM)danielt Wrote: 3.3v adapters could cause touble (IIRC 3.3v is, strictly speaking, slightly over-volted too... but hopefully it is within engineering tolerances). However if they do cause trouble why are we not getting failure reports for that?
Maybe they using a different chipset?
"When serial interface output is free, the TXD in CH340H and CH340T is high level, TXD in CH340R is low-level."
https://cdn.sparkfun.com/datasheets/Dev/...340DS1.PDF
CH340R is a special case part designed to reduce part counts by eliminating the need for any external inverting buffer when interfacing with a system that does not idle at logic 1 (IrDA for example). Connecting this part to a device that does idle at logic 1 would make no sense and and when is doesn't work it would certainly not be due to any fault in the PBP.
